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base anhydride
The oxides of group 1 and 2 elements (alkali metals and alkaline earth metals) are called base anhydrides. They are obtained by removing water from the corresponding hydroxide salt. If water is added to a base anhydride, a corresponding hydroxide base can be re-formed. A base anhydride is neither an Arrhenius base, nor a Brønsted–Lowry base, since it does not accept protons and do not increase the hydroxide ion concentration of water. However, a base anhydride is a Lewis base, since it will share an electron pair with some Lewis acids, most notably acidic oxides.〔Principles of Modern Chemistry, 7th Edition. David Oxtoby, H. P. Gillis, Alan Campion. Published by Cengage Learning. Page 675-676. ISBN 978-0840049315〕
== Examples ==
* Calcium oxide is the anhydride of calcium hydroxide
* Barium oxide is the anhydride of barium hydroxide
* Sodium oxide is the anhydride of sodium hydroxide
* Potassium oxide is the anhydride of potassium hydroxide
* Strontium oxide is the anhydride of strontium hydroxide
* Lithium oxide is the anhydride of lithium hydroxide
* Cesium oxide is the anhydride of cesium hydroxide
* Rubidium oxide is the anhydride of rubidium hydroxide
抄文引用元・出典: フリー百科事典『 ウィキペディア（Wikipedia）』
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