A sample of soil is mixed with water and allowed to settle. Theclear supernatant solution turns the pH paper yellowish-orange.Which of the following would change the colour of this pH paperto greenish-blue?(a) Lemon juice(b) Vinegar(c) Common salt(d) An antacid
Question
A sample of soil is mixed with water and allowed to settle. Theclear supernatant solution turns the pH paper yellowish-orange.Which of the following would change the colour of this pH paperto greenish-blue?(a) Lemon juice(b) Vinegar(c) Common salt(d) An antacid
Solution
The pH paper turns yellowish-orange, which indicates that the solution is acidic. To change the colour of this pH paper to greenish-blue, which indicates a basic or alkaline solution, we need a substance that is basic in nature.
Out of the given options, lemon juice and vinegar are acidic, and common salt is neutral. An antacid, however, is basic in nature.
So, the correct answer is (d) An antacid. This would change the colour of the pH paper to greenish-blue.
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