Question

Look at the reaction below.

Answer 1

Answer:

Ca(OH)2 (aq)

Explanation:

The base in the reaction would be Ca(OH)2 (aq).

A base is a substance which when dissolved in water, releases $OH^-$ as the only negative ion.  A base is also a substance that donates electrons and accept protons in a reaction.

Ca(OH)2 in aqueous solution will ionize thus:

$Ca(OH)_2 (aq) --> Ca^{2+} (aq) + OH^- (aq)$

In a reaction involving an acid, the hydroxyl ion donates its electron and accept proton.

$H^+ + OH^- --> H_2O$