Question

Which of the following is a base? AgO Ca(OH)2 HF NaCl

Answer 1

Answer: The correct answer is $Ca(OH)_2$

Explanation:

A base is defined as the substance which looses hydroxide ions $(OH^-)$ when dissolved in water.

An acid is defined as the substance which looses hydrogen ions $(H^+)$ when dissolved in water.

From the given options:

AgO and NaCl are the salts. Both are ionic salts which are formed from the reaction of a metal and an non-metal.

HF is an acid because it released $H^+$ ions when dissolved in water. The equation for the ionization of HF follows:

$HF\rightleftharpoons H^++F^-$

$Ca(OH)_2$ is a base because it released $OH^-$ ions when dissolved in water. The equation for the ionization of $Ca(OH)_2$ follows:

$Ca(OH)_2\rightleftharpoons Ca^{2+}+OH^-$

Hence, the correct answer is $Ca(OH)_2$

Answer 2

Answer:

Ca(OH)

Explanation:

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