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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
Question 2
In this question you will be assessed on using good English, organising information clearly and using specialist terms where appropriate. A student has to check if ... show full transcript
Worked Solution & Example Answer: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
Step 1
Describe how to prepare the Burette and Pipette
Answer
- Rinse the burette with distilled water first, followed by rinsing it with the hydrochloric acid solution A, ensuring that any leftover water is removed.
- Fill the burette with hydrochloric acid A using a funnel and remove the funnel afterward to avoid any drips affecting the titration reading.
- Rinse the pipette with distilled water, followed by rinsing it with sodium hydroxide solution, then use the pipette to measure a set volume (e.g., 25 ml) of sodium hydroxide solution into the conical flask.
Step 2
Describe the Titration Process
Answer
- Place the conical flask on a white tile under the burette to assist in visualising the end point.
- Add a few drops of a suitable pH indicator to the sodium hydroxide solution in the conical flask. This will allow the color change to indicate the endpoint.
- Slowly add hydrochloric acid A from the burette to the conical flask while constantly swirling the flask to mix the solutions until the indicator shows a clear color change, indicating the reaction is complete.
Step 3
Describe the Comparison with Hydrochloric Acid B
Answer
- Repeat the titration using hydrochloric acid B instead of A, following the same procedure.
- Compare the volume of hydrochloric acid A and B used to reach the endpoint. If the volumes used are the same, then both samples are considered to have the same concentration.