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Monosodium phosphate

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Monosodium phosphate

Monosodium phosphate (MSP), also known as monobasic sodium phosphate and sodium dihydrogen phosphate, is an inorganic compound with the chemical formula NaH2PO4. It is a sodium salt of phosphoric acid. It consists of sodium cations (Na+) and dihydrogen phosphate anions (H2PO4). One of many sodium phosphates, it is a common industrial chemical. The salt exists in an anhydrous form, as well as monohydrate and dihydrate (NaH2PO4·H2O and NaH2PO4·2H2O respectively).

The salt is obtained by partial neutralization of phosphoric acid.

The pKa of monosodium phosphate is 6.8-7.2 (depending on the physicochemical characteristics during pKa determination).

Heating this salt above 169 °C gives disodium pyrophosphate:

When heated at 550 °C, anhydrous trisodium trimetaphosphate is formed:

Phosphates are often used in foods and in water treatment. The pH of such formulations is adjusted by mixtures of various sodium phosphates, such as this salt. It is added in animal feed for its nutritional value.

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