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Potassium sulfide is an ionic compound that is moderately water soluble. Its melting point is 840 deg C. In aqueous solutions, it forms an orange-red crystalline powder. However, it has a bitter taste and can be an irritant.
This solid is commonly found in photographic toners. It is also used as a colorant in metals, such as bronze. It reacts with sulfuric acid to form potassium bisulfate.
Potassium sulfide is a highly flammable and explosive solid. It is also poisonous. When it is released, it produces hydrogen sulfide. Some of the chemicals that contain this compound can be toxic to humans and animals. The toxic fumes are harmful to inhale. If potassium sulfide gets in the intestines, it can create copper.
Solubility of a substance depends on a variety of factors, including pH, temperature, pressure, and so on. Typically, the concentration of a solution is measured in grams of solute per liter of water. Another way of measuring solubility is saturation concentration. Generally, the saturation concentration of a substance is less than 0.1 g per 100 mL of a solvent.
Solubility is also determined by the chemical properties of the solute and the solvent. Most sulfate compounds are readily soluble in water. Iron sulfate, barium sulfate, magnesium sulfate, and calcium sulfate are all water soluble.
The best method to separate reaction products is through filtration. For example, when a potassium sulfide and ammonium acetate aqueous solution are exposed to air, the sulfate forms an orange crystal. Once the crystal has settled, the residue is dissolved.
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