As it stands now, there is 1 Na on the left but 2 Na's on the right. In order for this equation to be balanced, there must be an equal amount of Na on the left hand side as on the right hand side. Hydrogen and oxygen are usually balanced last. Generally, it is best to balance the most complicated molecule first. Simple chemical equations can be balanced by inspection, that is, by trial and error. Also in case of net ionic reactions the same charge must be present on both sides of the hiddly unbalanced equation, one may balance it by changing the scalar number for each molecular formula. Thus, each side of the equation must represent the same quantity of any particular element. In a chemical reaction, the quantity of each element does not change. Different symbols are used to connect the reactants and products with the following meanings: = for a stoichiometric relation → for a net forward reaction ⇆ for a reaction in both directions ⇌ for equilibriumįor example, the combustion of methane (in oxygen) is depicted as:
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