1.

Commercial sodium hydroxide weighing 30 g has some sodium chloride in it. The mixture on dissolving in water and subsequent treatment with excess silver nitrate solution formed a precipitate weighing 14.3 g.What is the percentage of sodium chloride in the commercial sample of sodium hydroxide ? The equation for the reaction isNaCl + AgNO3-----------> AgCl + NaNO3 [Relative molecular mass of NaCl = 58; AgCl = 143]

Answer»

NaCl + AgNO3-----------> AgCl + NaNO3 

143 g of AgCl is obtained from 58 g of NaCl

14.3 g of AgCl will be obtained from 58 x 14.3/143 = 5.8 g of NaCl 

Weight of commercial NaOH = 30 g

% of NaCl in NaoH = 5.8/100/30 = 19.33%



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