The preparation done by the lab staff at PSN is commendable. Everything was meticulously laid out, neatly in plastic containers, one for each table. We were at PSN for 2 activities.
Activity 1 - to investigate which rock contains carbon
Watch for bubbles. The bubbles would mean carbon dioxide is evolved. The acidic vinegar reacts with the carbon in the sample giving out carbon dioxide gas.
Bromothymol blue was used to indicate the acidic carbon dioxide gas. Bromothymol blue changes colour from blue to green to yellow when carbon dioxide is bubbled into it.
Science makes my boys hungry. While the other kids were busy with their test tubes, I made an exit and fed their growling tummies.