Answered: A 0.128 g sample of KHP (HKC8H4O4)…

Chemistry: The Molecular Science

5th Edition

ISBN:9781285199047

Author:John W. Moore, Conrad L. Stanitski

Publisher:John W. Moore, Conrad L. Stanitski

Chapter14: Acids And Bases

Section: Chapter Questions

Problem 119QRT

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Question

A 0.128 g sample of KHP (HKC8H4O4) required 28.54 mL of NaOH
solution to reach a phenolphthalein endpoint. Calculate the molarity of the
NaOH.
Hint: first balance the acid base reaction of KHP with NaOH.
A. 0.110 M NaOH
B. 0.0220 M NaOH
C. 1.032 M NaOH
D. 0.921 M NaOH

Expert Solution

Step 1

Solution:- Given data = 0.128 g of KHP (HKC8H404)

Volume of NaOH used = 28.54 mL = 0.02854 L

Molar mass of KHP = 204.22 g/mol

No. of moles of KHP = mass/molar mass = 0.128 g/(204.22 g/mol) = 6.27*10^-4

Now, Chemical reaction:- HKC8H404 + NaOH $\to$ NaKC8H4O4 + H2O

Balanced chemical equation:- HKC8H404 + NaOH $\to$ NaKC8H4O4 + H2O

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