25.00cm3 of sodium hydroxide was pipetted into a conical flask. It was titrated against 0.10mol/dm3 hydrochloric acid. The mean volume of acid needed was 24.00cm3. Calculate the concentration of sodium hydroxide used in the titration.
First write out the chemical equation:
HCl + NaOH -> NaCl + H20
Next construct a table with the information we have and in what units.
Next write out what calculation triangle we need:
Number of moles = vol in dm3 X concentration = 0.0024 mol
One mole of HCl: one mole of NaOH, therefore 0.0024mol of NaOH
Concentration = no of moles / vol in dm3 = 0.096 mol/dm3 to 2dp.
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