A student is performing a titration to analyze a solution of sodium hydroxide (NaOH\text{NaOH}NaOH).
The student measures 25.0 cm325.0\text{ cm}^325.0 cm3 of sodium hydroxide solution with a concentration of 4.80 g/dm34.80\text{ g/dm}^34.80 g/dm3. Calculate the mass of sodium hydroxide in this sample. Use the conversion: 1 dm3=1000 cm31\text{ dm}^3 = 1000\text{ cm}^31 dm3=1000 cm3.
During the titration, the following volumes of dilute sulfuric acid were recorded to neutralize the sodium hydroxide:
Identify the anomalous trial and calculate the mean volume of acid used, using only the concordant results.