Q.

Find the equivalent weight of K2SO4⋅Al2SO43⋅24H2O(at. wt; K = 39, S = 32, O = 16, Al= 27)

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answer is 118.5.

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Detailed Solution

Mol. wt. of K2SO4⋅Al2SO43⋅24H2O=(2×39)+32+(4×16)+(2×27)+3[(32+(4×16)]+24[(2×1)+16]=948gmol−Total +ve charge on 2K+ of K2SO4=2×1=2Total +ve charge on 2Al3+ of Al2SO43=2×3=6Total +ve charge on  K2SO4⋅Al2SO43⋅24H2O=2+6=8∴   Eq. wt. of K2SO4⋅Al2SO43⋅24H2O=9488                                                          = 118.5 Ans.
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