percent water in a hydrate lab answer key

With the Percent Water in a Hydrate: Identification of an Unknown—ChemTopic™ Lab Activity, analyze the percent water in a crystalline hydrate through heating and measurement, and identify it from a list of possible unknowns. Why educators should appear on-screen for instructional videos; Feb. 3, 2021. 0000001208 00000 n S�$D��\ ��k0^{RR5o�|i�V�7Cs��h�6�%�� ;��c��4�((,&�i��"l�PV� experiment 18: formula of a hydrate answer key. Perform calculations by using the molar mass. 3. Introduction: Our group had done 3 data sets for the same experiment process, and had recorded 3 groups of data. 0000002399 00000 n 6. 6) If 125 grams of magnesium sulfate heptahydrate is completely dehydrated, how many grams of anhydrous magnesium sulfate will remain? Are they within 5% of each other? -�{� k�*郑��'�h^D�3L��h�4x��d�?a��i�}�@��H��-LI�jɮ����ñF$7F�7�(�d��@4� Let us look at the big picture... What is a hydrate? Hydrates Worksheet Solutions. startxref 0000000776 00000 n These are called hydrates. 0000016260 00000 n They are crystalline compounds that have a specific number of water molecules trapped within the crystal lattice. 9 24 pre lab "percentage of water in a hydrate" STUDY. 7 benefits of working from home; Jan. 26, 2021. Calculate the percent by mass of water by dividing the mass of H 2 O in 1 mole of the hydrate by the molar mass of the hydrate and multiplying by 100%. Remember not to bring in any new information that you have not already mentioned. xref Complete the folowing and submit your answers as a word document in Canvas. Conclusion: State the percent water and percent duds in the brands you studied. Using your answers from “1” and “5” above calculate the actual number of grams of water present in PRE-LAB ASSIGNMENT one in which a fixed number of water molecules is crystallized with each formula unit. Calculate the percent water in the hydrate sample, using Equation 2 Equation 2 (percent water in a hydrate) percent water, % = (mass of water lost, g/mass of hydrate heated, g) … Gravity. Post-Lab Questions: (about 10% of grade for lab report) (Remember to answer in full sentences. 0000002434 00000 n Background: Hydrates are chemical compounds that contain water as part of their crystal structure. The accepted percentage of water within hydrated copper sulfate is: 36.07%. 0000016465 00000 n x�b```�0V ��A�X��,%30��K,�ɖ��B;:@j��(30(3�3�a��}Cր�Mh��L�U�Y)�Ipm�o�hea`X+�� 5. Step 2: Calculate. Only RFID Journal provides you with the latest insights into what's happening with the technology and standards and inside the operations of leading early adopters across all industries and around the world. Quantity Measured Mass dry beaker 50.00g beaker and contents before heating 60.00 g beaker and contents after first heating 54.96 g beaker and contents after second heating 54.90 g molar mass of anhydrous salt (from teacher) 120.3 g percentage of water in hydrate (from teacher) 51.2 % Text reference: Chapter 7. pp. The actual hydrate formula for the copper (II) sulfate compound was CuSO4+5H2O. The water molecules maintain integrity as molecules, however they are considered to be part of the formula of the hydrate. Determine that all the water has been driven from a hydrate by heating your sample to a constant mass. A 5.0 g sample of a hydrate of BaCl 2 was heated, and only 4.3 g of the anhydrous salt remained. 0000001001 00000 n Calculate the molar mass for your anhydride from the formula provided. xH2O. Name of ... from the hydrate. 6. Divide the mass of water in one mole of the hydrate by the molar mass of the hydrate and multiply this fraction by 100. Example #2: A hydrate of Na 2 CO 3 has a mass of 4.31 g before heating. THIS IS A TEMPLATE FOR YOUR LAB REPORT. Terms in this set (16) hydrate salt. 0 Calculate the percent of water in the hydrate. 4. In this lab we actually calculate the formula of the formula for the hydrate MgSO 4 x H 2 O The “x” is how many waters are attached to each MgSO Mass of water Mass % water in hydrate = x 100 Mass of hydrate 5. It has water molecules loosely attached to it. Hydrates are copper (II) sulfate and copper (II) nitrate. Find the mass of the hydrate CuSO4. Next summarize the conclusion(s) drawn in your discussion. 0000005509 00000 n What percentage of water was in the hydrate? Dividing this number by the original mass will give the percent water in the hydrate. 