How would you balance the following equation: Na2CO3 + BaCl2 --> NaCl + BaCO3?

Nov 9, 2015

$N {a}_{2} C {O}_{3} + B a C {l}_{2} \to 2 N a C l + B a C {O}_{3}$

Explanation:

It is important to notice that the $C {O}_{3}^{2 -}$ is a polyatomic ion, known as the carbonate ion. When balancing equations with polyatomic ions you can consider them to be a single entity.

On the reactant side you have:
2 $N a$
1 $C {O}_{3}$ ion
1 $B a$
2 $C l$

By placing 2 moles on the product side you conserve the mass of both $N a$ and $C l$.

Since there is one $C {O}_{3}$ ion and one$B a$ you don't need to worry about their stoiciometric coefficient.