Barium sulfate (BaSO4) is insoluble in water because ofwater dipole stamin is too weak come pull away the anions and also cations that theBaSO4 as both Ba 2+ and also SO4 2- ions are big and enlarge cation stabilizes biggeranion strongly results in BaSO4 has higher lattice energy.

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Why is BaSO4 insoluble in water?


For any kind of compounds come be soluble or insoluble in water,lattice enthalpy and hydration enthalpy are two major aspects. First, we have toknow what lattice and hydration enthalpy are,
Lattice Enthalpy (Lattice Energy)

In an easy terms, Lattice enthalpy is the energy required tosplit a compound right into its constituent ions i.e. Anions and cations. In otherwords, that is a cohesive force that needs to bind ion of the compounds one of two people in a gas state or in a solid-state and also these are normally called formationand dissolution lattice power respectively.

Hydration Enthalpy (Hydration Energy)

Hydration enthalpy is simply identified as the lot of energyreleased when one mole the ion combines v a water molecule. In a givenreaction, that has constantly a an unfavorable value together the power is released throughout theprocess i m sorry is also known as an exothermic reaction.


Higher the lattice energy, the molecule will certainly be less soluble orhave much less solubility. And the reverse of it, greater the hydration energy, the moleculewill be much more soluble or have higher solubility.

Now in the situation of BaSO4, it has greater lattice energybecause both Ba 2+ and SO4 2- ion are huge and we know bigger cationsstabilize bigger anions more strongly. Once it is dissolved in water, its hydrationenergy decreases an ext rapidly than lattice energy.

For any type of compound to be soluble in water, its latticeenthalpy have to be lower and also it need to decrease an ext rapidly than hydrationenergy. But this procedure is reversed once BaSO4 is put in water and it isinsoluble.

Note: BaSO4 is not entirely insoluble,it is sparingly dissolve in water, and also itsseparated ions are conveniently saturated v the undissolved precipitatedmolecule. Generally, many of the insoluble compounds room sparingly dissolve asoutermost ions room separated quickly but in an extremely fewer quantities which arenegligible.

How is BaSO4 insoluble in Water?

As pointed out earlier, hydration power when the water the molecule binds through ions are not so much stronger i beg your pardon is able to separatethe ions i.e. Cations and also anions that the BaSO4 molecule, as a result, BaSO4 isinsoluble in water.

We can additionally identify even if it is BaSO4 is dissolve or insolublein water follow to the solubility rules i beg your pardon states many of the sulfatesare dissolve in water with exemption of Ba 2+, Ca 2+, Pb 2+, Ag 2+, and also Sr 2+.

Moreover, both solubility and solubility assets of BaSO4are 0.0002448 g/100 mL (20°C) and 1.0842×10-10 (25°C) which are extremelylower values when compared with dissolve compounds favor NaCl or HCl.

BaSO4 soluble or insoluble (Determining factors)

For any compound come be dissolve or insoluble in water, over there are numerous factors that influenced the solubility that the compounds. Here are several of the significant determining factors which room responsible for the solubility of BaSO4:
Solubility and Solubility Product

Higher the solubility and solubility product the themolecule, much more soluble in water. But BaSO4 has an extremely lower solubility (0.0002448g/100 mL) and also solubility product (1.0842×10-10) which provides it insoluble inwater.

Solubility Principle

According to the solubility rule “like disappear like”which means similar type of solute is soluble in similar kind solvent i.e.polar molecules room most frequently soluble in polar solvents and also nonpolar space solublein nonpolar solvents.


Temperature has a very big role in the solubility the thecompounds. When the temperature the the equipment increases, solubility alsoincreases and vice-versa. At room temperature BaSO4 is almost insoluble however whentemperature increases, the ions begin separating more, and much more andsolubility increases.

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pH value

pH has reciprocal relation with the sparingly soluble basesor straightforward salts solubility i.e. Once pH increases, solubility decreases and whilepH decreases, solubility increases.