Chemistry help?

Question

Example 3: Exactly 100. mL of 0.100 M HNO2 is 9trated with a 0.100 M NaOH solu9on. What is the pH at the equivalence point? 

 

Answer 1

Step 1:

The concentration of M.

The nitrous solution ionization constant .

The nitrous acid is a weak acid and is strong base.

Acid ionization constant for above reaction is,

The concentration of at the equivalence point.
Substitute M.

Substitute .

.

.

Step 2:

Formula for .

The at the equivalence point is .

Solution:

The at the equivalence point is .