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From the list below, find the total number of acids that are diprotic (release exactly two ionisable protons): H3PO4, H2SO4, H3PO3, H2CO3, H2S2O7, H3BO3, H3PO2, H2CrO4, H2SO3

1. 5
2. 6
3. 7
4. 4

Correct answer: 6

Solution

The diprotic acids are those releasing exactly two protons: H2SO4, H3PO3, H2CO3, H2S2O7, H2CrO4, and H2SO3, giving a total of six. H3PO4 is triprotic, H3PO2 and H3BO3 are monoprotic.

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