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Q.
Value of $x$ in potash alum, $K_2SO_4\cdot Al_x(SO_4)_3\cdot 24H_2O$ is
UP CPMTUP CPMT 2007
Solution:
Potash alum $K_{2}SO_{4}. Al_{x}(SO_{4})_{3}.24H_{2}O$
It is a double salt
Therefore, $Al_{2}(SO_{4})_{3}$- compound of $Al^{3+}$ and $SO^{2-}_{4}$ On comparing, $x=2$
Hence, formula o f potash alum is
$K_{2}SO_{4}. Al_{2}(SO_{4})_{3}. 24H_{2}O$
