Equilibrium test question

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Dhamnekar Winod
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Equilibrium test question

Post by Dhamnekar Winod »

\(Br_2(l) + H_2O (l) \rightleftharpoons Br^-(aq)+ BrO^- (aq) + 2H^+\)
If sodium hydroxide is added to the mixture, what will happen to the position of equilibrium?

1)The equilibrium shifts to the right.
2)The position of the equilibrium remains unchanged.
3)The equilibrium shifts to the left.

Answer provided is 3).
Let us see this reaction experimentally.
\(Br_2(l) + H_2O(l) + 2NaOH \rightleftharpoons Br^-(aq) + BrO^-(aq) + 2H_2O +2Na^+\)

Now, I don't understand how does this reaction shift to the left?

Would any member of this chemistry forum explain?
Any science consists of the following process. 1) See 2)Hear 3)Smell,if needed 4)Taste, if needed 5)Think 6)Understand 7)Inference 8)Take decision [Believe or disbelieve, useful or useless, true or false, cause or effect, any other criteria]
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ChenBeier
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Re: Equilibrium test question

Post by ChenBeier »

3 is wrong, the equilibrium will be unchanged. No 1 is right. The NaOH neutralise only the H+. So to getnew H+ the equilibrium has to shift to right.
Additionally you can skip 1 H2O in the equation.
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