Question

why pure acetic acid doesnot turn blue litmus to red

Answer 1

IT IS A WEAK ACID SINCE  FEWER H30+IONS ARE PRESENT. THEREFORE IT DOES NOT TURN BLUE LITMUS PAPER TO READ.
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Answer 2

Pure Acetic acid is very weak acid that's why it does not turn blue litmus to red.

Explanation:

Litmus Paper:- It is a type of paper that changes colour in response to the acidity of the solution when it is dipped in it.

• Acid turns blue litmus to red.
• Base turns red litmus to blue.

Pure acetic solution turns blue litmus to red :-

• Pure Acetic acid is very weak acid.
• It does not dissociate completely.
• it doesn't have enough [H+] concentration, so it can't turn blue litmus red.