chem Question

☆ 天與空 ★ ◤

2008-10-20 5:20 am

Which of the following gases, after passing through deionized water, cannot produce an electrolyte?
(1) Chlorine
(2) Hydrogen
(3) Nitrogen monoxide

p.s. please explain , thanks a lot

回答 (1)

Uncle Michael

2008-10-20 8:15 am

✔ 最佳答案

The answer is (2) and (3).

(1) is incorrect.
In the solution, the dissolved chlorine reacts with water reversibly to give hydrochloric acid and hypochlorous acid.
Cl2(aq) + H2O(l) ≒ H+(aq) + Cl-(aq) + HOCl(aq)
In the presence of mobile ions, the solution is an electrolyte.

(2) is correct.
The solubility of hydrogen in water is very low. Hydrogen exists as molecules when it is dissolved in water. Since no mobile ions are produced, no electrolyte is produced.

(3) is correct.
The solubility of nitrogen monoxide is low. Nitrogen monoxide exists as molecules when it is dissolved in water. Since no mobile ions are produced, no electrolyte is produced.
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