Question

Calculate the solubility of co(oh)3 in a saturated solution of co(oh)3

Answer 1

Co(OH)₃(s) ⇄ Co³⁺(aq) + 3OH⁻(aq)

Ksp=1.6×10⁻⁴⁴ (reference data)

Ksp=[Co³⁺][OH⁻]³

c=[Co³⁺]=[OH⁻]/3

Ksp=c×(3c)³=27c⁴

c=⁴√(Ksp/27)

c=⁴√(1.6×10⁻⁴⁴/27)=4.93×10⁻¹² mol/L