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Base anhydride
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<h2 id="examples">Examples</h2> <ul><li>Quicklime (<a href="/facts/Calcium_oxide/Wh9C8l7j">calcium oxide</a>) is a base anhydride. It reacts with water to become hydrated lime (<a href="/facts/Calcium_hydroxide/Kz2KzRd8">calcium hydroxide</a>),<a class="footnote-ref" id="fnref:2" href="#fn:2"><sup>2</sup></a> which is a <a href="/facts/Base_(chemistry)/M9wA7qeM">strong base</a>, chemically akin to <a href="/facts/Lye/bdB2nPFk">lye</a>. This reaction is exothermic.<a class="footnote-ref" id="fnref:3" href="#fn:3"><sup>3</sup></a></li></ul> CaO + H2O → Ca(OH)2 (ΔHr = −63.7 kJ/mol of CaO) <ul><li><a href="/facts/Sodium_oxide/QbdIGb8u">Sodium oxide</a> is a very strong base that reacts readily and irreversibly with water to give <a href="/facts/Sodium_hydroxide/xjtdYtq7">sodium hydroxide</a>:<a class="footnote-ref" id="fnref:4" href="#fn:4"><sup>4</sup></a></li></ul> Na2O + H2O → 2 NaOH <h2 id="see-also">See also</h2> <ul><li><a href="/facts/Acid_anhydride/0LvHIgAY">Acid anhydride</a></li> <li><a href="/facts/Acidic_oxide/2h1jor4I">Acidic oxide</a></li></ul> <h2 id="references">References</h2> <ol> <li id="fn:1"><p>Principles of Modern Chemistry, 7th Edition. David Oxtoby, H. P. Gillis, Alan Campion. Published by Cengage Learning. Page 675-676. ISBN 978-0840049315 <a href="/wiki/David_W._Oxtoby" target="_blank">/wiki/David_W._Oxtoby</a> <a href="#fnref:1" class="footnote-back-ref">↩</a></p></li> <li id="fn:2"><p>Collie, Robert L. "Solar heating system" U.S. patent 3,955,554 issued May 11, 1976 <a href="https://patents.google.com/patent/US3955554" target="_blank">https://patents.google.com/patent/US3955554</a> <a href="#fnref:2" class="footnote-back-ref">↩</a></p></li> <li id="fn:3"><p>Collie, Robert L. "Solar heating system" U.S. patent 3,955,554 issued May 11, 1976 <a href="https://patents.google.com/patent/US3955554" target="_blank">https://patents.google.com/patent/US3955554</a> <a href="#fnref:3" class="footnote-back-ref">↩</a></p></li> <li id="fn:4"><p>"Sodium oxide". International Labor Organization. <a href="https://chemicalsafety.ilo.org/dyn/icsc/showcard.display?p_card_id=1653" target="_blank">https://chemicalsafety.ilo.org/dyn/icsc/showcard.display?p_card_id=1653</a> <a href="#fnref:4" class="footnote-back-ref">↩</a></p></li> </ol>