Question

how does bromothymol blue serve as an indicator in the experiment? it measures the rate of co₂ production. it measures the rate of oxygen production. it measures the rate of salt concentration. it measures the rate of sugar concentration.

Explanation:

Bromothymol blue is a pH - sensitive indicator. Carbon dioxide dissolves in water to form carbonic acid, changing the pH. So it can measure the rate of CO₂ production by showing pH - related color changes.

Answer:

It measures the rate of CO₂ production.