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Q. Superphosphate of lime is

The p-Block Elements - Part2

Solution:

Superphosphate of lime: It is a mixture of calcium dihydrogen phosphate and gypsum and is obtained by treating phosphate rock with conc. $H_2SO_4$
$Ca_3(PO_4)_2 + 2H_2SO_4 + 5H_2O$
$\rightarrow \underset{\text{Superphosphate of lime}}{Ca(H_2PO_4)_2, 2H_2O } + 2CaSO_4 . 2H_2O$