Question

The concentration of a saturated solution of an ionic compound at 25 oC is 7.00E-4. The formula for this compound is XQ3. What is the concentration of Q at equilibrium? Answer Submitted: Your final submission will be graded when the time limit is reached. Tries 1/98 Previous Tries What is the Ksp value for XQ3?

Answer 1

Conc of Q at Equilibrium 2.1 × 10⁻³ mol/dm³

Ksp = 1.57 × 10⁻¹² mol/dm³

Step-by-step explanation:

The Solubility of the Ionic compound is given by s

where s = 7 × 10⁻⁴ mol/dm³

solubility equation is given as follows

XQ₃(s) ⇄ X³⁺(aq) + 3Q⁻(aq)

s s 3s

let the concentration of each be s

The concentration of Q = 3s

⇒ [Q] = 3 × 7 × 10⁻⁴ mol/dm³

⇒ [Q] = 2.1 × 10⁻³ mol/dm³

hence,

Ksp = [X³⁺][Q⁻]³

Ksp = [s][3s]³

Ksp = [7 × 10⁻⁴ ][2.1 × 10⁻³]³

Ksp = 1.57 × 10⁻¹² mol/dm³