Question

How can i balance Na + Ca2+ --> Ca + Na+

Answer 1

Answer:

$2Na + Ca^{2+} \rightarrow Ca + 2Na^+$

Explanation:

Hello!

In this case, since this a reaction in which the oxidation state of the metals is changing, we need to apply a redox method for which:

$Na\rightarrow Na^++e^-\\\\Ca^{2+}\rightarrow Ca+2e^-\\\\\\2Na\rightarrow 2Na^++2e^-\\\\Ca^{2+}\rightarrow Ca+2e^-$

Thus, the result is:

$2Na + Ca^{2+} \rightarrow Ca + 2Na^+$

Regards!