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Henderson Hassleback Equation

A sample of s...

Question

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

An antacid

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B

Vinegar

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C

Common salt

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D

Lemon juice

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Solution

The correct option is A
An antacid

Yellowish orange colour on pH paper is shown by acidic substances hence to change the colour of pH paper to greenish blue (pH = 8), an antacid should be added since antacids are basic in nature.

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