Question

Look at the reaction below.

Upper H subscript 2 upper S upper O subscript 4 (a q) plus upper C a (upper O upper H) subscript 2 (a q) right arrow upper C a upper S upper O subscript 4 (a q) plus 2 upper H subscript 2 upper O (l).

Which substance is the base in the reaction?
2H2O (l)
H2SO4 (aq)
CaSO4 (aq)
Ca(OH)2 (aq)

Answer 1

Ca(OH)2 (aq)

Reason: H2SO4 is the acid (donates H+), and Ca(OH)2 supplies OH− (or accepts H+), forming water — so Ca(OH)2 is the base.