What will happen if a small amount of sodium hydroxide is added to a 0.1 M solution of ammonia? A)K_b for ammonia will decrease. B)The percent ionization of ammonia will increase. C)K_b for ammonia will increase. D)The percent ionization of ammonia will decrease. E)The percent ionization of ammonia will remain unchanged.

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Quizplus · Accepted Answer

When a small amount of sodium hydroxide is added to a 0.1 M solution of ammonia, it reacts with ammonia to form ammonium ions and thereby decreasing the concentration of ammonia. This, in turn, decreases the percent ionization of ammonia because the ratio of NH3 to NH4+ changes. Therefore, the Ka (acid dissociation constant) of ammonia will decrease.

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