0.3174 g sample of an unknown acid requires 26.23 mL of 0.1056 M NaOH for neutralization to a phenolphthalein end point. There are 0.27 mL of 0.1096 M HCl used for back-titration. a. How many moles of OH− are used? How many moles of H+ from HCl? b. How many moles of H+ are there in the solid acid? c. What is the molar mass of the unknown acid?
0.3174 g sample of an unknown acid requires 26.23 mL of 0.1056 M NaOH for neutralization to a phenolphthalein end point. There are 0.27 mL of 0.1096 M HCl used for back-titration. a. How many moles of OH− are used? How many moles of H+ from HCl? b. How many moles of H+ are there in the solid acid? c. What is the molar mass of the unknown acid?
Chemistry: Matter and Change
1st Edition
ISBN:9780078746376
Author:Dinah Zike, Laurel Dingrando, Nicholas Hainen, Cheryl Wistrom
Publisher:Dinah Zike, Laurel Dingrando, Nicholas Hainen, Cheryl Wistrom
Chapter24: Nuclear Chemistry
Section: Chapter Questions
Problem 7STP
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0.3174 g sample of an unknown acid requires 26.23 mL of 0.1056 M NaOH for neutralization to a phenolphthalein end point. There are 0.27 mL of 0.1096 M HCl used for back-titration.
a. How many moles of OH− are used? How many moles of H+ from HCl?
b. How many moles of H+ are there in the solid acid?
c. What is the molar mass of the unknown acid?
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