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Approximate mass of NazS203·5H20 needed 1.55 Exact mass of Na2SzO3•5H20 weighed 1.57 Nominal molarity of NazS203 solution Calculation:

Approximate mass of NazS203·5H20 needed 1.55 Exact mass of Na2SzO3•5H20 weighed 1.57 Nominal molarity of NazS203 solution Calculation:

Fundamentals Of Analytical Chemistry
Fundamentals Of Analytical Chemistry
9th Edition
ISBN:9781285640686
Author:Skoog
Publisher:Skoog
Chapter5: Errors In Chemical Analyses
Section: Chapter Questions
Problem 5.10QAP
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How do you calculate the nominal of Na2S2O3 of the solution? 

Prepare 250 mL of 0.025 M NazS203. Because the Na2S203 solution is the titrant, its concentration must be known with accuracy. Although the solution is dilute, you are preparing a relatively large volume, so it can be prepared directly from the solid. Using the proper lab technique, prepare the solution. Record the exact mass of NazS2O3-5H2O used to all allowable significant figures. Calculate and record the molarity of the actual solution to all allowable significant figures, and show your calculations and results below. Because the NazS203-5H2O used to make the solution may be impure (and/or the water of hydration number may be variable), we will call this the “nominal" molarity (the molarity that the solution would be, if the NazS203.5H20 were pure) rather than the "exact" molarity. Before you use the NazS203 solution to analyze your saturated Ca(103)2 solution, you will standardize it against your accurately known, dilute KIO3 solution in order to confirm its molarity. Approximate mass of NazS203-5H20 needed 1.55 1.57 Exact mass of Na2S203•5H20 weighed Nominal molarity of NazS203 solution Calculation: 155
Transcribed Image Text:Prepare 250 mL of 0.025 M NazS203. Because the Na2S203 solution is the titrant, its concentration must be known with accuracy. Although the solution is dilute, you are preparing a relatively large volume, so it can be prepared directly from the solid. Using the proper lab technique, prepare the solution. Record the exact mass of NazS2O3-5H2O used to all allowable significant figures. Calculate and record the molarity of the actual solution to all allowable significant figures, and show your calculations and results below. Because the NazS203-5H2O used to make the solution may be impure (and/or the water of hydration number may be variable), we will call this the “nominal" molarity (the molarity that the solution would be, if the NazS203.5H20 were pure) rather than the "exact" molarity. Before you use the NazS203 solution to analyze your saturated Ca(103)2 solution, you will standardize it against your accurately known, dilute KIO3 solution in order to confirm its molarity. Approximate mass of NazS203-5H20 needed 1.55 1.57 Exact mass of Na2S203•5H20 weighed Nominal molarity of NazS203 solution Calculation: 155
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