Chloride samples are prepared for analysis by using NaCl , KCl and NH 4 Cl separately or as mixture. What minimum volume (in ml) of 5 % by weight AgNO 3 solution(sp.gr, 1.02 g ml − 1 ) must be add

Question

Chloride samples are prepared for analysis by using NaCl , KCl and NH 4 ​ Cl separately or as mixture. What minimum volume (in ml) of 5 % by weight AgNO 3 ​ solution(sp.gr, 1.02 g ml − 1 ) must be added to a sample of 0.214 g in order to ensure complete precipitation of chloride in every possible case ? ( K = 39 )

TestHub · Accepted Answer

Maximum moles of Cl⁻: Moles = 53.5 g / m o l 0.214 g ​ = 0.004 m o l , which requires 0.004 m o l of AgNO₃. Mass of AgNO₃ needed: Mass = 0.004 m o l × 170 g / m o l = 0.68 g . Mass of 5% solution: Mass of solution = 0.05 0.68 g ​ = 13.6 g . Minimum volume needed: Volume = De n s i t y M a ss ​ = 1.02 g / m L 13.6 g ​ = 13.33mL

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