Hydrogencarbonate Indicator

What is Hydrogencarbonate Indicator?

A solution whose colour depends on the concentration of dissolved carbon dioxide, used to provide evidence about gas exchange. It is yellow when the carbon dioxide concentration is above atmospheric equilibrium, red or orange at atmospheric equilibrium, and purple when the carbon dioxide concentration is below it. The colour observed with a plant reflects the net balance between photosynthesis, which removes carbon dioxide, and respiration, which adds it.

This definition is part of the Plant Nutrition chapter in Cambridge O Level Biology.

Concepts related to Hydrogencarbonate Indicator

• net gas exchange
• respiration
• control
• carbon dioxide