Potassium sodium tartrate solution , 1.5MinH2O , 304-59-6

Synonym(s):
L-(+)-Tartaric acid potassium Sodium salt solution

CAS NO.：304-59-6

Empirical Formula: C4H4KNaO6

Molecular Weight: 210.16

MDL number: MFCD00065391

EINECS: 206-156-8

PRODUCT Properties

• Melting point: 70~80℃
• Boiling point: 100 °C
• Density: 1.24
• vapor pressure: 0Pa at 25℃
• storage temp.: Room Temperature
• solubility: Methanol, Water
• form: Liquid
• color: Clear Colorless
• PH: 7.0-8.5 (25℃, 1.5M in H2O)
• optical activity: [α]20/D +22±1°, c = 1% in H2O
• Water Solubility: g anhydrous/100 g H2O: 31.9 (0°C), 67.8 (20°C), 102 (30°C) [LAN05]; slightly soluble alcohol [MER06]
• λmax: λ: 260 nm Amax: 0.03; λ: 280 nm Amax: 0.025
• LogP: -1.080 (est)

Description and Uses

Potassium sodium tartrate is a double salt first prepared (in about 1675) by an apothecary, Pierre Seignette, of La Rochelle, France. As a result the salt was known as Seignette's salt or Rochelle salt. Rochelle salt is not to be confused with rock salt, which is simply the mineral form of sodium chloride. Potassium sodium tartrate and mono potassium phosphate were the first materials discovered to exhibit piezo electricity.
It is a colorless to blue - white salt crystallizing in the orthorhombic system. Its molecular formula is KNaC₄H₄O₆·4H₂O. It is slightly soluble in alcohol but more completely soluble in water. It has a specific gravity of about 1.79, a melting point of approximately 75°C, and has a saline, cooling taste. As a food additive, its E number is E337.
It has been used medicinally as a laxative. It has also been used in the process of silvering mirrors. It is an ingredient of Fehling's solution, formerly used in the determination of reducing sugars in solutions.

Sodium Potassium Tartrate is a buffer and sequestrant that is the salt of i, (+)–tartaric acid. It has a solubility in water of 1 g in 1 ml. It is also termed rochelle salt and potassium sodium tartrate.

Safety

• WGK Germany: WGK 3