炭酸水素カルシウム、重炭酸カルシウム

WordNet

a white metallic element that burns with a brilliant light; the fifth most abundant element in the earths crust; an important component of most plants and animals (同)Ca, atomic number 20
a salt of carbonic acid (containing the anion HCO3) in which one hydrogen atom has been replaced; an acid carbonate (同)hydrogen_carbonate

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『カルシウム』(金属元素;化学記号は『Ca』)
重炭酸塩

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出典(authority):フリー百科事典『ウィキペディア（Wikipedia）』「2014/07/15 21:28:38」(JST)

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Calcium bicarbonate, also called calcium hydrogen carbonate, has a chemical formula Ca(HCO₃)₂. The term does not refer to a known solid compound; it exists only in aqueous solution containing the calcium (Ca²⁺), bicarbonate (HCO₃^–), and carbonate (CO₃^2–) ions, together with dissolved carbon dioxide (CO₂). The relative concentrations of these carbon-containing species depend on the pH; bicarbonate predominates within the range 6.36-10.25 in fresh water.

All waters in contact with the atmosphere absorb carbon dioxide, and as these waters come into contact with rocks and sediments they acquire metal ions, most commonly calcium and magnesium, so most natural waters that come from streams, lakes, and especially wells, can be regarded as dilute solutions of these bicarbonates. These hard waters tend to form carbonate scale in pipes and boilers and they react with soaps to form an undesirable scum.

Attempts to prepare compounds such as calcium bicarbonate by evaporating its solution to dryness invariably yield the solid carbonate instead: Ca(HCO₃)₂(aq) → CO₂(g) + H₂O(l) + CaCO₃(s).^[1] Very few solid bicarbonates other than those of the alkali metals and ammonium ion are known to exist.

The above reaction is very important to the formation of stalactites, stalagmites, columns, and other speleothems within caves and, for that matter, in the formation of the caves themselves. As water containing carbon dioxide (including extra CO₂ acquired from soil organisms) passes through limestone or other calcium carbonate containing minerals, it dissolves part of the calcium carbonate and hence becomes richer in bicarbonate. As the groundwater enters the cave, the excess carbon dioxide is released from the solution of the bicarbonate, causing the much less soluble calcium carbonate to be deposited.

Dissolved carbon dioxide (CO₂) in rainwater (H₂O) reacts with limestone, calcium carbonate (CaCO₃) to form soluble calcium bicarbonate (Ca(HCO₃)₂). This soluble compound is then washed away with the rainwater. This is form of weathering is called 'Carbonation'.

References

^ http://www.newton.dep.anl.gov/askasci/chem99/chem99492.htm

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1. 乳酸アシドーシスにおける重炭酸療法 bicarbonate therapy in lactic acidosis
2. 総血清カルシウムとイオン化血清カルシウム濃度の相関 relation between total and ionized serum calcium concentrations
3. 成人における再発性カルシウム結石の予防 prevention of recurrent calcium stones in adults
4. 小児蘇生法における第一選択剤 primary drugs in pediatric resuscitation
5. 成人における高カリウム血症の治療および予防 treatment and prevention of hyperkalemia in adults

English Journal

Hydrogeochemistry and statistical analysis applied to understand fluoride provenance in the Guarani Aquifer System, Southern Brazil.

Marimon MP, Roisenberg A, Suhogusoff AV, Viero AP.SourceDepartamento de Geologia, Instituto de Geociências, Universidade Federal do Rio Grande do Sul, Avenida Bento Gonçalves, 9500, Porto Alegre, RS, CEP 91501-970, Brazil.
Environmental geochemistry and health.Environ Geochem Health.2012 Nov 13. [Epub ahead of print]
High fluoride concentrations (up to 11 mg/L) have been reported in the groundwater of the Guarani Aquifer System (Santa Maria Formation) in the central region of the state of Rio Grande do Sul, Southern Brazil. In this area, dental fluorosis is an endemic disease. This paper presents the geochemica
PMID 23149723

A patient with foot ulcer and severe metabolic alkalosis.

