25508

Potassium sodium tartrate tetrahydrate

puriss., 99.0-101.0% (calc. on H₂O free substance), meets analytical specification of Ph. Eur., BP, USP, FC, E 337

• Synonym(s): L(+)-Tartaric acid potassium Sodium salt, Rochelle salt, Seignette salt
• Linear Formula: KOCOCH(OH)CH(OH)COONa · 4H₂O
• CAS Number: 6381-59-5
• Molecular Weight: 282.22
• Beilstein/REAXYS Number: 6113568
• EC Number: 206-156-8
• MDL number: MFCD00150989
• UNSPSC Code: 12352100
• PubChem Substance ID: 57648125
• NACRES: NA.21

Properties

• grade: puriss.
• Quality Level: 200
• assay: 99.0-101.0% (calc. on H₂O free substance)
• form: solid
• optical activity: [α]20/D +28.0 to +30.0°
• quality: meets analytical specification of Ph. Eur., BP, USP, FC, E 337
• impurities: acidity or alkalinity, in accordance; residual solvent, complies; ≤0.001% heavy metals (as Pb); ≤0.003% total nitrogen (N); ≤0.004% ammonium (NH₄); ≤0.004% free alkali (as NaOH); ≤0.0075% free acid (as C₄H₆O₆); 24-26% water (Karl Fischer)
• loss: 21-26% loss on drying, 150 °C, 3 h
• pH: 6.5-8.5 (20 °C, 1%)
• anion traces: chloride (Cl^-): ≤20 mg/kg; sulfate (SO₄^2-): ≤50 mg/kg
• cation traces: As: ≤1 mg/kg; Ba:, in accordance; Ca: ≤50 mg/kg; Cu: ≤10 mg/kg; Fe: ≤10 mg/kg; Hg: ≤1 mg/kg; Pb: ≤2 mg/kg; Zn: ≤10 mg/kg
• suitability: passes test for appearance of solution
• SMILES string: O.O.O.O.[Na+].[K+].O[C@H]([C@@H](O)C([O-])=O)C([O-])=O
• InChI: 1S/C4H6O6.K.Na.4H2O/c5-1(3(7)8)2(6)4(9)10;;;;;;/h1-2,5-6H,(H,7,8)(H,9,10);;;4*1H2/q;2*+1;;;;/p-2/t1-,2-;;;;;;/m1....../s1
• InChI key: VZOPRCCTKLAGPN-ZFJVMAEJSA-L

Description

General description

Potassium sodium tartrate tetrahydrate (Rochelle salt) exists in the ferroelectric phase in the temperature range of 255 to 297K. In this phase, it crystallizes in the monoclinic system and exhibits space group P2₁. Saturated aqueous solution of potassium sodium tartrate (Rochelle salt) has been used for the preparation of its tetrahydrate crystals.

Potassium sodium tartrate tetrahydrate is a ferroelectric crystal with a high piezoelectric effect and electromechanical coupling coefficient.

Application

Potassium sodium tartrate tetrahydrate has been used in the β-1,3-glucanase activity assay.

Potassium sodium tartrate tetrahydrate may be used as a component to prepare DNS (3,5- dinitrosalicylic acid) reagent and Fehling′s solution B, which are used in the determination of reducing sugar.

Safety Information

• Storage Class: 13 - Non Combustible Solids
• wgk_germany: WGK 1
• ppe: Eyeshields, Gloves, type N95 (US)