25. Check the alternative that is NOT correct about solubility equilibrium. (Jus

Question

25. Check the alternative that is NOT correct about solubility equilibrium. (Justify the correct and wrong answers).

A) The pressure on the solubility equilibrium does not have a significant and practical effect, because the liquids suffer less the effect of the pressure than gases under atmospheric pressure.
B) In general, the degree of dissociation of a soluble salt will increase with increasing temperature.Therefore, the molar solubility will increase.

C) Precipitates containing anions of the conjugate base type of a weak acid are more
Soluble at lower pH.
The concentration of the sulfate ion required to initiate the precipitation of CaSO4 in a 1x10-4 molL-1 Ca2 + (Kps = 2.4x10-5) solution is 5.4x10-5 mol.L-1
.
E) The effect of the common ion is responsible for the decrease of the solubility of an ionic precipitate.

Explanation / Answer

Answer:-

(D).The concentration of the sulfate ion required to initiate the precipitation of CaSO4 in a 1x10-4 molL-1 Ca2 + (Kps = 2.4x10-5) solution is 5.4x10-5 mol.L-1

This is not correct.

because the concentration of the sulphate will be 1.54 x 10-2 mol.L-1

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