Phosphoric acid is a tribasic acid. What mass of calcium hydroxide, Ca(OH)2\text{Ca(OH)}_2Ca(OH)2, is required to completely neutralise 450 cm3 of 0.150 mol dm-3 phosphoric acid?
1.67 g1.67\text{ g}1.67 g
3.33 g3.33\text{ g}3.33 g
5.00 g5.00\text{ g}5.00 g
7.50 g7.50\text{ g}7.50 g
