Calcium sulfate is soluble in water in percentages ranging from 0.2 to 0.88 grams per 100 milliliters of water, depending on the anhydrous or hydrated form of the substance. For example, insoluble anhydrite, a dehydrated form of calcium sulfate, dissolves slowly in water and does not absorb moisture from air.
In contrast, soluble anhydrite, a compound obtained by heating calcium sulfate dihydrate, has a high affinity for water and quickly absorbs it. The hydrated form, which is called calcium sulfate dihydrate, dissolves in water at a ratio of 0.21 grams per 100 milliliters of water. Other hydrated forms, such as the calcium sulfate hemihydrate alpha and beta forms, have solubilities of 0.67 and 0.88 grams per 100 milliliters of water.Learn More
Solubility of a solute can be determined by comparing the polarities of the solute and the solvent molecules. Polar solvents will dissolve polar solutes and nonpolar solvents will dissolve non-polar solutes due to the presence of similar intermolecular forces.Full Answer >
To separate sand and salt, dissolve the salt in water, decant the liquid and evaporate the water to leave salt crystals. Salt and sand is a heterogeneous mixture that can be separated by physical means.Full Answer >
Sublimed sulfur is sulfur that has been purified through sublimation. Sublimation is the phase change of a substance from solid to gas without transitioning through a liquid state.Full Answer >
Factors that may affect the dissolving process include stirring the solution, increasing the temperature, increasing the pressure and having a smaller crystal size. These factors may have an effect on both the solubility of a solid and the rate of dissolution.Full Answer >