What is the pH of 0.01 M glycine solution? For glycine K_ a₁ =4.5 10⁻³ and K_ a₂ =1.7 10⁻¹⁰ at 298 ~K .

Step-by-step solution

Glycine H ₃ ~N ⁺ CH ₂ COO ⁻ is more acidic than basic. Instead of K_b value, the second given K_a value is corresponding to the K_b value ( K_a K_b=10⁻¹⁴ ) . Hence, overall ionization constant, aligned & K=K_ a₁ K_ a₂ =4.5 10⁻³ 1.7 10⁻¹⁰ & =7.65 10⁻¹³ & H ⁺= K C = 7.65 10⁻¹³ 0.01 & = 0.765 10⁻¹⁴ =0.87 10⁻⁷ M & pH =- (0.87 10⁻⁷ )=7.06 & aligned