Question

1. You put 1 mL of CoH4 into a test tube with 1 mL of KI (aq). Then you add a small amount of a metal salt, MNO, (aq), and shake the mixture. (a) If the M reacts with, and oxidizes the I, what colour would the CoHi4 be? Explain and give any relevant reactions. (1 mark) (b) What colour would the CoHi4 be if the M does not react with the I? Explain (1 mark)

Voltaic Cells, And the nernst equation

I have already got the ans for the question 1. Please solve the question 2 for me. Thank you.

1. You put 1 mL of CoH4 into a test tube with 1 mL of KI (aq). Then you add a small amount of a metal salt, MNO, (aq), and shake the mixture. (a) If the M reacts with, and oxidizes the I, what colour would the CoHi4 be? Explain and give any relevant reactions. (1 mark) (b) What colour would the CoHi4 be if the M does not react with the I? Explain (1 mark)

Answer 1

(a) 2 MNO3 + 2 KI => 2 M + I2 + 2 KNO3

or 2 M+ + 2 I- => 2 M + I2

The I- is oxidized to I2 (iodine), which dissolves in the C6H14 and turns it purple/violet.

(b) The C6H14 will be colorless if there is no reaction. This is because both I- and M+ are ionic, colorless, insoluble in C6H14 and remain in the aqueous layer.

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