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Question

Describe the oxidising action of potassium dichromate and write the ionic equations for its reaction with

(i) Iodide

(ii) Iron

(iii) H2S


Solution

Potassium dichromate is a strong oxidising agent. In acidic solution, its oxidising action may be represented as:
Cr2O27+14H++6e2Cr3++7H2O(E=1.33V)
Ionic Equations
Reaction of K2Cr2O7 with I
Cr2O27+14H++6I2Cr3++3I2+7H2O

Potassium dichromate is a strong oxidising agent. In acidic solution, its oxidising action may be represented as:

Cr2O27+14H++6e2Cr3++7H2O(E=1.33V)

Ionic Equations
Reaction of K2Cr2O7 with Fe2+(aq)
Cr2O27+14H++6Fe2+2Cr3++6Fe3++7H2O

Potassium dichromate is a strong oxidising agent. In acidic solution, its oxidising action may be represented as:
Cr2O27+14H++6e2Cr3++7H2O(E=1.33V)

Ionic Equations
Reaction of K2Cr2O7 with H2S
Cr2O27+8H++3H2S2Cr3++3S+7H2O

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