Problem: CN– is the conjugate base to the weak acid HCN, with Ka = 6.0 × 10–10, pKa = 9.22.Given a 50 mL of a 0.1 M of NaCN (which dissociates completely), how many mL of 1.0 M HCl should be added to the solution in order to to bring the pH to 9.22?

FREE Expert Solution
89% (434 ratings)
Problem Details

CN is the conjugate base to the weak acid HCN, with K= 6.0 × 1010, pKa = 9.22.

Given a 50 mL of a 0.1 M of NaCN (which dissociates completely), how many mL of 1.0 M HCl should be added to the solution in order to to bring the pH to 9.22?

Frequently Asked Questions

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.

How long does this problem take to solve?

Our expert Chemistry tutor, Dasha took 10 minutes and 23 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 Geldart's class at URI.