Chemistry Practice Problems Buffer Practice Problems Solution: Nitric acid, HNO2 is a weak acid with Ka= 4.5 x 10...

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Solution: Nitric acid, HNO2 is a weak acid with Ka= 4.5 x 10-4. It dissociates according to:HNO2 (aq) ⇌ H+(aq) + NO2-(aq)a.) What is the pH of a buffer solution which is 0.80 M in NO2- and 0.40 M in HNO2?  b.) What will be the pH of the resulting solution when 2.0 mL of 0.5 M HCl are added to 50 mL of this (from part a) buffer solution?   c.) What will be the pH of the resulting solution when 2.0 mL of 0.5 M NaOH are added to 50 mL of this (from part a) buffer solution?

Problem

Nitric acid, HNO2 is a weak acid with Ka= 4.5 x 10-4. It dissociates according to:

HNO2 (aq) ⇌ H+(aq) + NO2-(aq)

a.) What is the pH of a buffer solution which is 0.80 M in NO2- and 0.40 M in HNO2?
 

 

b.) What will be the pH of the resulting solution when 2.0 mL of 0.5 M HCl are added to 50 mL of this (from part a) buffer solution?
 

 

 

c.) What will be the pH of the resulting solution when 2.0 mL of 0.5 M NaOH are added to 50 mL of this (from part a) buffer solution?

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