Question

In the analysis of 0.500 g sample of feldspar, a mixture of the chlorides of sodium and potassium is obtained, which weighs 0.1180 g, Subsequent treatment of the mixed chlorides with silver nitrate gives 0.2451 g of silver chloride. What is the percentage of sodium oxide and potassium oxide in feldspar. 

Answer 1

Let the amount of sodium chloride = x g

Then, the amount of potassium chloride = (0.1 180 - x) g

Now, mixed chlorides reacts with AgNO₃ to give AgCl as follows

Total weight of AgCl obtained from mixed chlorides