Question

You are given the reaction Cu HNO3 Right arrow. Cu(NO3)2 NO H2O. Which element is oxidized? Which element is reduced?.

Answer 1

In the given reaction, the Copper(Cu) element is getting oxidized and the Nitrogen(N) element is getting reduced.

What is a redox reaction?

Any chemical reaction in which the oxidation number of a participating chemical species changes is called a redox reaction. Redox reaction is also called oxidation-reduction reaction. The formation of hydrogen fluoride is an example of a redox reaction.

The given reaction occurs as

$\rm Cu+HNO_3 \rightarrow Cu(NO_3)_2 + NO + H_2O$

The given reaction is an example of a redox reaction.

A balanced chemical equation is:

$\rm 3Cu+8HNO_3 \rightarrow 3Cu(NO_3)_2 + 2NO + 4H_2O$

Now, we write the oxidation number of chemical species involved in the reaction as

$\rm3 \overset{0}Cu + 8\overset{+1}H\overset{+5}N\overset{-2}{O_3} \rightarrow 3\overset{+2}Cu(NO_3)_2 + 2\overset{+2}NO + 4H_2O$

From the above reaction, we can say that,

the oxidation number of the copper element(Cu) increases from $0 \to +2$

the oxidation number of the nitrogen element(N) decreases from $+5\to+2$

We know that,

Oxidation: increase in oxidation number

Reduction: decrease in oxidation number

So, from the above, we can conclude that, in the given reaction, the copper element(Cu) is getting oxidized and the nitrogen element(N) is getting reduced.

To learn more about redox reactions, click here:

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