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They both mean the same thing:

acid molecules with 2 protons: e.g. H2O and H2S and ....

H2S --> H+ + HS-

HS- --> H+ + S2-

The two sulfides (HS- and S2-) are both base, so H2S is dibasic (= forming two bases)

Two protons are freed, so H2S is diprotic (= forming two protons)

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Q: Difference between dibasic acid and diprotic acid?
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What is the difference between monobasic and dibasic acids?

A monobasic acid releases on H+ when dissolved in water. Whereas a dibasic acid will release 2.


What is biprotic acid?

Diprotic or dibasic acids are those which may produce two protons (H+ ions) per molecule in aqueous solutions as H2SO4.


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Is permanganic acid a diprotic acid?

No, permanganic acid (HMnO4) is monoprotic.


Why is phosphorus acid dibasic?

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