ChemistryAminesClass 12

Amines: basicity and diazotisation: interactive simulation

In water the basicity order is methylamine > ammonia > aniline. Aniline’s lone pair is delocalised into the ring. The diazonium salt from aniline is kept at 0–5 °C.

Useful for: JEE Main, JEE Advanced, NEET, CBSE Boards · 2 modes in one lab

What you can explore

  1. 1

    Basicity order

    pKb bars for aniline, ammonia and methylamine.
  2. 2

    Diazotisation

    Aniline, cold nitrous acid, then what happens if the salt is warmed.

Try this

  1. 1

    Select aniline, then methylamine.

    What you should see

    pKb falls from 9.38 to 3.36. The smaller pKb is the stronger base.

  2. 2

    Play the diazotisation frames past the cold step.

    What you should see

    Warming the solution drives off nitrogen and phenol forms in water.

Formulas behind it

pKb

pKb=−log⁡10Kb\mathrm{p}K_b = -\log_{10} K_b

Common mistakes

  • Ranking aniline as a stronger base than ammonia because it is an amine. In water it is weaker.
Stuck on a amines: basicity and diazotisation question?Snap it and get a whiteboard video solution.

FAQ

Why must diazotisation stay cold?

Benzenediazonium chloride loses N₂ as soon as it warms up.

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