654 654 Chapter Fourteen Acids and een Acids and 2:45 Calculate the percent diss

Question

654 654 Chapter Fourteen Acids and een Acids and 2:45 Calculate the percent dissociation of acetic acid (Ka-| .8 × 1 Calculate the percent dissociation of acetic acid (Ka 1.8 x 10-5) in each of the following solutions: 1.0 MH3CCO2H 0.100 M H3CCO2H Be able to use a substance's percent dissociation to solve for its Ka value Lactic acid (HC3H503) is a chemical that accumulates in muscle tissue during exertic 0.100 M aqueous solution, lactic acid is 3.7 % dissociated. Calculate the value of Ka f acid.31,monul 100

Explanation / Answer

Percent of dissociation:

* 1M H3CCO2H.

%dis = amount diss / initial conce.

CH3COOH <----> CH3COO- + H+

In 1M 0 0

in -x x x

eq 1-x x x

Keq = x2/(1-x) = 1.8x10-5

Solving for x :

[H+] = x = 0.004223 M

% dis = 0.004223/1 * 100 = 0.4234 %.

B) [H+] = 0.00133

%dis = 0.00133/0.1 *100 = 1.33 %

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