GIPHOTOSTOCK / SCIENCE PHOTO LIBRARY GIPHOTOSTOCK / SCIENCE PHOTO LIBRARY
Neutralizing an acid, 2 of 2. Milk of magnesia, a milky white suspension of magnesium hydroxide (Mg (OH)2) in water, is added to a beaker with 0.1 M solution of hydrochloric acid (HCl). The solution has few drops of methyl orange indicator added. Initially colour is red, indicating an acidic solution (Photo 1). When milk of magnesia dissolves, it reacts with the acid. Solution colour turns yellow, indicating that acid has been neutralized (Photo 2). The reaction is HCl + Mg (OH)2 -> MgCl2 + H2O. Milk of magnesia is used medicinally as an antacid, to neutralize gastric acid (contains 0.5-1% of hydrochloric acid).
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