Chemistry - Complete Pblock- Question with Solution | TestHub

The chemical formula of potash alum is ${\text{K}}_2{\text{SO}}_4\cdot {\text{Al}}_2({\text{SO}}_4{)}_3\cdot 24{\text{H}}_2\text{O}$.

In one formula unit of potash alum, the number of ${\text{K}}^{+}$ ions is $2$.

The number of ${\text{SO}}_4^{2-}$ ions is $1+3=4$.

The ratio of ${\text{K}}^{+}$ to ${\text{SO}}_4^{2-}$ ions is $2:4$, which simplifies to $1:2$.

Answer: $1:2$