Question

When the following equation is balanced properly under basic conditions, what are the coefficients of the species shown? Cr+ Cl2 Water appears in the balanced equation as a (reactant, product, neither) with a coefficient of (Enter 0 for neither.) Which element is reduced?

Answer 1

1)

Cl in Cl- has oxidation state of -1

Cl in Cl2 has oxidation state of 0

So, Cl in Cl- is oxidised to Cl2

I in I2 has oxidation state of 0

I in I- has oxidation state of -1

So, I in I2 is reduced to I-

Reduction half cell:

I2 + 2e- --> 2 I-

Oxidation half cell:

2 Cl- --> Cl2 + 2e-

Number of electrons is same in both half reactions.

So, balancing of electrons is not required. It's already balanced

Lets combine both the reactions.

I2 + 2 Cl- --> 2 I- + Cl2

Balance Oxygen by adding water

Oxygen is already balanced

Hydrogen is already balanced

This is balanced chemical equation in basic medium

Answer:

Coefficients are 1, 2, 2, 1

Water appear as neither with coefficient of 0

Iodine is reduced

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