Chemistry
Commercial NaOH weighing 30 g. has some NaCl in it. The mixture on dissolving in water and treatment with excess AgNO3 soln. formed a precipitate weighing 14.3 g. What is the percentage of NaCl in the commercial sample of NaOH.
NaCl + AgNO3 ⟶ AgCl + NaNO3
[Relative molecular mass of NaCl = 58 ; AgCl = 143]
Stoichiometry
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Answer
(i) 143 g AgCl is formed by 58 g NaCl
∴ 14.3 g of AgCl will be formed by x 14.3 = 5.8 g
Percentage of NaCl = x 100 = 19.33%
Hence, percentage of NaCl is 19.33%
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