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Copper containing alloy weighing 0.3175g dissolved in an acid, and an excess of KI is added.
Estimation of copper in alloy is based on following reactions:
Estimation of copper in alloy is based on following reactions:
- a)Iodometry
- b)Iodimetry
- c)Colorimetry
- d)Gravimetry.
Correct answer is option 'A'. Can you explain this answer?
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Copper containing alloy weighing 0.3175g dissolved in an acid, and an ...
Iodometric determination of copper is based on the oxidation of iodides to iodine by copper (II) ions, which get reduced to Cu+.
Comparison of standard potentials for both half reactions (Cu2+/Cu+ E0=0.17 V, I2/I- E0=0.54 V) suggests that it is iodine that should be acting as oxidizer. However, that's not the case, as copper (I) iodide CuI is very weakly soluble (Ksp = 10-12). That means concentration of Cu+ in the solution is very low and the standard potential of the half reaction Cu2+/Cu+ in the presence of iodides is much higher (around 0.88 V)
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Copper containing alloy weighing 0.3175g dissolved in an acid, and an ...
Estimation of Cu is done by titrating the evolved I2 with Thiosulphate. This is Iodometric Titration.
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Copper containing alloy weighing 0.3175g dissolved in an acid, and an excess of KI is added.Estimation of copper in alloy is based on following reactions:a)Iodometryb)Iodimetryc)Colorimetryd)Gravimetry.Correct answer is option 'A'. Can you explain this answer?
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