A student titrates a standard solution of barium hydroxide, Ba(OH)2\text{Ba(OH)}_2Ba(OH)2, with hydrochloric acid, HCl\text{HCl}HCl.
25.00 cm3 of 0.0520 mol dm-3 Ba(OH)2\text{Ba(OH)}_2Ba(OH)2 are needed to neutralise 21.40 cm3 of HCl(aq)\text{HCl(aq)}HCl(aq).
What is the concentration, in mol dm−3\text{mol dm}^{-3}mol dm−3, of the hydrochloric acid?
0.03040.03040.0304
0.06070.06070.0607
0.1210.1210.121
0.2430.2430.243
