Question

Which of the following sulphates have the highest solubility in water.

• A. $MgSO_{4}$
• B. $BaSO_{4}$
• C. $CaSO_{4}$
• D. $BeSO_{4}$

Answer 1

Answer: (B)

$BaSO_{4}$

Answer 2

$2\underset{\text{Gypsum}}{(CaSO_{4}.2H_{2}O)}\underset{\text{Dehydration}}{\overset{\quad 120^{o}C\quad}{\rightarrow}}\mspace{6mu}\underset{\text{Plaster of paris }}{2CaSO_{4}.H_{2}O} + 3H_{2}O$