2.0 g of a sample containing NaCl , NaBr and some inert impurity is dissolved in enough water and treated with excess of AgNO 3 solution. A 3.0 g of precipitate was formed. Precipitate on shaking wi

Question

2.0 g of a sample containing NaCl , NaBr and some inert impurity is dissolved in enough water and treated with excess of AgNO 3 ​ solution. A 3.0 g of precipitate was formed. Precipitate on shaking with aqueous NaBr gains 0.7476 g of weight. Determine mass percentage of NaCl in the original sample. (Given: Aw of Na = 23, Cl = 35.5, Br = 80, Ag = 108)

TestHub · Accepted Answer

NaCl , NaBr , impurities xg y g ( 2 − x − y ) g 58.5 x ​ × 143.5 + 103 y ​ × 188 = 3 [ 58.5 x ​ × 188 − 58.5 x ​ × 143.5 ] = 0.76 ⇒ x = 1 g

Chemistry - Stoichiometry Question with Solution | TestHub

Doubts & Discussion