In the above equation, the reactants (hydrochloric acid and sodium hydroxide) and the products of the reaction (sodium chloride and water) are shown by their formulae HCl, NaOH, NaCl and H 2O respectively. It shows the direction of the reaction the state of matter in which the reactants and products are present.įor example, the chemical reaction between aqueous solution of hydrochloric acid and aqueous solution of sodium hydroxide that leads to the formation of sodium chloride and water can be expressed by the equation: It shows the chemical formulae of the reactants and the products, the mole ratios by which the reactants combine, as well as the mole ratios by which the products are formed. A chemical equation is the symbolic representation of a chemical reaction.
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