In this question you will be assessed on using good English, organising information clearly and using specialist terms where appropriate - AQA - GCSE Chemistry - Question 2 - 2016 - Paper 3

Gather the Apparatus: Ensure that the burette, pipette, conical flask, white tile, and the samples of hydrochloric acid A and B are available along with the sodium hydroxide solution and an indicator.

Fill the Burette: Rinse the burette with distilled water followed by sodium hydroxide solution. Fill the burette with sodium hydroxide and record the initial volume.

Prepare the Sample: Use the pipette to measure a specific volume of hydrochloric acid A, typically 25 cm³, and transfer it into the conical flask. Add a few drops of the chosen indicator into the flask.

Titration Process: Place the conical flask on the white tile under the burette. Slowly add sodium hydroxide from the burette to the hydrochloric acid in the flask while swirling the flask to ensure proper mixing. Continue adding until a color change occurs, indicating the endpoint has been reached.

Record Final Volume: Note the final volume of sodium hydroxide in the burette, then calculate the volume used by subtracting the initial volume from the final volume.

Repeat for Hydrochloric Acid B: Repeat the steps using hydrochloric acid B to find the volume of sodium hydroxide needed to reach the endpoint. Compare the volume of sodium hydroxide used with both samples. If the volumes are equal, then the concentrations of hydrochloric acid A and B are the same.