A 232-mL buffer solution is 0.449 M in nitrous acid (HNO2) and 0.322 M in sodium nitrite (NaNO2). Ka(HNO2)=5.6×10-4 Part A: What is the initial pH of this solution? Express your answer using two decimal places. pH = Check Part B: What is the pH after adding 130 mL of 0.100 M HCI to the initial buffer solution? Express your answer using two decimal places. pH Check Part C: What is the pH after adding 129 mL of 0.100 M KOH to the initial buffer solution? Express your answer using two decimal places. pH = Check

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 98QRT: Does the pH of the solution increase, decrease, or stay the same when you (a) Add solid sodium...
Question
A 232-mL buffer solution is 0.449 M in nitrous acid (HNO2) and 0.322 M in sodium
nitrite (NaNO2).
Ka(HNO2)=5.6×10-4
Part A:
What is the initial pH of this solution? Express your answer using two decimal places.
pH
%D
Check
Part B:
What is the pH after adding 130 mL of 0.100 M HCI to the initial buffer solution?
Express your answer using two decimal places.
pH
Check
Part C:
What is the pH after adding 129 mL of 0.100 M KOH to the initial buffer solution?
Express your answer using two decimal places.
pH
Check
Transcribed Image Text:A 232-mL buffer solution is 0.449 M in nitrous acid (HNO2) and 0.322 M in sodium nitrite (NaNO2). Ka(HNO2)=5.6×10-4 Part A: What is the initial pH of this solution? Express your answer using two decimal places. pH %D Check Part B: What is the pH after adding 130 mL of 0.100 M HCI to the initial buffer solution? Express your answer using two decimal places. pH Check Part C: What is the pH after adding 129 mL of 0.100 M KOH to the initial buffer solution? Express your answer using two decimal places. pH Check
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