Where can I buy Calcium Carbonate suitable for an AS level chemistry coursework experiment?

Question

I'm doing Chemistry AS level as a private candidate and need to do an experiment at home in order to complete my coursework. Where can I buy Calcium Carbonate to do this?

Answer 1

Try your local chemist. Its commonly used as a calcium supplement or antacid.

Answer 2

Would the two different possible pathways give different amounts of gas per gram of starting material? If so, why? How could you set up your apparatus to measure the volume of gas evolved? (it sounds as if you are certainly on the right track here) Going a little bit beyond the question, can you think of a way of absorbing the carbon dioxide gas formed, seeing if any other gas is formed at the same time, and testing to see if it is oxygen?

Answer 3

I actually saw some yesterday at a CVS pharmacy.

Answer 4

It is just powdered chalk. Should be easy to find.