Monosodium phosphate
Template:Chembox Monosodium phosphate (MSP), also known as monobasic sodium phosphate and sodium dihydrogen phosphate, is an inorganic compound with the chemical formula Template:Chem2. It is a sodium salt of phosphoric acid. It consists of sodium cations (Template:Chem2) and dihydrogen phosphate anions (Template:Chem2). One of many sodium phosphates, it is a common industrial chemical. The salt exists in an anhydrous form, as well as monohydrate and dihydrate (Template:Chem2 and Template:Chem2 respectively).[1]
Production and reactions
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).[2]
Heating this salt above 169 °C gives disodium pyrophosphate:
When heated at 550 °C, anhydrous trisodium trimetaphosphate is formed:[3]
Uses
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.[1] It is added in animal feed for its nutritional value.[1]
References
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- ↑ a b c Template:Ullmann
- ↑ Salaun, F.: "Influence of mineral environment on the buffering capacity of casein micelles" Template:Webarchive, "Milchwissenschaft", 62(1):3
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