July 22, 2024, 01:20:45 PM
Forum Rules: Read This Before Posting


Topic: COD Determination  (Read 4083 times)

0 Members and 1 Guest are viewing this topic.

Offline lingo_belle

  • Regular Member
  • ***
  • Posts: 13
  • Mole Snacks: +0/-0
COD Determination
« on: February 20, 2008, 07:45:00 AM »
Hi all,

I'm doing COD determination with potassium permanganate. I do know that it's not a stable titrant thus I standardized it with sodium oxalate. May I know if it's necessary for me to do so every time before I start the titrations? Can I standardized it once, and use the stock for every titrations? How abt if it was to left overnight? Will it affect the freshness of the stock?

Thanks all

belle

Offline Borek

  • Mr. pH
  • Administrator
  • Deity Member
  • *
  • Posts: 27749
  • Mole Snacks: +1804/-411
  • Gender: Male
  • I am known to be occasionally wrong.
    • Chembuddy
Re: COD Determination
« Reply #1 on: February 20, 2008, 07:52:16 AM »
If you have defined operating procedure - stick to it. If you don't - keep the solution in the dark bottle in the dark place. Standarization on the daily basis doesn't make sense, either once a week or once a month will be enough. Try by yourself - for the first month do it every week, you will have good idea about the solution stability.
ChemBuddy chemical calculators - stoichiometry, pH, concentration, buffer preparation, titrations.info

Sponsored Links