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Date May 2012 Marks available 1 Reference code 12M.1.hl.TZ2.23
Level HL Paper 1 Time zone TZ2
Command term Question number 23 Adapted from N/A

Question

Which reaction represents an acid–base reaction according to the Lewis theory but not according to the Brønsted–Lowry theory?

A.     \({\text{CO}}_3^{2 - }({\text{aq)}} + {{\text{H}}_3}{{\text{O}}^ + }({\text{aq)}} \rightleftharpoons {{\text{H}}_2}{\text{O(l)}} + {\text{HCO}}_3^ - {\text{(aq)}}\)

B.     \({\text{C}}{{\text{H}}_3}{\text{COOH(aq)}} + {\text{N}}{{\text{H}}_3}({\text{aq)}} \rightleftharpoons {\text{NH}}_4^ + ({\text{aq)}} + {\text{C}}{{\text{H}}_3}{\text{CO}}{{\text{O}}^ - }({\text{aq)}}\)

C.     \({\text{N}}{{\text{H}}_3}({\text{aq)}} + {\text{HF(aq)}} \rightleftharpoons {\text{NH}}_4^ + ({\text{aq)}} + {{\text{F}}^ - }({\text{aq)}}\)

D.     \({\rm{CuS}}{{\rm{O}}_{\rm{4}}}{\rm{(s)}} + 5{{\rm{H}}_{\rm{2}}}{\rm{O(l)}} \rightleftharpoons {\rm{CuS}}{{\rm{O}}_{\rm{4}}}{\rm{ \bullet 5}}{{\rm{H}}_{\rm{2}}}{\rm{O(s)}}\)

Markscheme

D

Examiners report

[N/A]

Syllabus sections

Additional higher level (AHL) » Topic 18: Acids and bases » 18.1 Lewis acids and bases
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