A 349-mL buffer solution is 0.372 M in nitrous acid (HNO2) and 0.346 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. Part B: What is the pH after adding 140 mL of 0.100 M HCl to the initial buffer solution?Express your answer using two decimal places. Part C:

Chemistry: The Molecular Science
5th Edition
ISBN:9781285199047
Author:John W. Moore, Conrad L. Stanitski
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Chapter15: Additional Aqueous Equilibria
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Problem 85QRT: A buffer solution was prepared by adding 4.95 g sodium acetate to 250. mL of 0.150-M acetic...
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A 349-mL buffer solution is 0.372 M in nitrous acid (HNO2) and 0.346 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. Part B: What is the pH after adding 140 mL of 0.100 M HCl to the initial buffer solution?Express your answer using two decimal places. Part C: 

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