Re: pH required to decompose calcite?

On Sun, 24 Jul 2005 20:14:02 +0200, Repeating Rifle <salmonegg@xxxxxxxxxxxxx> wrote:

How would I go about calculating the pH at which calcium carbonate
(limestone, calcite, marble) decomposes to give carbon dioxide? Getting a
source of such information is good enough.


General lectures on pH calculation:

http://www.chembuddy.com/?left=pH-calculation&right=toc

While the lectures are concentrated on the pH calculation, they
contain all necessary information for equlibrium calculation.
Overall dissociation constants should be easier to use in your
calculations.

What chemical equations do I have to consider? 

CO3(2-) protonation (two steps). First dissociation constants
are given as if the concentration of carbonic acid was the same
as concentration of dissolved carbon dixoide.

What equilibrium constants do I need to know? 

pKa1 = 6.4, pKa2 = 10.3

Is there anything else? 

Probably, but you already have enough to think about ;)

Best,
Borek
--
http://www.chembuddy.com - chemical calculators for labs and education
BATE - program for pH calculations
CASC - Concentration and Solution Calculator
pH lectures - guide to hand pH calculation with examples
.

Relevant Pages

  • Re: CO2 Emissions
    ... Specific Gravity of Butane = 0.573 ... As Propane contains 3 carbon atoms & Butane 4 atoms of carbon:- ... If your calculation is somewhere near, ...
    (uk.rec.cars.fuel.lpg)
  • Re: CO2 Emissions
    ... Specific Gravity of Butane = 0.573 ... As Propane contains 3 carbon atoms & Butane 4 atoms of carbon:- ... If your calculation is somewhere near, ...
    (uk.rec.cars.fuel.lpg)
  • Re: [ot] bulk nanotube sheeting
    ... produce large sheets of material made from carbon nanotubes... ... I just did a calculation (that is probably wrong in some obvious ...
    (rec.arts.sf.written)
  • RE: Very basic question
    ... Lectures are what you ask for when you ... Everyone who posts here is on the learning curve somewhere - some high up on ... hierarchy through simple queries and subtotals. ... calculation in access quick than you can retrive some forms of data so it ...
    (microsoft.public.access.gettingstarted)
  • Re: chemistry sites
    ... Henry Boyter, Jr. ... >> interested in analytical or organic chem... ... > concentration and pH calculation. ... > pH lectures - guide to hand pH calculation with examples ...
    (sci.chem.analytical)