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CAIE A-Level Chemistry 34.1.3 Basicity of Aqueous Amines

Practise explaining aqueous amine basicity through proton acceptance and nitrogen lone-pair availability.

Syllabus
2028–2030
Course
Chemistry 9701
Level
A2

Exam points

  • write RNH2 + H2O ⇌ RNH3+ + OH− to show the nitrogen lone pair accepting a proton from water
  • draw the salt formed when an amine accepts H+ from a carboxylic or mineral acid
  • link higher basicity to alkyl electron donation increasing electron density and lone-pair availability on nitrogen

34.1.3—Basicity of aq. solutions of amines question 1

[Maximum number: 3]

Copper is a transition element and has atomic number 29.

Question (a)

(a)

Ethane-1,2-diamine is a useful reagent in organic chemistry.

[ 3 ]

Question (i)

(i)

Explain how the amino groups in ethane-1,2-diamine allow the molecule to act as a Brønsted-Lowry base.

[ 2 ]

Question (ii)

(ii)

Write an equation for the reaction of ethane-1,2-diamine with an excess of hydrochloric acid.

[ 1 ]
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