Exothermic reaction

Exothermic reaction

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Caption: Beaker containing water and a small piece of sodium metal. Sodium, a dull soft metal, reacts strongly with water - violently, if a sufficiently large lump is used. The reaction is exothermic (heat is given out); the water surrounding the metal would hiss and splutter until the reaction dies down, and the lump of sodium may move around on the surface of the water. The strong alkali sodium hydroxide is formed by this reaction, in this case in very weak concentrations. Presence of sodium hydroxide in solution is confirmed by the addition of a few drops of an acid-base indicator, which turns the solution blue, indicating an alkali.

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Keywords: acid-base indicator, chemical, chemistry, exothermic reaction, formation o, sodium hydroxide, sodium metal

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