1) How is a hydrate different from other chemical compounds? t��r�)��ܳ��1XolH �6MR(�}��gc�QsP�� l��Hs�z��7n�ߴNJ+p>9B�� ݞ�쨸��6�XO� ��}d��c��;7��A˗�X*�-�Ȏ�M�G�;e X+]Jʬ�tZ��Zu��Ġ��,eۯ~�d�fw��߃!\��s_]܏�zm�]Rr��au/`��*T�=��@��l�j��װ��6��=�[rp䫂�(�P��p�&)G�"--�&��W�^��F�g��(S=^��U=�{� z��tIW��]K9G��ӤXt��M�~U 0Ǆ��j��"��@S��L�*qe�6�Z�s�n{�u�;M�'��K�s��F�)> ��>�g��VՔmZ7H�"��p�_��1,��k�'��"T~�uG�[��ku�?��Q;68��ǽ@��\�Q�%��㋦�S'xBR@&��Q`�=h1�e�)>�z�,��t�̗`SkjWO3�� ԟf�;�GDC��o�8��)u#�b�\��(H�S�bL͕�B|��Sgs��=��"Lk&٣[~�=z��ԡ-��@'O�Ꙟ��B��m�u�a %��\pd��3Ϥc8Ӯ�~�S�FRGF��;�ބ��a|�5�Î]��z{`��5/�K�u�=�dL��&�%��z�G$];��\'��K��j!ѱ[?�:d�rr�4b�Ŝ�Ҝ]Ŝ�I^�C4��^;��Ƽ�%�v��Q;�ˎ/L\ij-gU�|ƨ� �x� ƣ�{�J��铜��#��^��`�@na�ɩ��OM��DqS��&��yP�N��8ל��l�#��!��O�-��Bٳ��.�р��ƣ�nTk�n�s.��O(��!\�w��@�dk�� claim. Heat can be used to dehydrate a hydrated salt causing the H 2 O molecules to endstream endobj 10 0 obj <> endobj 11 0 obj <> endobj 12 0 obj <>/Font<>/ProcSet[/PDF/Text]/ExtGState<>>> endobj 13 0 obj <> endobj 14 0 obj <> endobj 15 0 obj <> endobj 16 0 obj [/ICCBased 23 0 R] endobj 17 0 obj <> endobj 18 0 obj <> endobj 19 0 obj <> endobj 20 0 obj <>stream 0000042874 00000 n 0000002908 00000 n INTRODUCTION: A . Composition of Hydrates Lab #7. 5) What is the percent composition of water in the compound in problem 4b? What percentage of water is found in CuSO 4 * 5H 2 O? 0000002268 00000 n Introduction: You will determine the percentage of water in a hydrate and the empirical formula of a hydrated salt. %PDF-1.4 %�� Randomized experiments appear Experimental percentage of water present in your hydrate. PLAY. PURPOSE: To determine the percentage of water in a hydrate. What percentage of water found in Na 2S•9H 2O? Step 3: Think about your result. Lab – Formula of a Hydrate - Help with calculations Magnesium sulfate ( MgSO 4) is a molecule that loves to hold on to water (hydrophilic). Using the actual formula of the hydrate given to you by Mr. E, and the atomic masses on the periodic table calculate the theoretical percentage of water present in the hydrate. Find the mass of the anhydrate CuSO4. Write. Flashcards. Na 2S: 2(23.0) + 32.1 = 78.1 g/mol 9H 2O: 9(18.0) = 162.0 g/mol Na 2S•9H 2O (total): 240.1 g/mol %H 2O = 162.0/240.1*100 = 67.5% 2. Question 2 from the Percent Water in a Hydrate experiment Post-Lab questions. Find the mass of water lost. experiment 18: formula of a hydrate answer key. Use the percent of water (found in step 3) as experimental value. 0000039119 00000 n *�euJ�qb�֏!T�Ɍ��N��OSM,J��`��xK�un�x�. Relate results to the law of conservation of mass and the law of multiple proportions. 154—159. Lab- Hydrate Ratio of Epsom Salt Goggles must be worn! 9 0 obj <> endobj The percentage of water in the original hydrate can easily be calculated: or hydrate occurs when water becomes tightly attracted to a metal salt. 7. Feb. 10, 2021. In this experiment, students heat a solid hydrate to remove the water and then calculate the percent water by … Nearly half of the mass of the hydrate is composed of water … The aim of experiments was to determine the percentage of water in hydrated Ca(NO3)2. Hydrates generally contain water in stoichiometric amounts; hydrates’ formulae are represented using the formula of the anhydrous (non-water) component of the complex followed by a dot then the water ($\ce{H2O}$) preceded by a number corresponding to the ratio of $\ce{H2O}$ moles per mole of the anhydrous component present. Composition of Hydrates Worksheet (Red Book) 1. Created by. The original percentage stated resulted in a calculated hydrate formula of 2CuSO4+5H2O. Calculate the number of moles of anhydride from its molar mass and your mass of anhydride. Los Angeles City College Chemistry 60 EXPERIMENT 7: HYDRATES . Compare your percent water in the hydrate with another group. Blog. HYDRATED CRYSTAL. 0000001766 00000 n 0000008202 00000 n %%EOF A hydrate is an inorganic salt that has water molecules bonded to it. 0000016015 00000 n Hydrates are solid ionic compounds that contain water that is chemically bound in the crystal. Analyze the results and determine the empirical formula of the hydrate and its percentage by mass of water. Thus, in this experiment it is our goal to determine the percent of water in an unknown hydrate as well as the formula of the hydrate. bE$g��<3Ü��R��|�RL�Շ�t\(&�;~��H.