Calcium carbonate is in eggshells, seashells, a rock called marble ... Place the crushed eggshell and antacid tablet in a piece of paper. Place 1 Tablespoon of water and 1 Tablespoon of vinegar in ...
Hard water is the term used for water with a high proportion of calcium and magnesium (2 plus) ions. The calcium usually enters the water as it flows past either calcium carbonate, from limestone and ...