ТАРТРАТ КАЛИЯ

Substance identification

Potassium tartrate (dipotassium tartaric acid salt, English name Potassium tartrate) - potassium tartaric acid salt, CAS 304655-91-2, formula C4H4K2O6. Synonyms: L-(+)-dicotassium salt of tartaric acid, L(+)-dicassium salt of tartaric acid, food additive E336 (as part of a mixture of potassium salts of tartaric acid).

Basic Attributes

• Molecular weight: 226.27
• Exact weight: 225.928
• EU number: 205-697-7
• PSA Specifications: 121

Physico-chemical characteristics

• Density: 1.984 at 18 °C
• Boiling point: 399.3 °C at 760 mm Hg. Art.
• Flash point: 209.4 °C
• Solubility in water: 1 g dissolves in 162 ml of water, 16 ml of boiling water, 8820 ml of alcohol; easily dissolves in dilute mineral acids; dissolves in alkali or borax solutions; solubility in water - from 0.4% at 10 °C to 6% at 100 °C

Scope of application

Dipotassium tartaric acid belongs to the food additives of the group of acidity regulators and emulsifiers (E336 as part of a mixture of potassium tartrates). It is used in the baking industry as a component of dough leavening agents - it reacts with sodium bicarbonate to release carbon dioxide, ensuring the rise of baked goods; together with acid phosphates, it is included in the recipes of quick leavening agents for confectionery products. In the food industry it acts as a buffering agent and sequestrant, binding calcium and iron ions and stabilizing the color and taste of products, slowing down oxidative spoilage. In winemaking, tartaric acid salt is used to stabilize wine and correct the acidity of the must, and also as a source of potassium ions when fine-tuning the mineral composition. In laboratory and analytical practice, potassium tartrate is used as a reagent for the preparation of buffer solutions, as a complexing agent for transition metal ions, and as a component of compositions for silvering mirrors and galvanic baths, where the tartrate ion holds the metal in solution in the form of a soluble complex.

Chemical nature

The underlying tartaric acid is a dibasic hydroxy acid with two chiral centers; The natural L-(+)-isomer is obtained from winemaking waste (tartar). Dipotassium salt is formed by complete neutralization of both carboxyl groups with potassium hydroxide or carbonate and, unlike potassium acid tartrate (tartar), is highly soluble in water without the formation of a precipitate. The tartrate anion is capable of forming chelate complexes with metal ions due to carboxyl and hydroxyl groups, which determines its use as a complexing agent.

Safety Information

• WGK Germany: 3

Storage and transportation conditions

Store in a dry, well-ventilated area in a tightly closed container, away from sources of moisture, since the salt is hygroscopic and easily dissolves in water - upon contact with moist air, the crystals cake and lose their flowability. The dump does not indicate any special transport restrictions by hazard class; When transporting, comply with the general requirements for bulk chemical products, protect containers from wetness and mechanical damage, and do not allow joint storage with strong acids and oxidizing agents.