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


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