Q. What is the value of x in the potash alum $ {{K}_{2}}S{{O}_{4}}.A{{l}_{x}}{{(S{{O}_{4}})}_{3}}.24{{H}_{2}}O $ ?
Rajasthan PETRajasthan PET 2007
Solution:
Potashalum is a double salt. Potash alum :
$ {{K}_{2}}S{{O}_{4}}.A{{l}_{x}}{{(S{{O}_{4}})}_{3}}.24{{H}_{2}}O $
Ion Valency
Hence, the compound of $ A{{l}^{3+}} $ and $ SO_{4}^{2-} $ is $ A{{l}_{2}}{{(S{{O}_{4}})}_{3}} $
On comparison $ x=2 $
