An experiment is performed to find the volume of hydrochloric acid (HCl\text{HCl}HCl) required to neutralise a solution of sodium hydroxide (NaOH\text{NaOH}NaOH).
What name is given to this analytical method?
Which piece of apparatus should be used to measure exactly 25.0 cm325.0\text{ cm}^325.0 cm3 of the sodium hydroxide solution into the reaction flask:
State the colours that are seen if phenolphthalein is used as the indicator in this neutralisation reaction:
A student carries out the experiment. Their initial and final burette readings are shown below:
Use the descriptions and diagram to complete the following readings to the nearest 0.05 cm30.05\text{ cm}^30.05 cm3:
A second student repeated the titration four times, using a different concentration of sodium hydroxide. The table shows their results:
| Run | 1 | 2 | 3 | 4 |
|---|---|---|---|---|
| Volume of acid added (cm3\text{cm}^3cm3) | 23.65 | 23.15 | 23.25 | 23.20 |
Concordant results are those within 0.20 cm30.20\text{ cm}^30.20 cm3 of one another. Identify which runs are concordant with one another.
Use your chosen concordant results to calculate the average (mean) volume of acid added.
