Continuing our new series of chemical recipes, we bring you week 3 – bicarbonate indicator (HCO3).
Remember that when preparing any of our recipes, you should always wear appropriate PPE.
What is a bicarbonate indicator?
Also known as hydrogencarbonate indicator, this sensitive pH indicator is used within photosynthesis and respiration experiments to show the concentration of carbon dioxide within a liquid – as the level of carbon dioxide changes, the colour will also.
The initial cherry red colour will change to yellow if the carbon dioxide content exceeds 0.04% and pink/purple when it drops below 0.04%.
Scan the QR codes for classroom experiments to follow with your safe and prepared bicarbonate indicator.