IGNOU MCH 1 2018 - Explain with a suitable graph the titration of “Iodide-Chloride

Question

Explain with a suitable graph the titration of “Iodide-Chloride mixture with Silver ion”. Discuss the factors on which the sharpness of end point depend.

08 Mar 2018

Answer :

Word Count : 485

When two different ions react with the same ion of opposite charge to form two different salts with greatly different Ksp , the two ions give a precipitation titration curve with two different equivalence points, much like a mixture of strong and weak monoprotic acids titrated with base. This is best illustrated for a mixture of I – (K AgI = 1.00.10 –16 ) and Cl – (K AgCl = 1.82.10 –10 ) titrated with AgNO 3 . Consider the titration with 0.1000 M AgNO 3 of a solution that is 0.01000 M in both I – and Cl – . Since AgI has a much lower solubility than AgCl, the initial reaction that occurs as Ag + is first added as Ag + + I – → AgI (s) Initially there are 1.000 mmol of

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