KSP Chemistry: Full Explanation Of The Soluble Product Constant

KSP Chemistry Full Guide With Definition, Expression, And FAQS

Hi everyone, this article is about KSP Chemistry. In this article, you will learn about KSP Chemistry its importance, and its expressions. To understand KSP Chemistry please read this article completely. If you do not understand anything about KSP Chemistry then leave your valuable comment in the comment section box. So, let’s start to read this article…

Solubility Product Constant (KSP)


The Concept of Solubility Product Constant (KSP) is used for sparingly soluble salts. It Means the salts which dissolve in very low amount. Their solubility must be less than 0.01M.


The product of equilibrium concentrations of both positive and negative ions in a saturated solution of a dissolved solute (salt) is called a solubility product constant.


To understand solubility product constant more accurately we use water as a solvent in a beaker and add silver chloride as an insoluble solute. As we know silver chloride is an insoluble salt and cannot dissociate completely in ions. That’s why there will be some ions of silver and chloride ions in a beaker and a large amount of silver chloride will remain in a solid form.

As we know that in a saturated solution the maximum amount of solute will be dissolved and if we add more solute then it will not dissolve any more. Hence the silver chloride solution is a saturated solution. KSP Chemistry

Now a dynamic equilibrium is established between the un-dissolved salt and its dissociate positive and negative ions in the solution.

Ag Cl (s) ⇋ Ag+(aq) + Cl (aq)

Expression OF KSP

Here we have silver chloride as a reactant which is present in the form of a solid and the product are silver ions and chloride ions. From the Law of the mass of action, we have…..

Kc= [Ag+] [Cl]

As we know according to the Law of mass action equilibrium concentration Kc is equal to the equilibrium concentration of product over the equilibrium concentration of the reactant. The square brackets represent the equilibrium concentration.

Kc [ Ag Cl ] = [ Ag+] [ Cl]

Here silver chloride is present in solid form. As we know that when we have sodium chloride or any other solution in solid form than we consider it a constant because it is insoluble salt and it dissociates in a very low amount. As Ag Cl is solid and its concentration remains constant due to very light dissociation. So, we can write as

Kc X K = [ Ag+] [ Cl]


KSP does not have any unit due to the molar concentrations. Their molar concentrations are different for each equation of product and reactants. The activity of a substance is a measure of the degree of presence of a chemical compound, respective to a reference state.

They eliminate the units of all the quantities in the equilibrium constant expression because activities are unitless, so making the constant itself unitless all the time.

Why is KSP important?

The solubility product constant (Ksp), is an important part of chemistry, particularly when you are analyzing the solubility of different solutes or working with solubility equations. To describe the equilibrium between a solid and its constituent ions in a solution we use the solubility product constant (Ksp). The degree to which the compound can dissociate in water the value of the constant identifies it. The more soluble the compound is the higher the Ksp.

How does KSP affect precipitation

If an ionic product is less than the Solubility product then no precipitate will form on adding more solute because an unsaturated solution is formed. If an ionic product is larger than the Solubility product then excess solute will precipitate out because of the formation of a supersaturated solution.

What is KSP used for?

Ksp is used for sparingly soluble salts. It means the salts which dissolve in a very low amount. Their solubility must be less than 0.01M.

What units are KSP in?

No, KSP has no units.

What is KSP in Chemistry?

The solubility product constant (Ksp), is an important part of chemistry particularly when you are analyzing the solubility of different solutes or working with the solubility equation

Why Does KSP Increase With Temperature?

The solubility increases with temperature For many solids dissolved in liquid water. It increases the kinetic energy of the molecules that comes with the higher temperatures. The higher temperature allows the molecules of the solvents to break apart the molecules of solute more effectively that are held together by intermolecular attractions.
The only temperature can change the Ka, Kb, Keq, and Ksp.

What is the KSP of PBCL2?

The bromides, iodides, and chlorides of all metals except silver, lead and mercury(I) are soluble in water. Mercury diiodide (HgI2) is insoluble in water. Lead(II) chloride (PbCl2), Lead(II) bromide (PbBr2), and Lead(II) iodide (PbI2) are soluble in hot water.

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