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Q51 (NDA-II/2021) Science & Technology › Basic Science (Physics, Chemistry, Biology) › Applied everyday chemistry

The pH value of Milk of Magnesia is approximately

Result
Your answer: —  Â·  Correct: C
Explanation

Milk of Magnesia is a common name for an aqueous suspension of magnesium hydroxide [Mg(OH)2], which is widely used as an antacid and laxative. Chemically, it is a basic (alkaline) compound that works by neutralizing excess hydrochloric acid in the stomach to form magnesium chloride and water. On the pH scale, which ranges from 0 to 14, substances with a pH greater than 7 are classified as basic. Specifically, an aqueous slurry or suspension of magnesium hydroxide typically produces a pH value of approximately 10 to 10.5 [1]. This alkalinity is sufficient to neutralize weak acids effectively without being as caustic as stronger bases. Therefore, among the given options, 10 is the most accurate approximate pH value for Milk of Magnesia.

Sources

  1. [1] https://www.sciencedirect.com/topics/neuroscience/magnesium-hydroxide
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