Question

MULTIPLE CHOICE. Choose the one alternative that best completes the oose the one alternati 48) 45) Which is more soluble in an acidic solution than in pure water? A) Cul B) PbCl2 C) NaBr D) NaNO3 E) Ca3(PO4)2 49) 49) For the endothermic reaction A2(8)2A(g), a snapshot of an equilibrium mixture of A(g) and A2(8) may look as follows. (Each circle represents 1.0 mol of A atoms, and the volume of the box is 1.0 L.) o-o What is the equilibrium constant Kp for this reaction at 298 K? (R = 0.08206 L-atm/K·mol) A) 0.22 B) 65 C) 1.3 x 102 D) 5.33 E) 16 SHORT ANSWER. Write the word or phrase that best completes each statement or answers the question. 50) 50) Suppose 4.2 mol of oxygen and 4.0 mol of NO are introduced to an evacuated 0.50-L reaction vessel. At a specific temperature, the equilibrium 2NO(g) + 02(g)2NO2(g) is reached when [NO] 1.6 M. Calculate Kc for the reaction at this temperature.

Answer 1

49. answer is ( E) Ca3(PO4)2. as it dissociate to give 3Ca2+ and 2 PO4 3- ions.

In acid medium H+ will get combine with PO4 3- to form weakly dissociative H3PO4 ( relatively) . Thus we have less PO4 3- ions . hence in accordance with Lechatliers pricniple now equilibrium shifts such that more Ca2+ is produced . Hence solubility increases.

Note : In general, if the anion of a salt is the conjugate base of a weak acid, then it is more soluble in acidic solvent

Ca3(PO4)2: PO4^-2 is an anion of weak acid hence it is more soluble in acidic solvent

correct option is (E)

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