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HCO3- and HPO4 2- can both accept and donate protons. In this way, they are considered amphiprotic and can be used as an acid or a base in the reaction. If they are an acid, they lose the hydrogen in the reaction. If they are basic, they gain a hydrogen in the reaction.
ishaa Diwakar 4E wrote:H2CO3 and H2SO4 are considered diprotic, meaning they usually lose two protons as anions. So, when they lose only one, they are able to lose one more and act as an acid, even with a negative charge.
What characteristics of these compounds shows that they are diprotic?
The main characteristic is that they have the potential to donate two protons (H+) since there are two H atoms per molecule. For example, with H2SO4, the first equation would be: H2SO4 + H2O --> HSO4- + H3O+ , and the second equation would be: HSO4- + H2O --> SO4 2- + H3O+
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