DP Chemistry (first assessment 2025)
Question 19M.2.HL.TZ1.1c(i)
| Date | May 2019 | Marks available | [Maximum mark: 1] | Reference code | 19M.2.HL.TZ1.1c(i) |
| Level | HL | Paper | 2 | Time zone | TZ1 |
| Command term | Write | Question number | c(i) | Adapted from | N/A |
c(i).
[Maximum mark: 1]
19M.2.HL.TZ1.1c(i)
(c(i))
Write the equation for the production of the active nitrating agent from concentrated sulfuric and nitric acids.
[1]
Markscheme
2H2SO4 + HNO3 ⇌ NO2+ + 2HSO4− + H3O+ [✔]
Note: Accept a single arrow instead of an equilibrium sign.
Accept “H2SO4 + HNO3 ⇌ NO2+ + HSO4− + H2O”.
Accept “H2SO4 + HNO3 ⇌ H2NO3+ + HSO4−”.
Accept equivalent two step reactions in which sulfuric acid first behaves as a strong acid and protonates the nitric acid, before behaving as a dehydrating agent removing water from it.
Examiners report
The production of NO3− was a common answer.
Syllabus sections
Reactivity 3. What are the mechanisms of chemical change? » Reactivity 3.4—Electron-pair sharing reactions » Reactivity 3.4.13—Electrophilic substitution reactions include the reactions of benzene with electrophiles. Describe and explain the mechanism of the reaction between benzene and a charged electrophile, E+.