April 24, 2024, 02:33:31 AM
Forum Rules: Read This Before Posting


« previous next »
Pages: [1]   Go Down

Topic: What is the equilibrium when HCl is added to an aq solution of cobalt chloride?  (Read 3484 times)

0 Members and 1 Guest are viewing this topic.

Offline Bob Sacamano

  • Regular Member
  • ***
  • Posts: 63
  • Mole Snacks: +1/-3
What is the equilibrium when HCl is added to an aq solution of cobalt chloride?
« on: September 17, 2010, 01:37:24 PM »
A pink to blue color change is observed when HCl is added to an aq solution of cobalt chloride. A shift back to pink is observed when the solution is diluted.

What is the equilibrium equation?
Logged

Offline Borek

  • Mr. pH
  • Administrator
  • Deity Member
  • *
  • Posts: 27655
  • Mole Snacks: +1801/-410
  • Gender: Male
  • I am known to be occasionally wrong.
    • Chembuddy
Re: What is the equilibrium when HCl is added to an aq solution of cobalt chloride?
« Reply #1 on: September 18, 2010, 03:23:35 AM »
You have to try by yourself first.
Logged
ChemBuddy chemical calculators - stoichiometry, pH, concentration, buffer preparation, titrations.info

Offline Bob Sacamano

  • Regular Member
  • ***
  • Posts: 63
  • Mole Snacks: +1/-3
Re: What is the equilibrium when HCl is added to an aq solution of cobalt chloride?
« Reply #2 on: September 18, 2010, 01:15:37 PM »
At first I thought:

[Co(H2O)6]2+ + 4Cl- ⇔ [CoCl4]2- + 6H2O

Then I thought:

[Co(H2O)6]2+ + 2Cl- ⇔ [CoCl2(H2O)2] + 4H2O
Logged

Offline Borek

  • Mr. pH
  • Administrator
  • Deity Member
  • *
  • Posts: 27655
  • Mole Snacks: +1801/-410
  • Gender: Male
  • I am known to be occasionally wrong.
    • Chembuddy
Re: What is the equilibrium when HCl is added to an aq solution of cobalt chloride?
« Reply #3 on: September 18, 2010, 02:20:33 PM »
I would say both answers are to some extent correct. I don't have data on this particular system at hand, but the equilibrium is often multistep, with water molecules being replaced by other ligands one by one.

I wonder if there really is a change of the molecule geometry as you suggest.
Logged
ChemBuddy chemical calculators - stoichiometry, pH, concentration, buffer preparation, titrations.info
Pages: [1]   Go Up
« previous next »
Sponsored Links