Overview
Rochelle Salt, chemically known as potassium sodium tartrate, is a double salt first prepared by Pierre Seignette in the 17th century. It is widely recognized for its piezoelectric properties, making it valuable in scientific and industrial applications. The compound is also used as a food additive due to its emulsifying and stabilizing properties. In its natural form, Rochelle Salt appears as colorless or white crystals. It is non-toxic and water-soluble, which contributes to its versatility in various industries. Its historical significance and modern applications make it a notable chemical in both academic and commercial settings.
Physical and Chemical Properties
Rochelle Salt has a molecular weight of 282.22 g/mol and a density of 1.79 g/cm³. It decomposes at temperatures between 70-80°C, releasing water molecules and forming anhydrous potassium sodium tartrate. The compound is highly soluble in water but insoluble in alcohol, which makes it suitable for aqueous solutions. One of its most notable properties is its piezoelectric effect, which allows it to generate an electric charge under mechanical stress. This property has been exploited in early radio transducers and microphones. Additionally, its non-toxic nature and stability under normal conditions make it a safe choice for food and pharmaceutical applications.
Main Applications
Rochelle Salt is primarily used in the food industry as an emulsifier and stabilizer, particularly in baking powders and processed foods. Its ability to maintain consistency and prevent separation makes it a valuable additive. In the electronics industry, its piezoelectric properties are utilized in devices such as microphones, phonograph pickups, and pressure sensors. The compound is also employed in electroplating solutions to improve the quality of metal coatings. Its versatility extends to laboratory settings, where it serves as a buffer and reagent in various chemical processes.
Safety and Storage
While Rochelle Salt is generally considered safe, proper handling is essential to avoid potential health risks. Prolonged exposure to dust or solutions may cause mild irritation to the skin, eyes, or respiratory tract. Personal protective equipment, such as gloves and goggles, is recommended during handling. Storage conditions should prioritize a cool, dry environment to prevent moisture absorption and clumping. The compound should be kept in airtight containers to maintain its stability and shelf life. Disposal should follow local regulations to minimize environmental impact.
B2B Procurement Guide
When purchasing Rochelle Salt, buyers should verify the CAS number (6381-59-5) to ensure product authenticity. Purity requirements vary by application, so specifications should be clearly communicated to suppliers. Food-grade and industrial-grade variants are available, each with distinct quality standards. Price ranges typically fall between $5-$15 per kg, depending on quantity and purity. Bulk purchases may offer cost savings, but buyers should assess supplier reliability and compliance with industry regulations. Sampling and third-party testing are advisable for large-scale procurement to guarantee quality and consistency.
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