Re: Volcanic fumes kill teenage campers

On Tue, 10 Jul 2007 18:35:50 -0500, Jo Schaper

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.

True, but he was adding lime to the water which would make it
strongly alkaline. In the case of the sodium carbonate production
system, chlorine (or HCl) is removed from salt water (electrolysis
cell) resulting in a very alkaline sodium hydroxide solution. The
reaction with CO2 to produce sodium carbonate also takes place under
alkaline conditions. In either case, if you remove the carbonate end
product from the solution, you have eliminated any route toward
reversibility. If it was not the plan to remove it from solution,
sodium carbonate is much more soluable than CaCO3 and would make a
better sequestering agent.
.

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