Question Video: Constructing the Equation for the Solubility Product of a Generic Inorganic Compound | Nagwa Question Video: Constructing the Equation for the Solubility Product of a Generic Inorganic Compound | Nagwa

# Question Video: Constructing the Equation for the Solubility Product of a Generic Inorganic Compound Chemistry • Third Year of Secondary School

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What is the equation for the solubility product of a generic inorganic compound with the formula MA?

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### Video Transcript

What is the equation for the solubility product of a generic inorganic compound with the formula MA?

We often think of substances as being either soluble or insoluble in water. However, even substances that we classify as insoluble may still be soluble in very small amounts. We can express this dissolution using a generic equilibrium reaction. We can write the insoluble solid compound as a reactant using the generic formula MA. The compound will react reversibly in water to produce its constituent ions in solution, in this case the generic ions M+ and A−.

When discussing solubility, we can use a special equilibrium constant called the solubility product, which is abbreviated as 𝐾 sp. The equations for equilibrium constants are generally written as concentrations of the products divided by the concentrations of the reactants. However, when writing the equation for the 𝐾 sp, this reactant is an insoluble solid. The concentration of this solid will not be included in the expression. So, we write the concentrations of the products multiplied by each other.

We write the ions in brackets to represent the measurement of their concentrations. The units for concentration are often moles per liter. The concentrations of the products would also be raised to the power of their stoichiometric coefficients. Since M+ and A− ions are present in a one-to-one stoichiometric ratio in the reaction, it is not necessary to write exponents of one. Therefore, the equation for the solubility product of a generic inorganic compound with the formula MA is 𝐾 sp equals the concentration of M+ times the concentration of A−.

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