Question

Lead antimonite, Pb₃(SbO₄)₂, is used as an orange pigment in oil-based paints and in glazes. Write a balanced chemical equation and a solubility product expression for its dissolution in water.

Short answer

Pigment and solubility product

A pigment is a chemical material that is nearly insoluble in water. Pigment are generally inorganic compounds.

$$\begin{gathered} AB\leftrightarrows A^{+}+B^{-} \\ {K}_{SP}={\left[A^{+}\right]}^{\text{'}}X{\left[B^{-}\right]}^{\text{'}} \end{gathered}$$

Step-by-step solution

Step-1:- Answer of the above question

The name of the compound is lead antimonite, Pb₃(SbO₄)₂. The balanced chemical equation is

$K_{SP}P{b}_3{\left(Sb{O}_4\right)}_2\left(s\right)\leftrightarrows 3P{b}^{2+}\left(aq\right)+2Sb{O}_4^{3-}\left(aq\right)$

The solubility product of the above balanced chemical reaction is-

$K_{SP}={\left[P{b}^{2+}\right]}^{3}x{\left[Sb{O}_4^{3-}\right]}^2$

Step-2:- Dissociation reaction and solubility product

The dissociation reaction of Pb₃(SbO₄)₂ is-

$$\begin{gathered} P{b}_3{\left(Sb{O}_4\right)}_2\to P{b}^{2+}+Sb{O}_4^{3-} \\ P{b}_3{\left(Sb{O}_4\right)}_2\to 3P{b}^{2+}+2Sb{O}_4^{3-} \end{gathered}$$

The solubility product of the above equation is-

$K_{SP}={\left[P{b}^{2+}\right]}^{3}X{\left[Sb{O}_4^{3-}\right]}^2$

Step-3:  Conclusion

Where, K_SP represents the solubility product of any reversible reaction.