The mass percent of KHP in an unknown salt sample was determined using both volumetric and  gravimetric titration. Ten determinations using each method were performed: (You should be using  Excel to solve for the required values)  Volumetric (% KHP): 34.22  33.86  34.07  34.49  34.69  33.71  34.28  34.11  34.26  34.10 Gravimetric (% KHP): 34.35  34.26  34.10  34.19  34.18  34.32  34.11  34.33  34.17  34.12 a) Do the two methods give similar standard deviations? b) Do the two methods give similar results for the mass percent of KHP at the 95% confidence level?

Fundamentals Of Analytical Chemistry
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ISBN:9781285640686
Author:Skoog
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Chapter16: Applications Of Neutralization Titrations
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Problem 16.20QAP
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6. The mass percent of KHP in an unknown salt sample was determined using both volumetric and 
gravimetric titration. Ten determinations using each method were performed: (You should be using 
Excel to solve for the required values) 

Volumetric (% KHP): 34.22  33.86  34.07  34.49  34.69  33.71  34.28  34.11  34.26  34.10
Gravimetric (% KHP): 34.35  34.26  34.10  34.19  34.18  34.32  34.11  34.33  34.17  34.12

a) Do the two methods give similar standard deviations?

b) Do the two methods give similar results for the mass percent of KHP at the 95% confidence level?  

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