DP Chemistry (last assessment 2024)

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Question 18M.2.hl.TZ2.2d.i

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Date May 2018 Marks available [Maximum mark: 2] Reference code 18M.2.hl.TZ2.2d.i
Level hl Paper 2 Time zone TZ2
Command term Deduce Question number d.i Adapted from N/A
d.i.
[Maximum mark: 2]
18M.2.hl.TZ2.2d.i

Graphing is an important tool in the study of rates of chemical reactions.

(d.i)

The graph represents the titration of 25.00 cm3 of 0.100 mol dm−3 aqueous ethanoic acid with 0.100 mol dm−3 aqueous sodium hydroxide.

M18/4/CHEMI/HP2/ENG/TZ2/02.d.i_01

Deduce the major species, other than water and sodium ions, present at points A and B during the titration.

 

[2]

Markscheme

A: CH3COOH/ethanoic/acetic acid AND CH3COO–/ethanoate/acetate ions

B: CH3COO–/ethanoate/acetate ions

 

Penalize “sodium ethanoate/acetate” instead of “ethanoate/acetate ions” only once.

[2 marks]

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