DP Chemistry (first assessment 2025)
Question 19N.1B.SL.TZ0.c(i)
| Date | November 2019 | Marks available | [Maximum mark: 1] | Reference code | 19N.1B.SL.TZ0.c(i) |
| Level | SL | Paper | 1B | Time zone | TZ0 |
| Command term | Justify | Question number | c(i) | Adapted from | N/A |
c(i).
[Maximum mark: 1]
19N.1B.SL.TZ0.c(i)
Justify this hypothesis.
[1]
Markscheme
sulfuric acid is diprotic/contains two H+ «while nitric acid contains one H+»/releases more H+ «so reacts with more limestone»
OR
higher concentration of protons/H+ ✔
NOTE: Ignore any reference to the relative strengths of sulfuric acid and nitric acid.
Accept “sulfuric acid has two hydrogens «whereas nitric has one»”.
Accept "dibasic" for "diprotic".
