Potassium hydrogen sulfate
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Potassium hydrogen sulfate, also potassium bisulfate, has formula KHSO4.
KOH + H2SO4 -> KHSO4 + H2O
[edit] PHYSICAL PROPERTIES
Melting point (decomposes): 195-214°C
Density: 2.2 g/cm³
Solubility in water, g/100 ml: 49 (very good)