What Is the Molar Solubility Equation?


Quick Answer

The molar solubility equation is the symbolic representation of the maximum number of moles of a substance able to dissolve in one liter of solvent. Molar solubility is described as the number of moles of a substance that can be dissolved per liter of solution before the solution becomes saturated.

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Full Answer

The mole is the unit of measurement for the amount of substance. The units of measure of molar solubility are mol/L, sometimes written as M.

Molar solubility can be calculated from a substance’s solubility product constant, expressed as Ksp and stoichiometry. The Ksp value is constant for each substance that depicts how easily a substance dissolves. The stoichiometry of the reaction, in this case, is the calculation of the quantities of the products and reactants in a chemical reaction required to calculate the value of M.

When calculating molar solubility, the chemical equation should be balanced. In other words, there should be equal numbers of each atom on both the product and reactant side of the chemical reaction. To find the value of M, the Ksp value of the solute should be known.

Certain factors influence molar solubility such as temperature. When the solvent is heated; the compound dissociates a lot more. Therefore, molar solubility increases with temperature. If the temperature of the saturated solution is decreased, the value of M decreases.

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