March 28, 2024, 12:53:01 PM
Forum Rules: Read This Before Posting


Topic: Reaction question  (Read 2021 times)

0 Members and 1 Guest are viewing this topic.

Offline sn1sn2e1e2

  • Regular Member
  • ***
  • Posts: 31
  • Mole Snacks: +0/-0
Reaction question
« on: March 20, 2014, 10:44:31 AM »
Quick question:
Which 2.00 M solution can be used to separate Al3+ from Fe3+ in an aqueous solution?

(A) HCl
(B) H2SO4
(C)NaCl
(D)NaOH

If you choose D, you are right, but I thought OH- ions always forms solids with Al3+ and Fe3+. If you add in OH ions, wouldn't both precipitate? Or do you need to precipitate both to "separate" them?

Offline Hunter2

  • Sr. Member
  • *****
  • Posts: 2153
  • Mole Snacks: +162/-47
  • Gender: Male
  • Vena Lausa moris pax drux bis totis
Re: Reaction question
« Reply #1 on: March 20, 2014, 11:51:10 AM »
Aluminium creates first precipitate as you described, but in excess of OH- you will get complex like [Al(OH)4]-. Iron stands with its hydroxide.

Sponsored Links