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Question

If the concentration of OH ions in the reaction Fe(OH)3(s)Fe3+(aq)+3OH(aq) is decreased by 1/4 times, then equilibrium concentration of Fe3+ will increased by:

A
64 times
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B
4 times
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C
8 times
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D
16 times
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Solution

The correct option is A 64 times
Fe(OH)3(s)Fe3+(aq)+3OH(aq)
K=[Fe3+][OH]3[Fe(OH)3]
K=[Fe3+][OH]3 ( activity of solid is taken unity)
Concentration of OH ion in the reaction is decreased by 1/4 times, then equilibrium concentration of Fe3+ will increased by 64 times in order to keep the value of K constant.

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