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Exam (elaborations)

Pearson Edexcel Level GCE In Chemistry (8CH0) Paper 02: Core Organic and Physical Chemistry QP & MS JUNE 2024

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Answer ALL questions. Some questions must be answered with a cross in a box . If you change your mind about an answer, put a line through the box and then mark your new answer with a cross . 1 The relative molecular mass of a solid dicarboxylic acid, HOOC(CH2)nCOOH, can be found using a titration. The acid, which can be represented as H2A, was dissolved in deionised water and the solution made up to 250cm3. (a) Which piece of apparatus should be used for making a solution with a volume of exactly 250 cm3 ? A burette B measuring cylinder C pipette D volumetric flask (b) A solution of 0.100moldm–3 sodium hydroxide solution was added to a burette. A rough titration was carried out on a 25.0cm3 portion of the acid solution. (i) The diagram shows the burette before the rough titration. What is the initial burette reading for this titration? 2.0 3.0 A 2.40 cm3 B 2.45 cm3 C 3.55 cm3 D 3.60cm3 2 (1) (1) ■■■■ DO NOT WRITE IN THIS AREA DO NOT WRITE IN THIS AREA DO NOT WRITE IN THIS AREA(ii) The final burette reading for the rough titration was 26.50cm3. Calculate the volume of sodium hydroxide solution added in the rough titration, using your answer to (b)(i). (iii) Describe how you would use the rough titration value when carrying out the accurate titrations. (1) (1

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Pearson Edexcel AS Level GCE In Chemistry P
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Pearson Edexcel AS Level GCE In Chemistry P

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Uploaded on
December 17, 2024
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Written in
2024/2025
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Pearson Edexcel AS Level GCE In Chemistry (8CH0) Paper 02: Core
Organic and Physical Chemistry QP & MS JUNE 2024

, Candidate surname Other names


Centre Number Candidate Number




Paper


Chemistry

■ ■


Advanced Subsidiary
Marks
PAPER 2: Core Organic and Physical Chemistry



.
Turn over


P76894A
©2024 Pearson Education Ltd.
F:1/1/1/1/

, Answer ALL questions.

Some questions must be answered with a cross in a box . If you change your mind about an




DO NOT WRITE IN THIS AREA
answer, put a line through the box and then mark your new answer with a cross .

1 The relative molecular mass of a solid dicarboxylic acid, HOOC(CH2)nCOOH, can be
found using a titration. The acid, which can be represented as H2A, was dissolved in
deionised water and the solution made up to 250 cm3.
(a) Which piece of apparatus should be used for making a solution with a volume of
exactly 250 cm3 ?
(1)
A burette

B measuring cylinder
C pipette

D volumetric flask




DO NOT WRITE IN THIS AREA
(b) A solution of 0.100 mol dm–3 sodium hydroxide solution was added to a burette.
A rough titration was carried out on a 25.0 cm3 portion of the acid solution.
(i) The diagram shows the burette before the rough titration.

What is the initial burette reading for this titration?
(1)

2.0




DO NOT WRITE IN THIS AREA

3.0


A 2.40 cm3

B 2.45 cm3

C 3.55 cm3

D 3.60 cm3




2
■■■■

, (ii) The final burette reading for the rough titration was 26.50 cm3.
Calculate the volume of sodium hydroxide solution added in the
DO NOT WRITE IN THIS AREA




rough titration, using your answer to (b)(i).
(1)




(iii) Describe how you would use the rough titration value when carrying out the
accurate titrations.
(1)

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DO NOT WRITE IN THIS AREA




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. .. .. ... .. .. ... .. ... .. .. ... .. .. ... .. .. ... .. ... .. .. ... .. .. ... .. .. ... .. .. .. .. ... .. .. ... .. ... .. .. ... .. .. ... .. .. ... .. ... .. .. ... .. .. .. ... .. .. .. ... .. .. ... .. ... .. .. ... .. .. ... .. .. ... .. ... .. .. ... .. .. ... .. .. ... .. .. .. .. ... .. .. ... .. ... .. .. ... .. .. ... .. .. ... .. ... .. . . . ......................
DO NOT WRITE IN THIS AREA




3
■■■■ Turn over

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