If a student makes a solution of sodium sulfide, Na_2S, the sulfide will react w

Question

If a student makes a solution of sodium sulfide, Na_2S, the sulfide will react with the water according to the following equilibrium reaction: S^2+ (aq) + H_2O (1) doubleheadarrow HS^- (aq) + OH^- (aq) K_b. ~~ 10^5 According to our discussion of Le Chatelier's Principle, what disturbances are likely to result in the production of more S^2- in order for the reaction to retain equilibrium? Diluting the solution by addition of water Concentrating the solution by evaporating some of the water (without changing the temperature) Addition of KOH (assuming negligible volume change) Addition of AgNOs to precipitate AgNO_3 (s) (assuming negligible volume change) 3 only 1 and 3 only 2 and 3 only 1 and 4 only 4 only The precipitation of barium sulfate, BaS04, is as follows: Ba^2+ (aq) + SO_4^2- (aq) doubleheadarrow BaSO_4 (s) DeltaH = -26.3 kJ/mol According to our discussion of Le Chatelier's Principle, what disturbances are likely to result in the production of more BaSO_4 (s) in order for the reaction to retain equilibrium? Diluting the solution by addition of water Concentrating the solution by evaporating some of the water (without changing the temperature) Increasing the temperature Decreasing the temperature 4 only 2 and 3 only 2 and 4 only 1 and 4 only 1 and 3 only

Explanation / Answer

Both are based on le chatletliers principle ,

According to which , any change done on the equilibrium will shift the equilibrium in the direction such that the effect of change done is nullified or minimised.

Option 2) On evaportaing water, the concentration will increase and water will decrease so the euqilibrium shifts backwards to increase amount of water .

Option 3) on adding NAOH , The HS- will be consumed as acid base reaction will take place and so the

S-2 increases

Question 21

option 2) oN evaporation the concentration of both ions will increase so, the formation of PPt will start as KIP > KSp so and forms PPT till Kip = Ksp

optuion 4) its a exothermic reaction, if we decrease temperature, it will tend to increase T by release of energy and so shift in forward difrection and so increases BaSO4

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