![]() ![]() What does it mean to be balanced? It means that the law of conservation of mass is obeyed. We can’t change the subscripts (for example, we can’t change the 2 in H 2O).Every chemical equations must be balanced. To fix this, we can change the coefficients that come before the molecules. There is a problem, because the left side has 2 hydrogen atoms but the right side has 3. This is known as the law of conservation of mass: matter cannot be created or destroyed.Īs an example, let’s look at the unbalanced reaction of water (H 2O) with sodium (Na): We have to make sure that the reactant and product sides have identical amounts of atoms – for example, if we react molecules containing 2 atoms of hydrogen then we must produce molecules that have 2 atoms of hydrogen as well.
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