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碳酸氢钙

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碳酸氢钙
IUPAC名
Calcium bicarbonate
碳酸氢钙
识别
CAS号 3983-19-5  checkY
PubChem 10176262
ChemSpider 8351767
InChI
 
  • 1/2CH2O3.Ca/c2*2-1(3)4;/h2*(H2,2,3,4);/q;;+2/p-2
InChIKey NKWPZUCBCARRDP-NUQVWONBAN
性质
化学式 Ca(HCO3)2
摩尔质量 162.11464 g·mol⁻¹
溶解性 0.0161 g/100 mL (0 °C)
0.016 g/100 mL (20°C)
分解 (100 °C)
危险性
闪点 不可燃
若非注明,所有数据均出自标准状态(25 ℃,100 kPa)下。

碳酸氢钙(化学式:Ca(HCO3)2),是一种无机酸式盐[1]

产生碳酸氢钙最重要的化学反应即是以碳酸钙溶于二氧化碳水溶液而成碳酸氢钙,反应式如下:

Ca(OH)2 + CO2 → CaCO3↓ + H2O
CaCO3 + H2O + CO2 → Ca(HCO3)2

这是在石灰水中通入过量二氧化碳时会变回透明的原因。

碳酸氢钙微溶于水,但碳酸钙难溶。钟乳石的形状即是由微溶的碳酸氢钙与难溶的碳酸钙在一定二氧化碳浓度下的互相转变造成的。

碳酸氢钙只存在溶液中;将碳酸氢钙溶液蒸发则得到碳酸钙固体。

化学性质

碳酸氢钙不稳定,稍受热或者压强突然减小即可分解:

Ca(HCO3)2 → CaCO3 + H2O + CO2

它也可以和酸反应,产生钙盐:

Ca(HCO3)2 + 2 HCl → CaCl2 + 2 H2O + 2 CO2

参照

参考文献

  1. ^ https://www.chemicalbook.com/NewsInfo_14299.htm
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碳酸氢钙
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