Monosodium Phosphate
NaH₂PO₄ | CAS: 7558-80-7 | HS: 28352200
Product Description
Monosodium Phosphate (MSP, Sodium Dihydrogen Phosphate, NaH₂PO₄) is a water-soluble phosphate salt that functions as an acidulant, buffering agent, and emulsifier across food, pharmaceutical, and industrial applications. In food (E339i), it acts as an acidity regulator and leavening acid in baking powders. In pharmaceutical applications, it is used in buffer systems (often paired with disodium phosphate) to maintain physiological pH in ophthalmic, parenteral, and oral drug formulations. In industrial water treatment, MSP is dosed into boiler feedwater to precipitate calcium hardness as calcium hydroxyapatite — a controlled sludge that is easier to remove than scale. MITCHEM supplies anhydrous and monohydrate forms in both food/pharma and industrial grades.
Applications by Industry
Acidity regulator and leavening acid in baked goods, soft drinks, and processed foods; used in instant soup mixes, powdered beverages, and as a pH control agent in food emulsions.
Component of standard sodium phosphate buffer (pH 5.0–8.0) in IV fluids, eye drops, nasal sprays, and oral liquid formulations; USP/BP grade required for parenteral preparations.
Dosed into boiler feedwater to precipitate calcium as non-adherent hydroxyapatite sludge (coordinated phosphate treatment), preventing hard calcium carbonate scale on boiler surfaces.
pH buffer and sequestrant in liquid cleaning formulations; prevents alkaline hydrolysis of surfactants and sequesters calcium and magnesium to maintain cleaning efficiency in hard water.