Ncert Exercises & Solutions

Amphoteric hydroxides react with both alkalies with acids. Which of the following Group 2 metal hydroxides is soluble in sodium hydroxide?

1. $Be {(OH)}_{2}$

2. $Mg {(OH)}_{2}$

3. $Ca {(OH)}_{2}$

4. $Ba {(OH)}_{2}$

Hint: Beryllium oxide, and hydroxide are amphoteric in nature.

The solubility of hydroxides of alkaline earth metals increases from Be to Ba, in water.

Be {(OH)}_{2}

and

Mg {(OH)}_{2}

are almost insoluble.

Due to high hydration enthalpy and high lattice energy

Be {(OH)}_{2}

is not soluble in water.

Be {(OH)}_{2}

is an amphoteric hydroxide. With acids,

Be {(OH)}_{2}

is neutralized giving salts.

Be {(OH)}_{2} + 2 HCl \to {BeCl}_{2} + 2 H_{2} O

Be {(OH)}_{2}

reacts with NaOH also forming beryllate.

Be {(OH)}_{2} + 2 NaOH \to {Na}_{2} {BeO}_{2} + 2 H_{2} O

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