contains 0.433 M hydrocyanic acid and 0.325 M potassium cyanide. Addition of 0.162 moles of hydrobromic acid will: (Assume that the volume does not change upon the addition of hydrobromic acid.) Raise the pH slightly Lower the pH slightly Raise the pH by several units

Chemistry: Principles and Practice
3rd Edition
ISBN:9780534420123
Author:Daniel L. Reger, Scott R. Goode, David W. Ball, Edward Mercer
Publisher:Daniel L. Reger, Scott R. Goode, David W. Ball, Edward Mercer
Chapter16: Reactions Between Acids And Bases
Section: Chapter Questions
Problem 16.78QE
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a. 

A 1 liter solution contains 0.433 M hydrocyanic acid and 0.325 M potassium cyanide.

Addition of 0.162 moles of hydrobromic acid will:
(Assume that the volume does not change upon the addition of hydrobromic acid.)

Raise the pH slightly
Lower the pH slightly
Raise the pH by several units
Lower the pH by several units
Not change the pH
Exceed the buffer capacity
 
b. 
A 1 liter solution contains 0.227 M nitrous acid and 0.303 M sodium nitrite.

Addition of 0.250 moles of barium hydroxide will:
(Assume that the volume does not change upon the addition of barium hydroxide.)
Raise the pH slightly
Lower the pH slightly
Raise the pH by several units
Lower the pH by several units
Not change the pH
Exceed the buffer capacity
c. 
A 1 liter solution contains 0.464 M nitrous acid and 0.348 M potassium nitrite.

Addition of 0.383 moles of hydroiodic acid will:
(Assume that the volume does not change upon the addition of hydroiodic acid.)

Raise the pH slightly
Lower the pH slightly
Raise the pH by several units
Lower the pH by several units
Not change the pH
Exceed the buffer capacity
 
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