ANTIMONY POTASSIUM TARTRATE (trihydrate) is a fine chemical product from the brand RESEARCH-LAB FINE CHEM INDUSTRIES. It is also known as Tartar emetic.Molecular Formula: C8H4K2O12Sb2 3H2O CAS Number: 28300-74-5 Molecular Weight: 667.87Quantity: 500 gm/BottleMelting point: 300 C(lit.) Purity: 99%The product is used to prepare antimony (Sb(III)) stock solution in deionized water (100mg/L). It is also used in the spectrophotometric determination of total phosphorus in dry sediments.