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71635 Sigma-Aldrich

Sodium citrate dibasic sesquihydrate

purum p.a., ≥99.0% (T)

Synonym: Citric acid disodium salt, Disodium hydrogen citrate sesquihydrate

  • CAS Number 6132-05-4

  • Linear Formula HOC(COOH)(CH2COONa)2 · 1.5H2O

  • Molecular Weight 263.11

  •  Beilstein/REAXYS Number 3770069

  •  EC Number 205-623-3

  •  PubChem Substance ID 57652327



Related Categories Analytical/Chromatography, Essential Chemicals, QuEChERS Bulk Adsorbents and Salts, Research Essentials, Salts,
Quality Level   200
grade   purum p.a.
assay   ≥99.0% (T)
pH   4.6-5.2 (25 °C, 50 mg/mL in H2O)
solubility   water: soluble 263.1 g/L
anion traces   chloride (Cl-): ≤50 mg/kg
  sulfate (SO42-): ≤50 mg/kg
cation traces   Ca: ≤50 mg/kg
  Cd: ≤50 mg/kg
  Co: ≤50 mg/kg
  Cu: ≤50 mg/kg
  Fe: ≤50 mg/kg
  K: ≤100 mg/kg
  Ni: ≤50 mg/kg
  Pb: ≤50 mg/kg
  Zn: ≤50 mg/kg
SMILES string   O.O.O.[Na+].[Na+].[Na+].[Na+].OC(=O)CC(O)(CC([O-])=O)C([O-])=O.OC(=O)CC(O)(CC([O-])=O)C([O-])=O


General description

Sodium citrate dibasic sesquihydrate is a colorless crystalline sodium salt.


Sodium citrate dibasic sesquihydrate may be employed in the following studies:
• In the Supel Que Citrate (EN) tubes for the quantification of pesticides in blackcurrants by triple quadrupole GC-QqQ-MS/MS [Gas chromatography coupled to tandem mass spectrometry (GC-MS/MS) coupled with triple quadrupole (QqQ) analyzer] method.
• Dispersive solid phase extraction (dSPE) method, commonly referred as QuEChERS.2
• Preparation of RNA precipitation solution.


1 kg in poly bottle

250 g in poly bottle

Safety & Documentation

Safety Information

Personal Protective Equipment 
NONH for all modes of transport
WGK Germany 
Flash Point(F) 
Not applicable
Flash Point(C) 
Not applicable


Certificate of Analysis (COA)

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Single- & multi-channel pipettes from BRAND
Protocols & Articles


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