Exercise 3 | Solubility and Precipitation Reactions

The solubility of TlCl (s) in water is 3.3 g.L-1.

Calculate the value of Ksp for TlCl (s).

s (solubility of TlCl (s) in M) = S (solubility in g.L-1) / MTlCl

⇒ s = 1.4 x 10-2 M


Chemical equation:

TlCl (s)  Tl+ (aq) + Cl- (aq)


Pure water: the only source of Tl+ and Cl- is TlCl

From the reaction stoichiometry: [Tl+] = [Cl-]

s = [Tl+] = [Cl-]


Ksp = [Tl+][Cl-]

Ksp = s2

⇒ Ksp = 1.9 x 10-4 2