柠檬酸钠

Description

citric acid, sodium salt · CAS 994-36-5 · C6H5Na3O7. UNII RS7A450LGA. Melting Point: 300; Melting Point: >300 °C; Solubility: 29.4g/L.

Identification

CAS Registry Number	994-36-5
PubChem CID	6224
Molecular formula	C6H5Na3O7
IUPAC name	trisodium;2-hydroxypropane-1,2,3-tricarboxylate
UNII (FDA)	RS7A450LGA
FEMA number	3026

Computed Descriptors

Molecular Weight	258.07
Hydrogen Bond Donor Count	1
Hydrogen Bond Acceptor Count	7
Rotatable Bond Count	2
Exact Mass	257.97283534
Monoisotopic Mass	257.97283534
Topological Polar Surface Area	141
Heavy Atom Count	16
Formal Charge	0
Complexity	211

Physical & Chemical Properties

Melting Point	300
Melting Point	>300 °C
Solubility	29.4g/L

Physical description & handling notes

• CBI; Large Crystals; Other Solid; Dry Powder; Liquid
• Crystalline white powder or colourless crystals
• White solid; [ICSC]
• White odorless solid; [JECFA] White crystalline powder; [Alfa Aesar MSDS]
• WHITE GRANULES OR POWDER.
• BP: Decomposes at red heat /Dihydrate/

Regulatory Status

Regulatory & Food Contact

FDA Substance added to food: COLOR OR COLORING ADJUNCT, EMULSIFIER OR EMULSIFIER SALT, FLAVORING AGENT OR ADJ FDA Inventory of Food Contact Substances Listed in 21 CFR: FCS ACIDITY_REGULATOR; SEQUESTRANT; STABILIZER: Food Additives COLOR OR COLORING ADJUNCT, EMULSIFIER OR EMULSIFIER SALT, FLAVORING AGENT OR ADJUVANT, MALTING OR FERMENTING A NOT LIMITED ("Not specified") NMRS 53/TRS 539-JECFA 17/35

GHS notification summary

94.3% (1117 / 1184)

GHS Hazard Classification

GHS notification summary	94.3% (1117 / 1184)
Reported hazard statements	H319 (72.3%)

Documented Uses

• Used as an emulsifier, acidulant, sequestrant, medication (expectorant, systemic alkalizer, diuretic, sudorific, and anticoagulant), and general purpose additive for foods; Also used in photography, detergents, and electroplating and to remove sulfur dioxide from smelter waste gases; [HSDB]
• Electroplating [Category: Plate]
• Photographic Processing [Category: Other]
• AS A PHARMACEUTIC AID, SODIUM CITRATE IS USED TO PREVENT DARKENING WHEN IRON IS ADDED TO PREPARATIONS CONTAINING TANNIN.
• OFFICIALLY RECOGNIZED ONLY FOR ITS USE AS A BLOOD ANTICOAGULANT FOR BLOOD OR PLASMA THAT IS TO BE FRACTIONATED OR FOR BLOOD THAT IS TO BE STORED. THE ANTICOAGULANT EFFECT IS DUE TO THE CONVERSION OF IONIZED CALCIUM IN THE BLOOD TO NONIONIZED CALCIUM CITRATE.
• SODIUM CITRATE IS USED TO PREVENT THE CURDLING OF MILK BY RENNIN, & IS USED FOR THIS PRUPOSE TO ALTER COW'S MILK IN THE FEEDING OF INFANTS SO THAT LARGE HARD CURDS ARE NOT FORMED IN THE STOMACH... 100 MG MAY BE ADDED TO EACH 30 ML OF MILK.

Synonyms

Sodium citrate; 68-04-2; TRISODIUM CITRATE; Natrocitral; Citrosodine; Citric acid, trisodium salt; Trisodium citrate, anhydrous; sodium citrate, anhydrous; Citnatin; Citrosodina; Citrosodna; Citreme; trisodium-citrate; anhydrous sodium citrate; Anhydrous trisodium citrate; Trisodium citrate anhydrous

Frequently Asked Questions

What are the CAS number and molecular formula of citric acid, sodium salt?

CAS 994-36-5; molecular formula C6H5Na3O7; molecular weight — g/mol.

What other names is citric acid, sodium salt known by?

Sodium citrate, 68-04-2, TRISODIUM CITRATE, Natrocitral, Citrosodine, Citric acid, trisodium salt.

What is the regulatory status of citric acid, sodium salt?

Documented regulatory listings: FDA Substance added to food: COLOR OR COLORING ADJUNCT, EMULSIFIER OR EMULSIFIER SALT, FLAVORING AGENT OR ADJ; FDA Inventory of Food Contact Substances Listed in 21 CFR: FCS; ACIDITY_REGULATOR; SEQUESTRANT; STABILIZER: Food Additives.

Is citric acid, sodium salt classified as hazardous?

94.3% of GHS notifications report no hazard classification (1117 of 1184).

What are the key physical properties of citric acid, sodium salt?

Melting Point: 300; Melting Point: >300 °C; Solubility: 29.4g/L.

Facts on this page are taken from PubChem (US National Library of Medicine) and Wikidata. Grade-specific data — assay, moisture, particle size, packaging, shelf life — is issued per batch on the COA and is not published here.