Synonym(s): Potassium hydrogen sulfate Empirical Formula: HKO₄S Linear Formula: KHSO₄ Formula Weight: 136.17 MDL Number: MFCD00011404 Purity: ≥99.99% trace metals basis Melting Point: 214 °C(lit.) Density: 2.32 g/mL at 25 °C(lit.)