If the concentration of OHions in the reaction Fe OH s Fe aq 3OH aq is decreased by 4 times, the equilibrium concentration of Fe will increase by (CBSE AIPMT 2008)

+3 3 Fe(OH) (s) Fe (aq) 3OH (aq) -> So, the equilibrium constant, 3 3 K [Fe ][OH ] Now, if the concentration of the hydroxide ion is reduced by 4 times, then, Let 1 3 Fe be new conc. 3 1 3 OH K Fe 4 x 3 1 3 OH K Fe 64 Hence, the equilibrium concentration is increased by 64 times.