Cream of Tartar, chemically known as Potassium Tartrate (CAS 921-53-9), is a compound whose versatile functionality is deeply rooted in its distinct chemical properties. Derived from tartaric acid, this white, crystalline powder serves critical roles across various industries, from enhancing the texture of baked goods to stabilizing pharmaceutical formulations and facilitating industrial processes. For chemists, formulators, and procurement specialists, a thorough understanding of its chemical behavior is key to leveraging its full potential. If you are looking to buy high-quality Potassium Tartrate, understanding its chemistry is your first step.

Molecular Structure and Acidity

Potassium Tartrate is the potassium acid salt of tartaric acid. Its molecular formula is KC4H5O6, with a molecular weight of approximately 188.18 g/mol. The compound is characterized by its slightly acidic nature when dissolved in water, typically exhibiting a pH around 3.5. This acidity is a direct result of the bitartrate anion, which retains a proton from the original tartaric acid. This inherent acidity is central to many of its functional applications.

Key Chemical Reactions and Functions:

  • Acid-Base Reactions (Leavening): In baking, Potassium Tartrate reacts with alkaline substances like sodium bicarbonate (baking soda) in the presence of moisture. This acid-base reaction generates carbon dioxide gas, which expands when heated, causing doughs and batters to rise. This makes it a vital ingredient for manufacturers of baking powders and mixes.
  • Protein Stabilization (Foaming): In applications like meringues and whipped cream, Potassium Tartrate's acidity helps to denature proteins in egg whites or dairy. It lowers the pH, promoting the formation of stable protein networks that entrap air, thereby creating a more stable and voluminous foam. This property is invaluable for recipes requiring structural integrity.
  • Solubility and Crystallization: Potassium Tartrate has limited solubility in cool water but increases significantly with temperature. This property is exploited in winemaking for cold stabilization, where cooling the wine causes potassium tartrate to precipitate out, preventing later crystallization in the bottle.
  • Chelation and Buffering: Its chemical structure allows it to chelate metal ions and act as a buffer, contributing to its use in cleaning agents and maintaining stable pH levels in various formulations.

Sourcing High-Purity Potassium Tartrate

For researchers and manufacturers, sourcing Potassium Tartrate with consistent chemical purity is essential for predictable performance. NINGBO INNO PHARMCHEM CO.,LTD. specializes in providing high-purity Potassium Tartrate, ideal for demanding applications. Whether you need it for precise chemical reactions, food formulations, or pharmaceutical preparations, understanding the chemistry behind this compound ensures you can effectively specify and utilize it. As a leading supplier, we are dedicated to meeting the chemical needs of diverse industries, ensuring quality and reliability for all your Potassium Tartrate requirements.