Question

A buffer solution contains 0.15 M nitrous acid (HNO2) and 0.10M soldium nitrite (NaNO2). The acid dissociation contant (Ka) of nitrous acid is 4.5E-4.

A. What is the pH of the buffer system?
B. a 50.0 mL aliquot portion of the buffer solution is used to stabilize reaction. After 2.0 mL of 1.50 M HCl is added to the solution, what is the new pH?
C. A 50.0 mL aliquot portion of the buffer soltuion is sed to stabilize a reaction. After 6.00 mL of 1.50M NaOH is added to the soltuion, what is the new pH?

Answer 1

use the henderson-hasselbalch equatin for a

fidn the new conc of H+, use the henderson h for b

apply the same method for c

Answer 2

Thanks