Why do the minerals calcite and dolomite bubble with the mineral or its powder are placed in hydrochloric acid?
◦ Both minerals are sulfides, and the acid reacts to release sulfur dioxide gas.
◦ The acid reacts with the mineral to release CO2 gas that is bound into the crystal as carbonate ion.
◦ Both minerals are metal hydrides, and when placed in hydrochloric acid they give off hydrogen gas.
◦ The acid and the mineral together react with oxygen in the air, releasing CO2 gas.