Trisha was studying an unknown solution. She poured 3 drops of the solution into a red litmus paper, but it did not change color. Which is TRUE about the solution?a.It has a pH of exactly 14.b.It has a pH of more than 7.c.It has a pH of less than 7.d.It has a pH of exactly 7.

The correct answer is d. It has a pH of exactly 7.

Here's why:

Litmus paper is a pH indicator used to test materials for acidity. Blue litmus paper turns red under acidic conditions and red litmus paper turns blue under basic or alkaline conditions.

In Trisha's case, the red litmus paper did not change color when she added the unknown solution. This means that the solution is not basic or alkaline, because if it were, the red litmus paper would have turned blue.

Since the solution did not turn the red litmus paper blue, it means that the solution is not basic and therefore does not have a pH of more than 7 (option b).

Similarly, if the solution were acidic (with a pH of less than 7), it would have turned blue litmus paper red. But since we're dealing with red litmus paper in this scenario, we can't definitively rule out option c based on the information given.

However, since the solution did not change the color of the red litmus paper, it is safe to say that the solution is neutral, with a pH of exactly 7 (option d).

Option a can be ruled out because a solution with a pH of exactly 14 would be highly basic or alkaline and would have turned the red litmus paper blue.

So, based on the behavior of the solution with the red litmus paper, the most accurate statement is that the solution has a pH of exactly 7.