I think it was a typing error - a matter of mind racing ahead of the
fingers :-) - Calcium carbonate is insoluble in water its what
sea-shells are made of.
Sodium bicarbonate (baking soda) and sodium carbonate (washing soda) are
both highly soluble in water When you heat baking soda above 70 c , it
looses on e carbon dioxide (NaHCO3 -> Na2CO3) , ignore stoichiometry for
now, and it becomes washing soda.
When you add this to water containing Calcium (probably Calcium
Chloride) they swap parts and the resulting Calcium carbonate
precipitates out of solution and you get de-calcified water.
Sodium Carbonate + Calcium Chloride ->Sodium Chloride + Calcium Carbonate
hope that helps.
regards
hg
PT Ferrance wrote:
I'm confused. Daddy Bob said he uses calcium carbonate to precipitate
out calcium and then said we could make our own by baking sodium
bicarbonate. Am I missing something here?
Thanks.
PT
------------------------------------------------------------------------
*From:* Frank <[email protected]>
*To:* [email protected]
*Sent:* Mon, January 10, 2011 7:52:13 AM
*Subject:* Re: CS>Precipitating calcium before distillation
Hi sodium bicarbonate “baked” at 350F may become sodium carbonate, NOT
calcium carbonate.
Cheers
*From:* PT Ferrance <mailto:[email protected]>
*Sent:* Sunday, January 09, 2011 11:14 PM
*To:* [email protected] <mailto:[email protected]>
*Subject:* Re: CS>Precipitating calcium before distillation
Hi,
Can anyone tell me why baking 'sodium' bicarbonate at 350 degrees for
2-2.5 hours will become 'calcium' carbonate? How does sodium
magically become calcium?
Thanks.
PT
------------------------------------------------------------------------
*From:* "[email protected]" <[email protected]>
*To:* [email protected]
*Sent:* Mon, January 3, 2011 12:49:40 PM
*Subject:* CS>Precipitating calcium before distillation
For years I wanted my own water distiller but I knew that my calcium
carbonate loaded water would prematurely destroy one. We have to
vigorously
clean any pot after boiling water in it and have to religiously
descale the
coffee maker. I also wanted to build my own larger scale water
distiller but
the same problem applied- not worth the money and trouble because of the
rapid calcium buildup.
I have finally found two methods that will bring this closer to
reality for
me but have very practical applications already.
I now de-calcify nearly all our drinking water. We do it in the common 5
gallon polycarbonate water jugs thusly:
The secret precipitating agent is not at all a secret- it's calcium
carbonate- plain old washing soda. It's still made by Arm & Hammer and can
be bought on eBay if you can't find it locally. The dose for my water is
about 1/2 teaspoon per gallon. Stir in and dissolve well and watch the
calcium cloud the water then fall to the bottom of the jug. About 24 hours
later, siphon off with a small tube and through a funnel with several
coffee
filters. I use my filters over many times.
Concerned about non-food grade calcium carbonate? Make your own.
Spread some
baking soda out in a pan and bake it at 350F for 2-2.5 hours.
This preemptive process should add much life to any distiller.
The best calcium cleaning solution I ever used in a coffee maker will
probably work fine for distillers too: Standard 5% white vinegar to
which I
add powdered citric acid until it turns yellow.
DaddyBob
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