Calcium carbonate is in eggshells, seashells, a rock called marble, and in antacid tablets like Tums and Rolaids. In this activity, you can use a common liquid to detect calcium carbonate! Cover your ...

antacid brands, Tums included, making them readily accessible. Once ingested, it doesn't take long for Tums to start working.

In fact, your first line of defense should probably be these chewable antacids made from calcium carbonate (sometimes ...