DP Chemistry (last assessment 2024)

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Question 19M.2.hl.TZ1.1c(i)

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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)

Xylene is a derivative of benzene. One isomer is 1,4-dimethylbenzene.

Xylene, like benzene, can be nitrated.

(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.

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