Is it possible for a diprotic acid to have Ka1?

Chemistry

1 answer:

Masja [62]3 years ago

4 0

Answer:

Yes, it is possible.

Explanation:

A diprotic acid is an acid that can release two protons. That's why it is called diprotic.

Monoprotic → Release one proton, for example Formic acid HCOOH

Triprotic → Releases three protons, for example H₃PO₄

Polyprotic → Release many protons, for example EDTA

it is a weak acid.

In the first equilibrum, it release proton, and the second is released in the second equilibrium. So the first equilibrium will have a Ka1

H₂A + H₂O ⇄ H₃O⁺ + HA⁻ Ka₁

HA⁻ + H₂O ⇄ H₃O⁺ + A⁻² Ka₂

The HA⁻ will work as an amphoterous because, it can be a base or an acid, according to this:

HA⁻ + H₂O ⇄ H₃O⁺ + A⁻² Ka₂

HA⁻ + H₂O ⇄ OH⁻ + H₂A Kb₂

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