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Practical Guide
Chemistry
Investigating pH
This document contains:
Links to YouTube clips showing the practical procedure
Information from examination boards AQA, OCR, Edexcel
Potential examination questions and answers
This resource is strictly for the use of member schools for as long as they remain members of The PiXL Club. It may not be copied, sold nor transferred to a third party or used by the school after membership ceases. Until such time it may be freely used within the member school.
All opinions and contributions are those of the authors. The contents of this resource are not connected with nor endorsed by any other company, organisation or institution.
Commissioned by The PiXL Club Ltd. November 2016
The PiXL Club Ltd, Company number
© Copyright The PiXL Club Ltd, 2016

2. Required practical – exam boards
AQA
Edexcel
OCR

3. Practical procedure: Rates of Reaction
Video 1
Video 2
Click on each of the tabs to take you to a YouTube clip. Please note these are external sites to PiXL, PiXL does not control the content of these sites.
Images from:

4. Possible examination style questions
Write a word equation for the reaction between calcium oxide and hydrochloric acid.
Write a balanced symbol equation for the reaction between calcium hydroxide, Ca(OH)2, and hydrochloric acid.
Name two methods for monitoring the pH of a reaction.
Explain how you could use the data obtained to plot a graph in order to determine the mass of calcium oxide required to neutralise hydrochloric acid.

5. Possible examination style questions answers
Write a word equation for the reaction between calcium oxide and hydrochloric acid.
ANS:
Calcium Oxide + Hydrochloric Acid
Calcium Chloride + Water

6. Possible examination style questions answers
Write a balanced symbol equation for the reaction between calcium hydroxide, Ca(OH)2, and hydrochloric acid.
ANS:
2HCl + Ca(OH) CaCl2 + 2H2O
Correct symbols
Correct products
Correct balancing

7. Possible examination style questions answers
Name two methods for monitoring the pH of a reaction.
ANS:
Universal indicator paper/ solution
pH probe

8. Possible examination style questions answers
Explain how you could use the data obtained to plot a graph in order to determine the mass of calcium oxide required to neutralise hydrochloric acid.
ANS:
Plot line graph
Mass Calcium oxide on x-axis; pH on y-axis
Line of best fit
Draw line from pH 7 to hit line of best fit and then down to mass of calcium oxide

9. Key questions:
What is the best piece of apparatus to measure the volume of hydrochloric acid?
Why is that the best piece of apparatus?
How do you use universal indicator paper to measure the pH of the solution?
Why is it necessary to stir the mixture when the calcium hydroxide powder is added?
What are the main errors in this experiment?
How could you improve the method?
How do you know when the hydrochloric acid is exactly neutralised?

10. Summary document
A summary document is also available on Huddle which contains all the relevant information about this practical from the different examination boards. This document includes practical methods and other potential examination questions