sesquicarbonate

Sesquicarbonate is a term sometimes used to refer to sodium sesquicarbonate, a chemical compound with the formula Na3H(CO3)2. This compound is a mixed carbonate and bicarbonate salt of sodium. It is also known as sodium sesquicarbonate dihydrate when it crystallizes with two molecules of water, Na3H(CO3)2·2H2O. Naturally occurring sources of sodium sesquicarbonate include the mineral trona.

Sodium sesquicarbonate exhibits a number of useful properties. It is a mild alkali, meaning it is less caustic than pure sodium carbonate (soda ash) but still effective for cleaning and pH adjustment. Its ability to buffer pH makes it valuable in various applications. In laundry detergents, it acts as a water softener and a builder, enhancing the cleaning power of surfactants by reducing water hardness. It can also be found in some bath products, where it is valued for its effervescent qualities and potential to soften water. Furthermore, it has uses in the textile industry and as a component in some industrial cleaning formulations.