# 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?

###### FREE Expert Solution
79% (355 ratings)
###### FREE Expert Solution
79% (355 ratings) ###### Problem Details

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?

What scientific concept do you need to know in order to solve this problem?

Our tutors have indicated that to solve this problem you will need to apply the Buffer concept. You can view video lessons to learn Buffer. Or if you need more Buffer practice, you can also practice Buffer practice problems.

What is the difficulty of this problem?

Our tutors rated the difficulty ofNitric acid, HNO2 is a weak acid with Ka= 4.5 x 10-4. It dis...as high difficulty.

How long does this problem take to solve?

Our expert Chemistry tutor, Dasha took 14 minutes and 44 seconds to solve this problem. You can follow their steps in the video explanation above.

What professor is this problem relevant for?

Based on our data, we think this problem is relevant for Professor Cornett's class at Santa Rosa Junior College.