Example 7 6 Calculate the acetic acid if its K 1 8 x 105

Last updated: 6/28/2023

Example 7 6 Calculate the acetic acid if its K 1 8 x 105 What would be the degree of ionization if the solution also contains 0 01 M sodium acetate Solution CH COOH aq CH COO aq H aq The degree of ionization of this weak acid can be calculated by the approximate relation V C Ka 1 8 x 10 5 0 02 Now let us calculate the degree of ionization when the solution also contains 0 01 M sodium acetate Sodium acetate being a strong electrolyte would be completely ionized in solution Let x mol L 1 of acetic acid be ionized CH COOH aq CH COO aq H aq 0 02 x M x M x M CH3COONa aq CH3COO aq Na aq 0 01 M 0 01 M 18 x 107 H x mol L CH COO x 0 01 mol L 0 01 mol L 1 x is very small as compared to 0 01 CH COOH 0 02 x mol L 0 02 mol L 1 H CH COO CH COOH K 5 x x 0 01 0 02 x 3 6 x 10 5 H 3 6 x 10 5 M Degree of ionization 0 03 3 x 10 r 3 6 10 5 1 8 x 104 0 02 0 02 Thus it may noted that the degree of ionization of acetic acid has decreased from 3 x 10 2 to 18 x 10 due to the presence of sodium acetate Sodium acetate suppresses the degree of ionization of