# How would you balance the following equation: Ca+HNO3 --> Ca(NO3)2+ N2O3+ H2O?

##### 1 Answer

By the method of half-equations: calcium metal is oxidized, and nitrogen is reduced.

#### Explanation:

Oxidation:

Reduction:

Note that dinitrogen trioxide is a metastable species, and is a mixed valence oxide of

Both

Since the source of

Is this last equation balanced with respect to mass and charge? Do not trust my arithmetic!