DP Chemistry (last assessment 2024)
Question 18M.2.sl.TZ2.c
| Date | May 2018 | Marks available | [Maximum mark: 1] | Reference code | 18M.2.sl.TZ2.c |
| Level | sl | Paper | 2 | Time zone | TZ2 |
| Command term | Outline | Question number | c | Adapted from | N/A |
c.
[Maximum mark: 1]
18M.2.sl.TZ2.c
Graphing is an important tool in the study of rates of chemical reactions.
Outline why pH is more widely used than [H+] for measuring relative acidity.
[1]
Markscheme
«pH» converts «wide range of [H+]» into simple «log» scale/numbers
OR
«pH» avoids need for exponential/scientific notation
OR
«pH» converts small numbers into values «typically» between 0/1 and 14
OR
«pH» allows easy comparison of values of [H+]
Accept “uses values between 0/1 and 14”.
Do not accept “easier to use”.
Do not accept “easier for calculations”.
[1 mark]
