The official mild alkaline salts of these ions are:

Potassium bicarbonate (Khco3), soluble in 3 parts of water.

Potassium carbonate (K2Co3), "salts of tartar," soluble in 0.91 part of water.

Sodium bicarbonate (NaHco3), "baking soda," soluble in 12 parts of water.

Monohydrated sodium carbonate (Na2Co3+H2O), dried sodium carbonate, soluble in 3 parts of water. Washing-soda is crystalline sodium carbonate (Na2Co3+10H2O). Both are rather irritating to the tissues.

Lithium carbonate (Li2Co3), soluble in 75 parts of water.

All these salts are insoluble in alcohol. In aqueous solution the bicarbonates slowly change to carbonate by loss of carbon dioxide. When heated, they change more rapidly, hence any liquid containing sodium or any other bicarbonate should not be boiled.