John RS, Simoes S, Reddi AS.SourceDepartment of Medicine, Division of Nephrology & Hypertension, UMDNJ-New Jersey Medical School, Newark, NJ 07103, USA.
The American journal of emergency medicine.Am J Emerg Med.2012 Jan;30(1):260.e5-8. doi: 10.1016/j.ajem.2010.10.035. Epub 2010 Dec 24.
We report a case of triple acid-base disorder with metabolic alkalosis as the primary disorder in a 65-year-old man due to ingestion and application to leg ulcers of baking soda (calcium bicarbonate). The blood pH was 7.65 with hypochloremia, hypokalemia, and prerenal azotemia. He was treated with i
PMID 21185672

Japanese Journal

鳥骨炭による溶液中のフッ素除去メカニズム

宮崎光,長澤詩織,本山亜友里,川上智規
土木学会論文集G（環境） 70(7), III_527-III_534, 2014
　骨炭を用いると溶液中からフッ素を除去することができる．このメカニズムとしては主にF-とOH-とのイオン交換であるとされてきた．しかしながら，鳥骨炭でフッ素を除去した後の溶液のpHを測定してみても大きく上昇することはないため，フッ素除去のメカニズムは単純なF-とOH-とのイオン交換では説明することはできない．そこで，フッ素除去のメカニズムを溶液中の各イオン成分の動きにより検討した．　その結果，F- …
NAID 130004962668

09-3 New approach to water treatments: hydrology, balneotherapy and thalassotherapy the new health tourism

CERRADA Alberto
日本温泉気候物理医学会雑誌 77(5), 490-491, 2014
… Climatological conditions are special and the thermal waters rich in sulfur, bicarbonate, calcium, magnesium and radon.<BR> Traditional programs as rheumatological treatments, rehabilitation, respiratory, dermatological and digestive by hydropinic cure, but there is a new concept: The medical offer can be extended and divided in several units:<BR>- Fertility and women unity. …
NAID 130004719523

11-2 Biophysical effects after cutaneous application of dermatological products made from sediment of mineral waters Lanjarón-Capuchina by skin bioengineering methods

CARBAJO José Manuel,AGUILERA Lourdes,Martin-MEGIAS Ana Isabel,MARAVER Francisco
日本温泉気候物理医学会雑誌 77(5), 505-506, 2014
… calcium (Ca2+): 1.423 mg/l; … bicarbonate (HCO3-): 1.732 mg/l and iron (Fe2+): 28 mg/l ».<BR>Objectives: The main objective of the present study was to determine the in situ biomechanical behaviour of skin in response to the use of two dermatologic products manufactured from the sediments (saline muds) of Capuchina water. …
NAID 130004719517

「重炭酸カルシウム」

Calcium bicarbonate
	IUPAC name Calcium hydrogen carbonate
	Other names Calcium bicarbonate
Identifiers
PubChem	10176262
ChemSpider	8351767
Jmol-3D images	Image 1
	SMILES [Ca+2].[O-]C(=O)O.[O-]C(=O)O ;
	InChI InChI=1S/2CH2O3.Ca/c22-1(3)4;/h2(H2,2,3,4);/q;;+2/p-2 ; Key: NKWPZUCBCARRDP-UHFFFAOYSA-L InChI=1/2CH2O3.Ca/c22-1(3)4;/h2(H2,2,3,4);/q;;+2/p-2; Key: NKWPZUCBCARRDP-NUQVWONBAN ;
Properties
Molecular formula	Ca(HCO3)2
Molar mass	162.11464 g/mol
Solubility in water	16.1 g/100 mL (0 °C); 16.6 g/100 mL (20°C); 18.4 g/100 mL (100 °C)
Hazards
R-phrases	R36
Main hazards	Irritant
Flash point	Non-Flammable
	Except where noted otherwise, data are given for materials in their standard state (at 25 °C (77 °F), 100 kPa)
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	Infobox references