DP Chemistry (last assessment 2024)
Question 18M.2.hl.TZ2.d.i
| Date | May 2018 | Marks available | [Maximum mark: 2] | Reference code | 18M.2.hl.TZ2.d.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.d.i
Graphing is an important tool in the study of rates of chemical reactions.
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.
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]