Question

What is the chemical formula of triple superphosphate?

• A. $Ca\left(H_{2}P{O}_4\right).2H_{2}O$
• B. $Ca{\left(H_{2}P{O}_4\right)}_2.H_{2}O$
• C. $Ca\left(H_{2}P{O}_4\right).3H_{2}O$
• D. $CaS{O}_4.3H_{2}O$

Answer 1

The correct option is B $Ca{\left(H_{2}P{O}_4\right)}_2.H_{2}O$

Triple Superphosphate is manufactured in a two stage process. First, sulphuric acid is reacted with phosphate rock, to produce phosphoric acid. Gypsum is a by-product of the stage and is removed. Secondly, the phosphoric acid is reacted with phosphate rock resulting in triple superphosphate.
Calcium superphosphate is an inorganic compound with the chemical formula $Ca{\left(H_{2}P{O}_4\right)}_2$. It is commonly found as the monohydrate $Ca{\left(H_{2}P{O}_4\right)}_2.H_{2}O$ . Both salts are colourless solids. They are used mainly as superphosphate fertilizers.