Engage Explore Evaluate Explan oysta taltice of ico The hydrates that you\'l bo
ID: 1581958 • Letter: E
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Engage Explore Evaluate Explan oysta taltice of ico The hydrates that you'l bo analyzing are of enetal salb am, water moloa trapped b toosna at a number of metal salt nydratea tn each casB.the mmber of water molecules per meta, san formula amount is a small number or simple fraction Tho proceano urmply weighs the metal salt hydrato bekre and after heat is used to drive out tho water and to torm en anhydrous (without water) sait. The difterence in mass is the mass of the water lost ou' be graphing the weight after heating against the weight before in regutar increments The slope of the resulting tne is the ratio of the molecutar mass of anhydrous sall to that of the hydrated sait There's only one catch Some salts, when heated. decompose as well as lose their water of hydration The sait not only loses its water, but changes its idtentity 1. Read the LAB DESCRIPTION and determine, in your opinion, what the slope of your graphs should be greater than one less than one equal to one 2. When heated to drive off the water of crystallization, do you expect the color of the material to change? Yes No 3. Will removing water of crystalizaion change the oxidation states of the elements in a Yes No 4. Which of the following safety precautions would you choose to use when handling the porcelain crucibles used as containers to heat the salts? The heat used is very small so you can just grab the crucibles with your bare hands Rubber gloves will protect your hands well from the temperatures needed to extract the water from the salts Use metal tongs to pick up and move the crucible. 5. How many water molecules do you calculate are attached to barium chloride if the formula weight of the hydated salt is 244.7? The atomic mass of barium is 137.3 daltons. The atomic mass of chlorine is 35.5 daltons 4 6 Would you say that the mass of the water of hydration of barium chloride is greater or less than the mass of the anhydrous barium chloride? The formula weight of the hydated salt is 244.7? The atomic mass of barium is 137.3 daltons. The atomic mass of chlorine is 35.5 daltons. greater less 7 The followina word or ohrases comnare the hvdrated salt to the anhvdrous salt after heatina Powered by Smart Science Experiential Learning Patent No.6,529,705, Copyright 1999-2018. Smart Science Education Inc htm/7ACCOUNT ASUSORG ASUNewport&TID; 1K&SID; 821&UID; 1M&LOGINNA;Explanation / Answer
You have not provided the lab manual and hence I will start answering from question 2.
2)yes, removing water of crystallization generally changes the color of the crystal.
3)No removing water of crystallization just removes water molecules from the crystal. Oxidation state of any element is not changed.
4)Use metal tongs as they are safer.
5)molecular mass of BaCl2 = atomic mass of Ba + 2*atomic mass of Cl
= 137.3+2*35.5
=208.3
Hence, difference = 244.7-208.3
=36.4
Hence 2 water molecules are present as the molecular mass of water is 18
6)mass of water of hydration is just 36.6 which is less than 208.3 (that of BaCl2)
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