Does CO2 have a pH? Does it matter?

  • Does CO2 have a pH? Does it matter?

    Posted by moondoggy on June 4, 2025 at 6:05 pm

    The Safety Data Sheet from my CO2 tank supply company, under Physical and Chemical Properties …says the pH is 3.7. Should I adjust my feeding schedule’s pH to account for the CO2 being a pH 3.7?

    Does this mean the plant is abosrbing 3.7 pH similar to how it does by foliar feeding with absorbing water and nutrients?

    • This discussion was modified 4 weeks, 1 day ago by  moondoggy.
    jmystro replied 4 weeks ago 3 Members · 2 Replies
  • 2 Replies
  • melonfarmer

    Member
    June 4, 2025 at 7:05 pm
    Free Membership

    I don’t know this for a fact, but I would imagine that’s the pH of the liquid CO2, it even says carbonic acid on the label. When you dilute it in the air to 1000 parts per million it’s 1000 times more dilute.

    I’ve never heard of anyone pH’ing their air but now I’m kind of curious lol

    • jmystro

      Moderator
      June 4, 2025 at 9:02 pm
      AdministratorFree MembershipDGC Executive Producer

      Don’t inject CO2 into a nutrient reservoir and you’ll be fine. CO2 in the air will not affect the pH of a reservoir unless you’re pumping high CO2 grow room air into the reservoir. Pumping CO2 into your reservoir will create carbonic acid. Carbonic acid helped erode the limestone that created the Grand Canyon. Carbon, like silica can create bonds on 4 sides. Carbon is reactive and allows structures to build in a reservoir like sludge.

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