DP Chemistry (first assessment 2025)
Question 19M.1A.SL.TZ1.31
| Date | May 2019 | Marks available | [Maximum mark: 1] | Reference code | 19M.1A.SL.TZ1.31 |
| Level | SL | Paper | 1A | Time zone | TZ1 |
| Command term | Question number | 31 | Adapted from | N/A |
31.
[Maximum mark: 1]
19M.1A.SL.TZ1.31
Which is not a requirement of the standard hydrogen electrode (SHE)?
A. V = 1 dm3
B. p(H2) = 100 kPa
C. use of platinum as the electrode material
D. [H3O+] = 1 mol dm−3
[1]
Markscheme
A
Examiners report
This was a poorly answered question on the standard hydrogen electrode. Many candidates believed what was not required was a Pt electrode material
Syllabus sections
Reactivity 3. What are the mechanisms of chemical change? » Reactivity 3.2—Electron transfer reactions » Reactivity 3.2.12—The hydrogen half-cell H+(aq) + e− ⇌12 H2(g) is assigned a standard electrode potential of zero by convention. It is used in the measurement of standard electrode potential, E⦵. Interpret standard electrode potential data in terms of ease of oxidation/reduction.