Question #18b0f

1 Answer
anor277
Mar 16, 2017

Well is #"calcium oxide"# known............?

Explanation:

#"Calcium oxide"# or quicklime is certainly known. Formally it contains #Ca^(2+)# and #O^(2-)# ions. The high melting and boiling points observed for this compound are certainly consistent with an ionic species.

In aqueous solution #CaO# reacts to give an aqueous solution of so-called #"slaked lime"#:

#CaO(s) + H_2O(l) rarr Ca(OH)_2(aq) +Delta#

This reaction is the basis for the cement and mortar industry, mix in aggregate, i.e. crushed stone, and you get concrete, the premier building material of modernity.

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