Hydrogencarbonate

Ammonium bicarbonate, a compound with formula NH4(C(=O)OHO), also called bicarbonate of ammonia, ammonium hydrogen carbonate, hartshorn, or powdered baking ammonia, is the bicarbonate salt of ammonia.

Calcium bicarbonate (Ca(HCO₃)₂), also called calcium hydrogen carbonate, does not refer to a known solid compound; it exists only in aqueous solution containing the ions calcium (Ca₂+), dissolved carbon dioxide (CO₂), bicarbonate (HCO₃–), and carbonate (CO₃₂–).

Potassium bicarbonate (also known as potassium hydrogen carbonate or potassium acid carbonate), is a colorless, odorless, slightly basic, salty substance.

Sodium bicarbonate or sodium hydrogen carbonate is the chemical compound with the formula NaHCO₃. Sodium bicarbonate is a white solid that is crystalline but often appears as a fine powder.