Carnallite is a double chloride of K and Mg containing 38.86% of water. 0.458 g of it gave 0.71 g AgCl and 0.666 g of it gave 0.27 g magnesium pyrophosphate (Mg_2P_2O_7). Calculate the percentage of KCl in the carnallite.

Carnallite is a double chloride of K and Mg containing 38.86% of water

1.	Carnallite is a double chloride of K and Mg containing 38.86% of water. 0.458 g of it gave 0.71 g AgCl and 0.666 g of it gave 0.27 g magnesium pyrophosphate (Mg_2P_2O_7). Calculate the percentage of KCl in the carnallite.
Answer» SOLUTION :Only `MgCl_2` can GIVE `Mg_2P_2O_7`. Thus, the percentage of `MgCl_2` can be determined. `2MgCl_2toMg_2P_2O_7` `0.27g of Mg_2P_2O_7-=(190xx0.27)/(222)=0.231 G of MgCl_2` `% of MgCl_2=(0.231xx100)/(0.666)-=34.68%` `% of HCl-=100-(34.68+38.86)-=26.46%`