Sodium citrate dihydrate

CAS Number
6132-04-3
EC Number
200-675-3
FEMA Number
FEMA 3026

What is Sodium citrate dihydrate?

Sodium citrate dihydrate (CAS 6132-04-3), also known as trisodium citrate dihydrate, is the crystalline hydrated form of sodium citrate.

Where is Sodium citrate dihydrate used?

  • Food and beverage: emulsifying salt in processed cheese and buffering agent in carbonated drinks, sports beverages and gelatin-based products
  • Pharmaceuticals: stabiliser of anticoagulant solutions, oral medications and effervescent tablets
  • Personal care: pH adjuster in creams, shampoos and cleansing products and chelator of trace metals
  • Water treatment: sequestrant controlling scaling and component of cleaning-in-place (CIP) formulations
  • It functions as a buffering agent, pH regulator and sequestrant that binds metal ions.

Good to know: Technical grade is available where pharmacopeial certification is not required.

Commercial specifications

  • Standard grades: FCC, USP, BP and Ph. Eur.

Other Names (Synonyms)

sodium citrate hydrate|2-hydroxy-1,2,3-propanetricarboxylic acid trisodium salt dihydrate|Trisodium citrate dihydrate|Sodium citrate hydrous|B22547B95K|Citric acid, trisodium salt, dihydrate|Nauzene|1,2,3-Propanetricarboxylic acid, 2-hydroxy-, sodium salt, hydrate (1:3:2)

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What are the physical properties of Sodium citrate dihydrate?

Melting Point 150 °C (decomp)
Density 1.76
Flash Point 173.9 °C
Appearance white powder or colourless crystals
Color white
Odor Odorless
Form powder
Water Solubility 720 g/L (25 ºC)
pH 7.0-9.0 (25℃, 50mg/mL in H2O)
Log P -1.72

Which trade and regulatory codes apply to Sodium citrate dihydrate?

HS Code 29181500
Storage Class 11 - Combustible Solids
WGK (Germany) 1
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