acid and Base

2009-03-08 7:22 am

Propanoic acid is a weak acid. Explain the effect oon the degree of ionizaion of propanoic acis of adding hydrogen chloride gas or sodium propanoate solid to an aqueous of propranoic acid.

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wt's difference from ionization of acid and dissociation?

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老爺子

2009-03-08 8:57 am

✔ 最佳答案

The ionization of propanoic acid:
CH3CH2COOH(aq) + H2O(l) ≒ CH3CH2COO-(aq) + H3O+(aq)

The hydrogen chloride gas dissolved in the solution is completely ionized to give H3O+(aq). The sodium propanoate dissolved in the solution is completely dissociated to give CH3CH2COO-(aq).

In the presence of H3O+(aq) or CH3CH2COO-(aq), the equilibrium position of the above reaction shifts to the left. More molecular CH3CH2COOH(aq) is formed. Therefore, the degree of ionization of propanoic acid decreases.
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