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Litmus paper changes its color depending on the pH of the solution or the substance and pH is a measure of the concentration of hydrogen ions of the substance. Turning blue litmus to pink signifies that the solution is an acid. Therefore, the correct answer among the choices given is option A. A pH of 3.4 will change blue litmus paper to red.

Answer:

a. 3.4

Explanation:

Blue litmus paper turns red under acidic conditions, that happens when pH of the solution goes below 4.5. Litmus paper is one of the oldest pH indicator, used to test materials for acidity.

Blue litmus does not change color under alkakine conditions, while red litmus paper does not change color under acidic conditions. Neutral litmus paper is purplish in color.

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