pH Indicators

Front

What is a pH indicator?

Back

A pH indicator is a substance that changes color in response to changes in pH, helping to determine whether a solution is acidic, neutral, or basic.

Front

What color does Thymol Blue turn in a neutral solution (pH 7)?

Back

Yellow.

Front

What color does litmus paper turn in an acidic solution?

Back

Red.

Front

What is the pH range of acidic solutions?

Back

pH less than 7.

Front

What is the pH of pure water?

Back

7, which is considered neutral.

Front

What color does phenolphthalein turn in a basic solution?

Back

Pink.

Front

Which solution would turn blue litmus paper red?

Back

HCl (Hydrochloric acid).

Front

What is the most acidic pH value among the following: 6.7, 2.0, 8.0, 7.3?

Back

2.0.

Front

What color does litmus paper turn in a basic solution?

Back

Blue.

Front

What is the pH range of basic solutions?

Back

pH greater than 7.