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This reaction involves a base (NaOH) and an acid (HCl), so it's a neutralization reaction, which is a special type of double-displacement reaction. Follow this procedure to write balanced molecular equations for double displacement reactions, when you know only the formulas of the reactants:
What is the reaction of Na + H2O? Sodium metal reacts with water to form hydrogen gas and sodium hydroxide in an exothermic reaction. Exothermic reactions produce heat, and the sodium and water reaction produces enough heat to cause the hydrogen gas and the sodium metal to ignite.