Holly has an unknown substance in a beaker. She wants to determine the relative pH of the unknown substance. She places a piece of blue litmus paper into the substance, and the litmus paper stays blue. The substance in the beaker A. is a base. B. has a neutral pH. C. is an acid. D. does not have a pH.

The correct answer is B has a neutral pH

Explanation:

we all know that acid converts blue litmus to red on the other hand base converts red litmus paper to blue.

According to the question the blue litmus paper does not change its colour or it stays blue that means the pH of solution is neutral or7 which prevent the colour change of the litmus paper.

If the solution was acidic then the blue litmus paper changes into red.