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  • A sample of soil is mixed with water and allowed to settle. The clear supernatant solution turns the pH paper yellowish orange. Which of the following would change the colour of this pH paper to greenish-blue? (a) Lemon juice (b) Vinegar (c) Common salt

A sample of soil is mixed with water and allowed to settle. The clear supernatant solution turns the pH paper yellowish-orange. Which of the following would change the colour of this pH paper to greenish-blue?

(a) Lemon juice

(b) Vinegar

(c) Common salt

(d) An antacid

Answers (1)

Answer: (d)

As pH paper turns greenish blue for weakly basic compound and antacids contain weak base like Mg(OH)_{2}. So, an antacid would change the colour of this pH paper to greenish-blue.

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