The difference between gypsum and lime
Calcium carbonate CaCO3 can react with hydrochloric acid to produce bubbles and form gas CO2.
Lime is CaO calcium oxide, calcium hydroxide in water to generate lime, calcium hydroxide is Ca (OH) 2, alkaline, drops of phenolphthalein solution is red
Gypsum is hydrated calcium sulfate CaSO4 = 2H2O, and the gypsum is anhydrous calcium sulfate 2CaSO4 = H2O, which is neutral
