Question

21.6 gram of silver coin is dissolved in hno3.when nacl is added to this solution all silver is precipitated as agcl.the weight of agcl is found to be 14.35 gram then %of silvar in coin is

Answer 1

Fraction of Ag in AgCl = 107.9/143.3= 0.753 weight of Ag in 7.20 g AgCl

= 0.753 × 7.20 g = 5.42 g Ag

Hence the 5.82 g coin contains 5.42 g Ag = 0

Fraction of Ag in coin = 5.42 g/5.82 g

= 0.931 = 93.1 % Ag