Question

What is the chemical substance used to test carbon dioxide​

Answer 1

Limewater or calcium hydroxide.

Step-by-step explanation:

Limewater is a solution of calcium hydroxide. CO2 is bubbled through limewater, the solution turns cloudy.

Answer 2

Limewater is a solution of calcium hydroxide. If carbon dioxide is bubbled through limewater, the limewater turns milky or cloudy white.

Step-by-step explanation:

yea