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Sodium reacting with water. Chemical reaction between sodium (Na) metal and water (H2O). The reaction gives off hydrogen (H) gas bubbles and produces a solution of sodium hydroxide (NaOH), a strong alkali. The equation for this reaction is: 2Na + 2H20 ----> 2NaOH + H2. (KEYSTONE/SCIENCE PHOTO LIBRARY/ANDREW LAMBERT PHOTOGRAPHY)