DP Chemistry (first assessment 2025)
Question EXM.1B.SL.TZ0.1aii
| Date | May Example question | Marks available | [Maximum mark: 3] | Reference code | EXM.1B.SL.TZ0.1aii |
| Level | SL | Paper | 1B | Time zone | TZ0 |
| Command term | Calculate | Question number | ii | Adapted from | N/A |
ii.
[Maximum mark: 3]
EXM.1B.SL.TZ0.1aii
(ii)
Calculate the initial % content of Fe2+ in the raw spinach, showing your working.
[3]
Markscheme
«mol» MnO4− «=0.00339 × 0.01» = 3.38 × 10−5 «mol» ✓
«mol MnO4−: mol Fe+2 = 1:5»
«mol» Fe2+ = 1.95 × 10−4 ✓
% Fe2+ «= 1.95 × 10−4 × 55.8 × 100/2.0»= 0.47«%» ✓
Must show working for the marks.
