Aluminum hydroxide is amphoteric with precipitation and complexation been contro

Question

Aluminum hydroxide is amphoteric with precipitation and complexation been controlled by the following equilibrium processes: Al^3+ (aq) + 3OH^- (aq) doubleheadarrow Al(OH)_3(s) Al(OH)_3(s) + OH^- (aq) doubleheadarrow [Al(OH)_4]^- (aq) If acid is added drop-wise to a solution of the aluminum complex which of the following will occur a. A precipitate will form, disappear and then reform b. A precipitate will form and then disappear c. A gas will be evolved d. A precipitate will form and remain e. No precipitate will form

Explanation / Answer

For the complex, we need to analyse the SECOND equilibrium

if we add acid slowly, OH- ions dissapear

this makes a shift toward Al(OH)3s vs. OH-

Until Qcomplex vs Q(Al(OH)3) have a difference

then, there will be reaction

There will be a precipitate formation, Al(OH)3s due to the shif tof the FIRST equilbirium

Then it will dissapear, since all OH- reacts and Al+3 must be formed

choose

B=

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