Discussion
Arrange the following substances in increasing order of their pH value :
(1) Gastric Juice
(2) Milk of Magnesia
(3) Lemon Juice
(4) Pure Water
Choose the correct answer from the options given below :
Answer: D
In increasing order of pH the answer is (1), (3), (4), (2).
- Gastric juice: pH about 1.5-2, due to hydrochloric acid.
- Lemon juice: pH about 2-2.5, due to citric acid.
- Pure water: neutral, pH 7 at 25°C.
- Milk of magnesia (magnesium hydroxide suspension): basic, pH about 10.5.
Gastric juice is more acidic than lemon juice, so it comes first. Milk of magnesia, an antacid, is the only base and comes last.
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