Q.
What is the mass of the precipitate formed when 50 mL of 16.9 % solution of AgNO3 is mixed with 50 mL of 5.8% NaCl solution? (Ag=107.8, N=14,O=16,Na=23,Cl=35.5)
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answer is 2.
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Detailed Solution
16.9% solution of AgNO3 means 16.9 g of AgNO3 in 100 mL of solution.16.9 g of AgNO3 in 100 mL solution = 8.45 g of AgNO3 in 50 mL solution. Similarly, 5.8% of NaCl in 100 mL solution = 2.9 g of NaCl in 50 mL solution.The reaction can be represented as : AgNO3+NaCl⟶AgCl+NaNO3Initially 8.45/170 2.9/58.5 = 0.049 mol = 0.049 molFinally 0 0 0.049 mol 0.049 mol∴ Mass of AgCl precipitated =0.049×143.3 =7.02≈7 g
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