DP Chemistry (last assessment 2024)

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Question 18M.2.hl.TZ1.c

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Date May 2018 Marks available [Maximum mark: 2] Reference code 18M.2.hl.TZ1.c
Level hl Paper 2 Time zone TZ1
Command term Apply Question number c Adapted from N/A
c.
[Maximum mark: 2]
18M.2.hl.TZ1.c

Limescale, CaCO3(s), can be removed from water kettles by using vinegar, a dilute solution of ethanoic acid, CH3COOH(aq).

Write an equation to show ammonia, NH3, acting as a Brønsted–Lowry base and a different equation to show it acting as a Lewis base.

 

[2]

Markscheme

Brønsted–Lowry base:

NH3 + H+ → NH4+

Lewis base:

NH3 + BF3 → H3NBF3

 

Accept “AlCl3 as an example of Lewis acid”.

Accept other valid equations such as Cu2+ + 4NH3 → [Cu(NH3)4]2+.

[2 marks]

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