Question : Which of the following is a potash alum?
Option 1: $\mathrm{Na}_2 \mathrm{SO}_4 \mathrm{Al}_2\left(\mathrm{SO}_4\right)_3 \cdot 24 \mathrm{H}_2 \mathrm{O}$
Option 2: $\mathrm{K}_2 \mathrm{SO}_4 \mathrm{Al}_2\left(\mathrm{SO}_4\right)_3 .24 \mathrm{H}_2 \mathrm{O}$
Option 3: $\mathrm{K}_2 \mathrm{SO}_4 \mathrm{Al}_2\left(\mathrm{SO}_4\right)_3 .12 \mathrm{H}_2 \mathrm{O}$
Option 4: $\mathrm{Na}_2 \mathrm{SO}_4 \mathrm{Al}_2\left(\mathrm{SO}_4\right)_3 \cdot 20 \mathrm{H}_2 \mathrm{O}$
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Correct Answer: $\mathrm{K}_2 \mathrm{SO}_4 \mathrm{Al}_2\left(\mathrm{SO}_4\right)_3 .24 \mathrm{H}_2 \mathrm{O}$
Solution : The correct answer is K 2 SO 4 .Al 2 (SO 4 ) 3 .24H 2 O .
Potash alum, sometimes known as potassium aluminium sulphate, is a chemical substance that is frequently found in the dodecahydrate form. It is a double salt that is frequently used to purify water and in medicine. Potash alum has the chemical formula K 2 SO 4 .Al 2 (SO 4 ) 3 .24H 2 O.
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