Question

Any possible titration determination (with indicator if needed) for Cu ion in a solution?

Not CuS please, gravimetric method works poorly for colloidal precipitate.

Answer 1

Iodometric titration can be used for the determination of Cu in solution. In this titration, Cu is reduced by iodide ion which itself get oxidized to iodine. Here starch is used as indicator which form complex with iodine to give blue Color solution. This blue solution is then titrated with thiosulphate solution until blue Color disappeared.

2Cu²⁺ + 4l^- right arrow I₂ + 2Cul

I₂ + 2S₂O₃^2- right arrow S4O₆²- + 2I^-

^{Reaction give best result at slightly acidic pH and thus ammonia and acetic acid is added.}

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