Potassium sulfate (K2SO4) is a salt of sulfate and potassium ions, usually colorless or white crystals, particles or powders. No smell, bitter taste. It is hard and hard. The chemical properties are not active. Stable in air. Density 2660kg/m3. The melting point is 1069 degrees. The aqueous solution is neutral and pH is about 7 at room temperature. 1g dissolved in 8.3ml water, 4ml boiling water, 75ml glycerol, insoluble in ethanol.
Appearance and character: colorless or white six square or trapezoid crystal or granular powder.
Taste: bitter and salty.
Density: 2660 kg / cubic meter.
Solubility: 110 g/L (20 C), soluble in water, insoluble in ethanol, acetone and carbon disulfide. Potassium chloride and ammonium sulfate can increase their solubility in water, but they are almost insoluble in the saturated solution of ammonium sulfate.
Flame reaction: Purple (through blue cobalt glass)
Metathesis reaction: it can react with soluble barium salt solution to form barium sulfate precipitate.
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