2006-07-22 16:48:41 · 9 answers · asked by Anonymous in Science & Mathematics ➔ Chemistry
I want it in raw form
2006-07-22 16:53:58 · update #1
The crystal form of the mineral calcite or aragonite will be relatively pure calcium carbonate, more so than limestone.
Sea shells without the nacre (the shiny coat) are calcium carbonate with some trace elements. Chalk, made from coccolithophores is calcium carbonate. Limestone is also calcium carbonate, and will have various amounts of trace elements and possibly some small proportions of magnesium carbonate and iron carbonate. Some limestone contains trace amounts of arsenic, so I would be cautious if you use this source and intend to ingest it. As an example, the Redwall Limestone in the Grand Canyon is 99.9% calcium carbonate, while most Florida limestone has a much higher percentage of impurities, including arsenic.
Antacids such as Tums (tm) are made from calcium carbonate but have sugar, talc, corn starch, mineral oil and a few other things added.
Because CaOH has such low solubility, the above suggested reactions will not make much calcium carbonate. Calcium hydroxide has a solubility of about 1 gram per liter at room temperature. This reaction will give very small quantities of CaCO3 that would hardly even be visible.
If you have a source of calcium chloride, you can add baking soda, which is sodium bicarbonate, and you will get a precipitate of calcium carbonate, which has a low solubility product.
This is the reaction:
[Ca(2+) & Cl-] + [Na+ & H+ & CO3(2-)] -> CaCO3 & [Na+ & Cl-] & [H+ & Cl-]
You can buy calcium chloride in aquarium supply stores, but it seems counterproductive to take a chemical that is originally derived from calcium carbonate and convert it back. It would be easier and cheaper to buy calcium carbonate.
2006-07-22 17:32:20 · answer #1 · answered by carbonates 7 · 1⤊ 0⤋
The calcium oxide/carbon dioxide idea is interesting.
The method Wikipedia says is used in industry is:
Ca(OH)2 + CO2 ---> CaCO3
This is an attractive, one pot synthesis. The CO2 could just be bubbled through a solution of Calcium Hydroxide. The CaCO3 would crash out of the solution.
2006-07-22 17:21:57 · answer #2 · answered by niuchemist 6 · 1⤊ 0⤋
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Calcium sulphate + water + carbon dioxide. Is this it?
2016-04-03 12:33:18 · answer #3 · answered by Anonymous · 0⤊ 0⤋
What are you starting with? I believe that if you grind up sea shells they are mostly CaCO3. How about limestone?
2006-07-22 16:53:04 · answer #4 · answered by rscanner 6 · 0⤊ 0⤋
Why not just buy some antacid in the store? Its primarily CaCo3.
2006-07-22 16:53:14 · answer #5 · answered by eric l 6 · 0⤊ 0⤋
I'm not sure if this would work but you could do:
CaOH + Na2CO3 --> CaCO3 + NaOH
2006-07-22 17:17:25 · answer #6 · answered by BeC 4 · 0⤊ 0⤋
Ca+O--> CaO
CaO+CO2-->CaCO3
2006-07-22 18:10:01 · answer #7 · answered by nareshk 2 1 · 0⤊ 0⤋
I CAN MAKE BY MIXING CALCIUMOXIDE AND CARBON DIOXIDE
2006-07-22 17:11:21 · answer #8 · answered by Anonymous · 0⤊ 0⤋
maybe ground bone but not positive
2006-07-22 16:52:26 · answer #9 · answered by mjk6886@yahoo.com 3 · 0⤊ 0⤋
Hope this helps!
2015-05-01 18:15:23 · answer #10 · answered by Anonymous · 0⤊ 0⤋