January 11, 2025, 02:59:12 PM
Forum Rules: Read This Before Posting


« previous next »
Pages: [1]   Go Down

Topic: pH deionized water  (Read 8653 times)

0 Members and 1 Guest are viewing this topic.

Offline tchristides

  • New Member
  • **
  • Posts: 3
  • Mole Snacks: +0/-0
pH deionized water
« on: June 13, 2009, 05:56:28 PM »
Why is the pH of my double deionized water less than 7?  It's about 6.4.
Logged

Offline Borek

  • Mr. pH
  • Administrator
  • Deity Member
  • *
  • Posts: 27895
  • Mole Snacks: +1816/-412
  • Gender: Male
  • I am known to be occasionally wrong.
    • Chembuddy
Re: pH deionized water
« Reply #1 on: June 13, 2009, 06:07:47 PM »
CO2.
Logged
ChemBuddy chemical calculators - stoichiometry, pH, concentration, buffer preparation, titrations.info

Offline Johnny010

  • Regular Member
  • ***
  • Posts: 25
  • Mole Snacks: +1/-2
Re: pH deionized water
« Reply #2 on: August 20, 2009, 07:32:03 AM »
CO2 dissolves and forms carbonic acid.
If the deionisation was done under strict inert atmosphere then the pH would have been 7.

http://209.85.229.132/search?q=cache:pNeRYArS0jEJ:www.thuisexperimenteren.nl/infopages/Carbondioxide%2520in%2520water%2520equilibrium.doc+solubility+of+CO2&cd=4&hl=en&ct=clnk&gl=uk&client=firefox-a

If you wish to read up about it. I think this goes into the whole Ka values and such.
Logged
Pages: [1]   Go Up
« previous next »
Sponsored Links