Chemistry help?

Question

What is the pH of a buffer solution that is 0.45 M aceticc acid (HC2H3O2) and 0.85 M sodium acetate (NaC2H3O2)? The Ka for acetic acid is 1.8 × 10–5. 

 

Answer 1

Step 1:

The concentration of acetic acid [HCH₂H₃O₂] is 0.45 M.

The concentration of sodium acetate [NaC₂H₃O₂] is 0.85 M.

k_a for acetic acid is .

Definition of pH:

pH of the buffer solution is 5.0209.

Solution:

pH of the buffer solution is 5.0209.