Question

Calcium phosphate can be obtained by reacting calcium hydroxide with:

• A. phosphoric acid
• B. sulphuric acid
• C. nitric acid
• D. both $\left(B\right)$ and $\left(C\right)$

Answer 1

Answer: (A)

phosphoric acid

In a chemical reaction, calcium hydroxide $Ca(OH{)}_2$ reacts with phosphoric acid $H_{3}P{O}_4$ to form calcium phosphate $C{a}_3(P{O}_4{)}_2$ and water $H_{2}O$.

$3Ca(OH{)}_2$ + $2H_{3}P{O}_4$ $\to$ $C{a}_3(P{O}_4{)}_2$ + $6H_{2}O$

Calcium phosphate is the calcium salt of phosphoric acid. It is an odourless white solid.

Hence, option $A$ is correct.