March 29, 2024, 02:57:15 AM
Forum Rules: Read This Before Posting


Topic: determining equilibrium constant  (Read 1684 times)

0 Members and 1 Guest are viewing this topic.

Offline Soyeon

  • Very New Member
  • *
  • Posts: 2
  • Mole Snacks: +0/-0
determining equilibrium constant
« on: March 04, 2018, 11:03:43 PM »
Hi, my lab is about determining equilibrium constant and I need to make a calibration curve about absorbance and concentration of FeSCN 2+.

The concentration of Fe3+ solution is 0.150M, and SCN- solution is 5.00x10^-4 M. And I also usded HNO3 solution

Solution      Volume of Fe3+   Volume of SCN-     Volume of HNO3
1                    10.00                     0                         15.00
2                    10.00                    2.00                      13.00
3                    10.00                    5.00                     10.00
4                    10.00                    8.00                     7.00
5                    10.00                    10.00                   5.00

How can I calculate the concentration of FeSCN2+ (the complex)?               
« Last Edit: March 05, 2018, 12:04:20 AM by Soyeon »

Offline Borek

  • Mr. pH
  • Administrator
  • Deity Member
  • *
  • Posts: 27633
  • Mole Snacks: +1799/-410
  • Gender: Male
  • I am known to be occasionally wrong.
    • Chembuddy
Re: determining equilibrium constant
« Reply #1 on: March 05, 2018, 02:55:54 AM »
How can I calculate the concentration of FeSCN2+ (the complex)?

In general you can't without knowing the equilibrium constant or the molar absorptivity, but perhaps there is something about the procedure that makes it possible.
ChemBuddy chemical calculators - stoichiometry, pH, concentration, buffer preparation, titrations.info

Sponsored Links