Potassium Sodium Tartrate Tetrahydrate, Certified AR for Analysis, Fisher Chemical, Quantity: 500g, CAS: 6381-59-5, White, Melting Point: 70 deg.C, Molecular Formula: C4H12KNaO10, Molecular Weight: 282.218, Packaging: Plastic powder jar, pH: 5.5 to 8.5