1.0g ofa samplecontaining NaCl, KCl and some inert impurity is dissolvedin excess of water and treated with excess of AgNO_(3) solution. A 2.0 g precipitate to AgCl separate out. Also sample is 23% by mass in sodium. Determine mass percentage of KCl in the sample :

1.0g ofa samplecontaining NaCl, KCl and some inert impurity is dissolv

1.	1.0g ofa samplecontaining NaCl, KCl and some inert impurity is dissolvedin excess of water and treated with excess of AgNO_(3) solution. A 2.0 g precipitate to AgCl separate out. Also sample is 23% by mass in sodium. Determine mass percentage of KCl in the sample :
Answer» Solution :Moles of `NaCl`in SAMPLE `=0.01` = moles of `AgCl` from `NaCl` in PRECIPITATE `=0.01` Total moles of `AgCl` precipitate `=(2)/(143.5)=0.01393` implies Moles of `AgCl` from `KCL = 0.00393` = moles of `KCl` implies Mass of `KCl` in sample `=0.00393xx74.5=0.2928g` Mass `%` of `KCl` in the sample `=29.28`