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A sample of soil is mixed with water and...

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

Text Solution

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The correct Answer is:
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 . Other options (a) and (b) contain acids and option (c ) is a neutral salt.
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