Quantitative analysis of Cl ion is often performed by a

Chapter 19, Problem 19.140

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Quantitative analysis of Cl ion is often performed by a titration with silver nitrate, using sodium chromate as an indicator. As standardized AgNO3 is added, both white AgCl and red Ag2CrO4 precipitate, but so long as some Cl remains, the Ag2CrO4 redissolves as the mixture is stirred. When the red color is permanent, the equivalence point has been reached. (a) Calculate the equilibrium constant for the reaction (b) Explain why the silver chromate redissolves. (c) If 25.00 cm3 of 0.1000 M NaCl is mixed with 25.00 cm3 of 0.1000 M AgNO3, what is the concentration of Ag remaining in solution? Is this sufficient to precipitate any silver chromate? 1

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