Calculate the mass of potassium sulfate required to prepare its 23% solution in 100g of water.

Options

A. 29.8g
B. 40g
C. 14g
D. 23g

Answer

D

Explanation

`H_3PO_4` is used to avoid the formation of the insoluble `CaSO_4`(waste product)
Polyphosphate separate `Ca^(2+)` and `Mg^(2+)` (present in hard water ) and forms soluble complex with `Ca^(2+)` and `Mg^(2+)` which do not precipitate with `CO_3^(2-)` and soap.