How do you balance #NaClO_3 -> NaCl + O_2#?
To balance the reaction, if it is happening at the solid state (decomposition):
However, to balance the reaction, if it is happening in aqueous medium:
We should recognize that this is a reduction half equation since the oxidation number of oxygen is increasing from
The oxidation numbers for
To balance this reaction then:
Therefore, in order for this reaction to occur, you will need a reducing agent which will reduce the oxidizing agent
The oxidation half equation will then be:
The redox reaction will thus be:
Here is a video that explains how to balance a redox reaction in acidic medium:
Balancing Redox Reactions | Acidic Medium.
And here is another one on how to balance a redox reaction in basic medium:
Balancing Redox Reactions | Basic Medium.