Re: Volcanic fumes kill teenage campers

SBC Yahoo wrote:
"Gary Reichlinger" <reichln@xxxxxxxxx> wrote in message news:pmj7935457fokm0p710njprpug5k148ib7@xxxxxxxxxx
On Tue, 10 Jul 2007 14:16:10 -0400, "George" <george@xxxxxxxxxxxxxxx>
wrote:

"Gary Reichlinger" <reichln@xxxxxxxxx> wrote in message
news:ab37939v6b3501oqoocvnhtim88jo7jgrg@xxxxxxxxxx
On Tue, 10 Jul 2007 00:38:37 -0400, "George" <george@xxxxxxxxxxxxxxx>
wrote:

But then, it's use generates CO2 and you're back to step one.
It depends on how you use it. As a cleaning product, the
carbonate would stay in solution.
Until you dispose of it.
It either stays in solution or precipitates out as a solid.
There is not a direct path back to CO2 without some outside process.


The Chemical formula is

CO2 + Ca(OH)2 - -> CaCO3 + H2O

It is not a reversible Process. But adding lime to water containing carbon dioxide will precipitate Calcium Carbonate as a solid, leaving pure water behind. The amount of lime required to remove carbon dioxide is around 10-15 mg/liter.

Better living through chemistry, as they say. I bet there is some nut somewhere that has discovered "true chemistry", though.

I have discovered "true chemistry".

H2O + CO2 +CaCO3 --> Ca++ + 2HCO3-

CO2 + H2O --> H2CO3 (i.e. carbonic acid)

H2CO3(aq)--> HCO3- + H+
HCO3 --> CO3(2-) + H+

You have free hydrogens in water, you have carbonic acid.

You have carbonic acid:
CaCO3 + H2O + CO2 --> Ca++ = 2 HCO3-

ALL of the CaCO3 equations are very easily reversible.

(Equationstaken from Dr. Will White and Elizabeth White: Geomorphology and Hydrology of Karst Terrains (1988)

We spent about 1/3 of a 16 week aqueous geochemistry class on these equations alone. (Believe me, the actual ionic quantative equations are way way more complex than this-- I don't have the symbolic capability to render those equations in ASCII.

Dissolution of CaCO3 is highly dependent upon the pH of the dissolving solution. Even a partially buffered, alkaline solution (pH 7-8) can (and does) dissolve 400 tons of CaCO3 out of a spring supply system flowing 286 million gallons of water a day.

Regular rainwater on a karst terrain in air does even more.

Deposition of CaCO3 offgasses one CO2-- that is, it is only 50% efficient at sequestration. Pumping more CO2 into a finite amount of water will increase its pH. If pumped into CaCO3 or any carbonate (dolomite, gypsum, chalk, etc.) it will initially be buffered, but over time, acid trumps rock every time.

Water plus CO2 is a pretty picture because it both creates and fills caves. But it is a dynamic system. Got it?


.

Relevant Pages

  • Re: Pitmans Miller Time
    ... England and the southern North Sea basin are? ... redeposited chalk from adjacent shallower areas. ... times as dense as water. ... (Less dense than much other Calcium Carbonate.) ...
    (talk.origins)
  • Re: Pitmans Miller Time
    ... England and the southern North Sea basin are? ... redeposited chalk from adjacent shallower areas. ... times as dense as water. ... (Less dense than much other Calcium Carbonate.) ...
    (talk.origins)
  • Re: Pitmans Miller Time
    ... >England and the southern North Sea basin are? ... redeposited chalk from adjacent shallower areas. ... Calcium Carbonate is about 0.1% by mass of sea water. ...
    (talk.origins)
  • Homebrew Digest #5493 (February 02, 2009)
    ... TODAY'S HOME BREW DIGEST BROUGHT TO YOU BY: ... Subject: How Much Alkalinity ... If one puts 100 mg of chalk in a beaker and adds water to ... is the fraction which is carbonate. ...
    (rec.crafts.brewing)
  • Re: recarbonating soda (was "Re: spray paint can question")
    ... I am greatly interested in making my own carbonated water. ... >> tank, ... You can use it to carbonate beer ... With larger co2 tank savings are ...
    (rec.crafts.metalworking)