Exam (elaborations)
A level OCR Chemistry A- Paper 3 June 2024 (Question Paper)
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This is the original question Paper for the OCR A-level Chemistry A Paper 3- Unified Chemistry 2024
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Oxford Cambridge and RSAFriday 21 June 2024 – Morning
A Level Chemistry A
H432/03 Unified chemistry
Time allowed: 1 hour 30 minutes
You must have:
* 1 3 4 9 5 9 3 8 8 3 *
• the Data Sheet for Chemistry A
You can use:
• a scientific or graphical calculator
• an HB pencil
* H 4 3 2 0 3 *
Please write clearly in black ink. Do not write in the barcodes.
Centre number Candidate number
First name(s)
Last name
INSTRUCTIONS
• Use black ink. You can use an HB pencil, but only for graphs and diagrams.
• Write your answer to each question in the space provided. If you need extra space use
the lined pages at the end of this booklet. The question numbers must be clearly shown.
• Answer all the questions.
• Where appropriate, your answer should be supported with working. Marks might be
given for using a correct method, even if your answer is wrong.
INFORMATION
• The total mark for this paper is 70.
• The marks for each question are shown in brackets [ ].
• Quality of extended response will be assessed in questions marked with an asterisk (*).
• This document has 20 pages.
ADVICE
• Read each question carefully before you start your answer.
© OCR 2024 [601/5255/2] OCR is an exempt Charity
DC (PQ/SW) 331429/6 Turn over
, 2
1 This question is about acids, bases and salts.
(a) What is the pH of 1.00 dm3 of 0.400 mol dm–3 of NaOH(aq) at 298 K?
pH = ................... [2]
(b) Water is added to 10.0 cm3 of 0.750 mol dm–3 HCl (aq) to produce 100 cm3 of diluted HCl (aq).
What is the pH of the diluted HCl (aq)?
Give your answer to 2 decimal places.
pH = ................... [1]
(c) A solution has concentrations of 0.300 mol dm–3 CH3COOH(aq) and 0.100 mol dm–3
CH3COONa(aq).
Ka for CH3COOH = 1.75 × 10–5 mol dm–3 at 298 K.
What is the pH of the solution at 298 K?
Give your answer to 2 decimal places.
pH = ................... [2]
© OCR 2024
, 3
(d) A student is provided with hydrated copper(II) nitrate, Cu(NO3)2•3H2O.
The student needs to prepare a standard solution of Cu(NO3)2•3H2O with a concentration of
0.200 mol dm–3. The student has access to usual laboratory apparatus and equipment.
Describe how the student would prepare 100.0 cm3 of this solution, giving quantities, apparatus
and method.
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© OCR 2024 Turn over
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