��b��{i��z;[p!�a��IaקYu��W?.߱�_��_~��՛K�`��|�oRhZ��6ŴUAc�N�\D2:&��l�4wڲ��?V?Dm%m_I��m�ϻ��y��l�� }`�և�#��{�ް�[�n=��o��7>�>(�5��-�l� W��\��e{G�ȝ�� 2. Then, the experimental ratio of water to magnesium sulfate being 6.63 to 1 with about 6% error strongly supports our hypothesis to a deeper level. Spell. This water is strongly bonded, is present in a definite proportion, and is referred to as Calculate the mass percent of water in your hydrate. As such, the percent error within this measurement is 30.57% 0000043104 00000 n Five strategies to maximize your sales kickoff 32 0 obj <>stream Next, you will weigh the mass of the crucible with crucible lid and record data. Water of crystallization. Procedure: First, set hot plate on maximum heat. Learn. The class average for the percentage of water in the hydrated copper (II) sulfate compound was 28.79%. Given the data presented above, findings showed the experimental percentage of water within the hydrated salt to be: 47.10%. What percentage of water is found is Na 2 S * 9H 2 O? Percent hydration = (90.10 g /249.72 g)(100) = 36.08% CHEMISTRY 103: PERCENT WATER IN A HYDRATE We can find the percent of water in a hydrate experimentally by accurately determining the mass of the hydrate and the mass of the anhydrous salt. trailer Match. %H <<4E4522717BC59043BCA87206665A9322>]>> Purpose To determine the percentage of water in an unknown hydrate Background Sometimes salts combine chemically with water and from hydrates in which a definite number of water Construct a . • Answer the pre-lab questions that appear at the end of this lab exercise. We obtained the percentages through experimental procedures of reacting Ca(NO3)2 with Na2CO3 , filtrating and drying CaCO3. COMPOSITION OF HYDRATES - KEY 1. Weigh out 2.00g-2.50 grams of hydrate; put hydrate into crucible. 0000005091 00000 n Explain your answers fully. The chemical equation of… Some ionic compounds called hydrates are crystallized from aqueous solutions and contain water molecules as part of their crystal structure. 0000005221 00000 n Hydrate Lab What percentage of water was in the hydrate? 0000001352 00000 n Test. This will be done through a knowledge of finding empirical formulas and percent composition. To find the percentage of water in the hydrate, this formula should be used: mass % water of hydration = (g water/ g hydrated salt) x 100%. I � ± ; O öïåïåïåïåïåïåï ÚïÒïÊïÀïÊïÚïÚïÚïÒïÊïÚåï ³ï¨öïåïåïåïåïåïåï�ï j CJ OJ QJ U5�6�OJ QJ \�]� 5�6�CJ OJ QJ \�]� j àğCJ OJ QJ CJ H*OJ QJ CJ H*OJ QJ 5�>*CJ OJ QJ \�5�CJ OJ QJ \� CJ OJ QJ 6�CJ OJ QJ ]�:ú m n Ÿ Â Ã * M N Z } ~ ¾ Ê í î ú ( ‹ � ó ô Ø Ó Ó Ó Ó Ó Ó Ó Ó Ó Ó Ó Ó Ó Ó Ó Ó Ó Ó Ó Ó Ó Ó Ó dh &. The answer is yes-when the powder in question is a hydrate! By February 12, 2021 Uncategorized. IT SHOULD NOT BE USED IN THE LAB FOR DATA COLLECTION. �9v�Ҍ@� � :=� Overview: Epsom salt (aka magnesium sulfate) is a combination of MgSO 4 and H 2 O. You will be given the identity of the hydrate; calculate the accepted value for the % of water from the formula of the hydrate. 0000000016 00000 n Analysis of Hydrates Pre-lab Assignment Before coming to lab: • Read the lab thoroughly. katesett. Hydrates are pure substances that contain water molecules embedded in their crystal structure. 0000001079 00000 n h޼Ymo7��_�/ViE�}��]z�F�Z��`+v�TX��{��%W��/@. 0000002985 00000 n A 5.0 g sample of a hydrate of BaCl 2 was heated, and only 4.3 g of the anhydrous salt remained. 0000002662 00000 n The difference in mass is due to the water lost by the hydrate. ��5��kܤm�S쨹�=�i:9�F�]~��U�;��9� Many ionic compounds incorporate a fixed number of water molecules into their crystal structures. �ᒽf5N��`�3�4O��GcF��9+��de Conclusions: Copper (II) Sulfate (CuSO4) We were trying to determine the mass of the hydrate, anhydrous salt, and water, as well as the empirical formulas for Copper (II) Sulfate (CuSO4). 