Posted by Aaron on Tuesday, March 25, 2014 at 12:37am.
I don't really understand how to do this problem, or where to start exactly. Can someone explain to me where to start and how I can solve the problem in a step by step process?
Thank you in advance!
1. An acetic acid / sodium acetate buffer solution is also 0.020 M AlCl3. The Ksp of aluminum hydroxide is 3 x 10^34.
a) At what minimum pH will Al(OH)3 (s) precipitate form this solution?
b) What ratio of acetate ion to acetic acid concentrations ([C2H3O2^]/[HC2H3O2]) should be maintained to prevent the precipitation of aluminum hydroxide? (Ka acetic acid = 1.7x10^5).

Chemistry  DrBob222, Tuesday, March 25, 2014 at 12:18pm
...........Al(OH)3 ==> Al^3+ + 3OH^
I.........solid.........0.......0
C.........solid.........x.......3x
E.........solid.........x.......3x
Substitute the E line into the Ksp expression for Al(OH)3 and solve for x = (Al^3+). Convert that to OH^, change to H^+ and convert to pH.
Then use the HendersonHasselbalch equation. pH = pKa + log (base)/(acid)
The pH from part 1 goes in for pH here, pKa is that for acetic acid and solve fr (base)/(acid) ratio.
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