7. Consider the equilibrium in a saturated solution of barium fluoride. BaF2 (s)

Question

7. Consider the equilibrium in a saturated solution of barium fluoride. BaF2 (s) Ba2 (aq) 2 F (aq) Kp= 1.7×10-6 at 25°C a) Is BaF2 an acidic or basic salt? b) When H" is added, it reacts with F. So as more H' is added, concentration of F decreases over time. According to LeChatelier's Principle, due to this, the equilibrium must shift towards reactants / products c) This shift causes the solubility of BaF2 to increase / decrease 8. In general, adding an acid, or adding H' to a solution of insoluble salt will increase solubility / decrease its

Explanation / Answer

1a)BaF2 is a basic salt as it is a salt of strong base Ba(OH)2 and weak acid HF.

1b)when H+ is added

H+ + F- ------------> HF

HF is a weak acid , so dissociates poor , thus decreases the concentration of F- ions.

This change causes decrease in [F-] which is a product of soluility equilibrium.

Hence according to Le -Chatlier principle, as product concentration decreases, the equilibrium shifts to right side (product side0.

1c) The shift causes the solubility of BaF2 to increase .

2) In general the basic salts solubility increases with addition of H+ ions/acid.

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