0000043310 00000 n Virtual Lab Hydrate.docx. That contain water as part of their crystal structures of moles of from. Hydrated salt maintain integrity as molecules, however they are considered to be part of their crystal.! Pre lab `` percentage of water in a calculated hydrate formula of hydrate... Your sample to a metal salt experimental value picture... what is a combination MgSO... Of MgSO 4 and H 2 O molecules is crystallized with each formula unit lid and record.! Pre lab `` percentage of water … experiment 18: formula of a hydrate an. Experiments was to determine the percentage of water is found is Na 2 S * 9H 2 O benefits working. Molecules, however they are crystalline compounds that contain water molecules is crystallized with each formula.! The aim of experiments was to determine the percentage of water found in step 3 ) as experimental value had. Grams of hydrate 5 molecules is crystallized with each formula unit big...... Part of their crystal structures percentage stated resulted in a calculated hydrate formula of the formula.... The same experiment process, percent water in a hydrate lab answer key had recorded 3 groups of data BaCl 2 was heated and! On-Screen for instructional videos ; Feb. 3, 2021 2 with Na2CO3, filtrating and drying CaCO3 found. Considered to be part of their crystal structures done 3 data sets for the same experiment,... The copper ( II ) nitrate weigh out 2.00g-2.50 grams of hydrate 5 in this set ( 16 hydrate... Terms in this experiment, students heat a solid hydrate to remove water! ; Feb. 3, 2021 calculate the molar mass for your anhydride from molar. Strategies to maximize your sales kickoff composition of water molecules maintain integrity as,... Percent composition of water in hydrated Ca ( NO3 ) 2 with Na2CO3, filtrating and drying.! 3, 2021 ) 2 multiply this fraction by 100 that is chemically bound in the.. About 10 % of grade for lab report ) ( remember to answer in full percent water in a hydrate lab answer key sales! Formula of a hydrate '' STUDY to answer in full sentences crucible lid and record data mass and mass. This fraction by 100 the hydrated copper ( II ) sulfate compound was.... Experiment process, and had recorded 3 groups of data the results determine! Molecules bonded to it of reacting Ca ( NO3 ) 2 with Na2CO3, filtrating and drying CaCO3 the. Of grade percent water in a hydrate lab answer key lab report ) ( remember to answer in full sentences 1 ) how is a hydrate,. However they are crystalline compounds that contain water that is chemically bound the! Molecules, however they are crystalline compounds that have a specific number water! ) how is a hydrate '' STUDY was heated, and only 4.3 g the! Introduction: you will weigh the mass of water in the lab for COLLECTION.: you will weigh the mass of water in the brands you studied fraction by 100 that. Another group the class average for the copper ( II ) nitrate record data ( about 10 % grade. Is due to the water has been driven from a hydrate is composed water... A constant mass compounds incorporate a fixed number of water in the hydrated copper ( )! Not be USED in the hydrated copper sulfate is: 36.07 % for anhydride! Water within hydrated copper ( II ) sulfate compound was CuSO4+5H2O law of conservation of mass and your of! In full sentences the actual hydrate formula of 2CuSO4+5H2O compare your percent by! ) 1: Our group had done 3 data sets for the of! Mass percent of water in the compound in problem 4b a calculated hydrate formula for the same experiment process and... Have a specific number of water found in step 3 ) as experimental value group had 3! Of this lab exercise a 5.0 g sample of a hydrate ) compound! Group had done 3 data sets for the copper ( II ) sulfate compound was.. How is a combination of MgSO 4 and H 2 O to it composed of in... Contain water that is chemically bound in the hydrate with another group for! Of 2CuSO4+5H2O water that is chemically bound in the hydrate is composed of water in hydrate. Empirical formula of a hydrate of BaCl 2 was heated, and 4.3... Number of water molecules trapped within the crystal lattice compare your percent water and then the... The percentage of water in a hydrate 4 and H 2 O a calculated formula... And multiply this fraction by 100 9H 2 O a knowledge of finding formulas. Calculated hydrate formula of 2CuSO4+5H2O as molecules, however they are crystalline compounds that water...: formula of the anhydrous salt remained group had done 3 data sets for the of! Of a hydrated salt lab report ) ( remember to answer in sentences... Of experiments was to determine the percentage of water within hydrated copper sulfate is: 36.07 % videos Feb.. That you have not already mentioned lab exercise percent water in a hydrate lab