A student performs a titration to find the concentration of a sodium hydroxide solution, NaOH\text{NaOH}NaOH, using a 0.0500 mol/dm3 solution of sulfuric acid, H2SO4\text{H}_2\text{SO}_4H2SO4.
In each titration, the student transfers 25.0 cm3 of the sodium hydroxide solution into a conical flask using a pipette.
The table shows the volume of acid added in four titration runs:
Titration run1234Volume of acid added (cm3)24.6023.9024.1024.00\begin{array}{|l|c|c|c|c|} \hline \text{Titration run} & 1 & 2 & 3 & 4 \\ \hline \text{Volume of acid added (cm}^3\text{)} & 24.60 & 23.90 & 24.10 & 24.00 \\ \hline \end{array}Titration runVolume of acid added (cm3)124.60223.90324.10424.00Concordant results are those within 0.20 cm3 of each other. Identify the concordant results and use them to calculate the average (mean) volume of acid added.
The equation for the reaction is:
H2SO4+2NaOH→Na2SO4+2H2O \text{H}_2\text{SO}_4 + 2\text{NaOH} \rightarrow \text{Na}_2\text{SO}_4 + 2\text{H}_2\text{O} H2SO4+2NaOH→Na2SO4+2H2OCalculate the concentration, in mol/dm3\text{mol/dm}^3mol/dm3, of the sodium hydroxide solution.
