Question

Using a straw to blow into the bromothymol blue solution eventually turns the solution a green color. What gas is being blown into the solution that causes it to turn green?(1 point)
Responses

A. nitrogen

B. fossil fuels

C. oxygen

D. carbon dioxide

Answer 1

The gas being blown into the bromothymol blue solution that causes it to turn green is **D. carbon dioxide**. When carbon dioxide is added to the solution, it reacts with water to form carbonic acid, which lowers the pH and changes the color of the bromothymol blue from blue to green.