Question

a student tests two solutions with the same acid - base indicator. if the two solutions have different hydroxide ion concentrations, which would you expect to be true?
the two solutions will have identical hydrogen ion concentrations.
the indicator will be the same color in both solutions.
the indicator will have different colors in the different solutions.
the two solutions will react to produce a salt and water.

Explanation:

Acid - base indicators change color depending on the pH of the solution, which is related to the hydroxide - ion concentration. Different hydroxide - ion concentrations mean different pH values, so the indicator will show different colors. Also, different hydroxide - ion concentrations do not imply identical hydrogen - ion concentrations, and there is no information suggesting the two solutions will react to form a salt and water.

Answer:

The indicator will have different colors in the different solutions.