01 ropanoic acid dissociates slightly in aqueous solution.
01.1 Write an expression for the acid dissociation constant Ka for propanoic acid. P
[1 mark]
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AQA A-Level Chemistry – Paper 1 - Predicted Paper
2022 V5
Organic/Physical Practical Chemistry (University of Leicester)
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,A-Level Chemistry
AQA
Paper 1 – Inorganic and Physical Chemistry
Predicted Paper 2022
Name ……………….
Date …………………
2 hours allowed
Possible Marks
Question
marks gained
1 9
2 8
3 8
4 14
5 15
6 14
7 10
8 8
9 19
Total 105
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of what is covered in the exam. The information was given in ranked order,
and this has been reflected in the mark allocation and topics on this paper.
There are questions in this paper that cover topics that are not listed by the
exam board. These are in the multiple-choice section and a few marks in low
tariff and synoptic questions – this is exactly what you should expect in the
exam.
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, 01 Propanoic acid dissociates slightly in aqueous solution.
01.1 Write an expression for the acid dissociation constant Ka for propanoic
acid.
[1 mark]
……………………………………………………………………………………………………………………
……………………………………………………………………………………………………………………
01.2 The Ka value of propanoic acid is 1.35×10-5 moldm-3.
A buffer solution is prepared containing 2.15×10-2 mol of propanoic
acid and 1.50×10-2 mol of sodium propanoate in 1.00 dm3 solution.
I. Calculate the pH of the buffer solution 25°C.
[3 marks]
……………………………………………………………………………………………………………
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II. A small amount of aqueous NH3(aq) is added to the buffer solution.
Explain how the buffer solution would respond to the added NH3(aq).
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