A crystalline hydrated salt on being heated loses 45.6% of its weight. Percentage composition of anhydrous salt is Al - 10.5 %, K - 15.1 %, S -24.8 %, O - 49.6 %. Find molecular formula of salt (hydrated) (M = 948 g/mol for hydrated salt).
Text Solution
Verified by ExpertsA
K 2 SO 4 .Al 2 (SO 4 ) 3 .24H 2 0
For anhydrous salt
Element Al K S O
Atomic ratio 
0-39 0-39 0-78 3-10
Empirical formula of anhydrous salt = KAlS 2 O 8
E.F mass of Anhydrous salt = 258 g/mol
Mass of Moisture = 
mole
Empirical formula of Anhydrous salt KA1S 2 O 8 .12H 2 O
E F Mass = 258 + 216 = 474 g/Empirical formula mass
Molecular Formula = K 2 Al 2 S 4 O 16 .24H 2 O
= K 2 SO 4 .Al 2 (SO 4 )3.24H 2 O
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