How C02 Affect 😍     #Chemistry #chemistrynotes #science #scienceproject #Science
Channel: Scientific Talk
Date: 2022-09-30

The activity shows how CO2 from the atmosphere dissolves in bodies of water and affects the ocean. A lit wooden stick, produce carbon dioxide above the surface of water (with bromothymol blue solution).

When shaking the flask, CO2 is quickly absorbed by the water. This can be revealed by the change of colour of the pH indicator bromothimol blue, which will turn the solution from blue to green, as CO2 is slightly acidic (see also previous post).

In real life, this is a slow process. To illustrate this, we could repeat the activity without shaking and leave the stoppered flask at rest for several hours to see the colour change when CO2 is absorbed.