CE chem: which hydroxide .....

2009-04-22 8:34 am

Which of the following hydroxide would react with both acid and alkali to give a salt and water?

A. zinc hydroxide
B. copper(II) hydroxide
C. iron (II) hydroxide
D. calcium hydroxide....

The answer is A, but i want a brief explanation.
thanks alot

回答 (1)

老爺子

2009-04-22 9:10 am

✔ 最佳答案

It is a property of acid that an acid solution would neutralize metal hydroxides, such as zinc hydroxide. The neutralization of an acid solution and zinc hydroxide and an acid gives a salt of zinc and water.
Zn(OH)2(s) + 2H+(aq) → Zn2+(aq) + 2H2O(l)

It is also known that zinc hydroxide dissolves in excess strong alkalis, such as sodium hydroxide. In the reaction, a salt of zincate and water are formed.
Zn(OH)2(s) + 2OH-(aq) → ZnO22-(aq) + 2H2O(l)

It is also known that the other three metal hydroxides can also neutralize acids, but they do not react with excess strong alkalis.

Therefore, the answer is A.
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