Question

A solution of potassium sulfite is added dropwise to aqueous KIO4. There is no color change at first (Why?), but on continued addition of sulfite, a black precipitate forms. As more sulfite is added, the precipitate dissolves to give a brown solution, and the solution eventually becomes colorless

Write 4 balanced reactions equations which are happening sequentially but related to each other​

Answer 1

Answer:

Copper sulphate reacts with potassium iodide to form cuprous iodide and iodine.

2CuSO

4

+4KI→Cu

2

I

2

↓+I

2

+2K

2

SO

4

Thus, CuI

2

is not formed in this reaction.

Hence, the option B is incorrect and option A is correct.

The liberated iodine is titrated with sodium thiosulphate to form sodium tetrathionate.

2Na

2

S

2

O

3

+I

2

→Na

2

S

4

O

6

+2NaI

Iodine is reduced and sodium thiosulphate is oxidized.

Explanation:

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