A student carries out an experiment to produce a precipitate of iron(III) hydroxide, Fe(OH)3\text{Fe(OH)}_3Fe(OH)3, using the following reaction:
FeCl3(aq)+3NaOH(aq)→Fe(OH)3(s)+3NaCl(aq) \text{FeCl}_3(\text{aq}) + 3\text{NaOH}(\text{aq}) \rightarrow \text{Fe(OH)}_3(\text{s}) + 3\text{NaCl}(\text{aq}) FeCl3(aq)+3NaOH(aq)→Fe(OH)3(s)+3NaCl(aq)They find that 15.0 cm315.0\text{ cm}^315.0 cm3 of 0.12 mol/dm30.12\text{ mol/dm}^30.12 mol/dm3 FeCl3\text{FeCl}_3FeCl3 solution reacts exactly with 18.0 cm318.0\text{ cm}^318.0 cm3 of NaOH\text{NaOH}NaOH solution.
Calculate the concentration, in mol/dm3\text{mol/dm}^3mol/dm3, of the NaOH\text{NaOH}NaOH solution.
