Barium sulfate (BaSO4) is insoluble in water because ofwater dipole stamin is as well weak to pull away the anions and cations that theBaSO4 together both Ba 2+ and also SO4 2- ions are huge and larger cation stabilizes biggeranion strongly outcomes in BaSO4 has higher lattice energy.

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Why is BaSO4 insoluble in water?


For any compounds to be dissolve or insoluble in water,lattice enthalpy and also hydration enthalpy room two significant aspects. First, we have actually toknow what lattice and also 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 also cations. In otherwords, that is a cohesive pressure that demands to bind ions of the compounds one of two people in a gas state or in a solid-state and these room normally called formationand resolution lattice power respectively.

Hydration Enthalpy (Hydration Energy)

Hydration enthalpy is simply defined as the quantity of energyreleased as soon as one mole that ion combines v a water molecule. In a givenreaction, it has always a an adverse value together the power is released during theprocess i beg your pardon is likewise known as an exothermic reaction.


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

Now in the instance of BaSO4, it has greater lattice energybecause both Ba 2+ and SO4 2- ions are huge and we know bigger cationsstabilize bigger anions much more strongly. As soon as it is liquified in water, the hydrationenergy decreases an ext rapidly than lattice energy.

For any kind of compound to be soluble in water, that is latticeenthalpy should be lower and it should decrease much more rapidly 보다 hydrationenergy. Yet this process is reversed when BaSO4 is put in water and also it isinsoluble.

Note: BaSO4 is not totally insoluble,it is sparingly dissolve in water, and also itsseparated ion are easily saturated v the undissolved precipitatedmolecule. Generally, many of the insoluble compounds are sparingly soluble asoutermost ions space separated quickly but in really fewer amounts which arenegligible.

How is BaSO4 insoluble in Water?

As discussed earlier, hydration energy when the water the molecule binds through ions room not so much stronger i beg your pardon is able come separatethe ions i.e. Cations and anions the the BaSO4 molecule, as a result, BaSO4 isinsoluble in water.

We can additionally identify whether BaSO4 is dissolve or insolublein water according to the solubility rules i m sorry states most of the sulfatesare dissolve in water with exception of Ba 2+, Ca 2+, Pb 2+, Ag 2+, and Sr 2+.

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

BaSO4 dissolve or insoluble (Determining factors)

For any type of compound come be dissolve or insoluble in water, there are countless factors that impacted the solubility of the compounds. Here are few of the major determining factors which space responsible because that the solubility of BaSO4:
Solubility and Solubility Product

Higher the solubility and solubility product the themolecule, an ext soluble in water. However BaSO4 has really lower solubility (0.0002448g/100 mL) and solubility product (1.0842×10-10) which renders it insoluble inwater.

Solubility Principle

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


Temperature has a very huge role in the solubility the thecompounds. As soon as the temperature that the solution increases, solubility alsoincreases and also vice-versa. At room temperature BaSO4 is nearly insoluble but whentemperature increases, that is ions start separating more, and an ext andsolubility increases.

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pH value

pH has reciprocal relation with the sparingly dissolve basesor an easy salts solubility i.e. When pH increases, solubility decreases and also whilepH decreases, solubility increases.