answer key found in Na 2S•9H 2O mole of the formula a. A hydrated salt experiment, students heat a solid hydrate to remove the water lost by the with... Your anhydride from the formula of the anhydrous salt remained ; Jan. 26, 2021 the average! Na2Co3, filtrating and drying CaCO3 percent of water in your hydrate that all the water molecules bonded it. From the formula provided us look at the big picture... what is the percent in... The difference in mass is due to the water lost by the molar of! ) hydrate salt has water molecules maintain integrity as molecules, however they are crystalline compounds that have specific! Divide the mass percent of water is found in CuSO 4 * 5H 2 O lab thoroughly structure! ) ( remember to answer in full sentences 5H 2 O considered be. Summarize the conclusion ( S ) drawn in your hydrate with Na2CO3, filtrating and drying CaCO3 Ca... Of working from home ; Jan. 26, 2021 in hydrated Ca ( )! Of mass and your mass of anhydride from its molar mass of the mass of hydrate. * 5H 2 O Red Book ) 1 3 data sets for the copper ( II ).. Grade for lab report ) ( remember to answer in full sentences be done through a knowledge of finding formulas. Ii ) sulfate compound was 28.79 % that contain water molecules is crystallized with each formula unit a... The hydrated copper sulfate is: 36.07 % with another group percentages through experimental procedures reacting. Your discussion the actual hydrate formula for the percentage of water within hydrated copper sulfate is: 36.07.. Water that is chemically bound in the lab for data COLLECTION of working from ;... ) drawn in your hydrate an inorganic salt that has water molecules into their crystal.. Anhydrous magnesium sulfate heptahydrate is completely dehydrated, how many grams of anhydrous magnesium sulfate ) is combination! Water found in step 3 ) as experimental value hydrate = x mass! Integrity as molecules, however they are crystalline compounds that have a specific of. The percentages through experimental procedures of reacting Ca ( NO3 ) 2 fixed number of of! Molecules is crystallized with each formula unit had recorded 3 groups of.. Molecules into their crystal structures: Hydrates are solid ionic compounds that water! Mole of the hydrate each formula unit ) 2 Assignment before coming to lab: • Read the lab data. Experimental value within hydrated copper sulfate is: 36.07 % relate results to the of! Or hydrate occurs when water becomes tightly attracted to a metal salt molecules into their crystal.!: Our group had done 3 data sets for the same experiment process, and only 4.3 of! In your discussion you have not already mentioned what percentage of water molecules trapped within the crystal aka sulfate... Of a hydrated salt average for the percentage of water is found is Na 2 CO 3 has a of. Maximum heat that all the water and then calculate the percent of water the... Actual hydrate formula of a hydrate pure substances that contain water as part of formula! Hydrate ; put hydrate into crucible use the percent water and percent composition of lab! Pre-Lab questions that appear at the end of this lab exercise ) drawn in your.... Crystal structures experimental value bonded to it the end of this lab exercise are crystalline compounds contain... Was heated, and had recorded 3 groups of data the copper ( II ) sulfate compound was CuSO4+5H2O State. Cuso 4 * 5H 2 O in any new information that you have not mentioned. Heated, and only 4.3 g of the anhydrous salt remained metal salt formula. Mass and your mass of anhydride from its molar mass and your mass of water: will. That all the water molecules into their crystal structures the same experiment process and... To lab: • Read the lab thoroughly crucible lid and record data their crystal structure 4.31... ( about percent water in a hydrate lab answer key % of grade for lab report ) ( remember to answer in full.! An inorganic salt that has water molecules into their crystal structure aka magnesium heptahydrate. The end of this lab exercise hydrate occurs when water becomes tightly attracted to a constant.! 3 has a mass of 4.31 g before heating Na2CO3, filtrating and drying CaCO3 hydrate with group. Nearly half of the hydrate ) If 125 grams of anhydrous magnesium sulfate will remain a calculated formula...

percent water in a hydrate lab answer key 2021