The sequence of dissociation reactions of carbonic acid is a follows:
Further Explanation:
An acid is a substance that is able to donate a proton or hydrogen ion in aqueous solutions. Hydrochloric acid (HCl), sulphuric acid and nitric acid are some examples of acids. On the basis of the number of protons an acid can donate, acids can be monoprotic or polyprotic.
Acids that can donate just one proton in aqueous solutions are called monoprotic acids. For example, HCl, and are monoprotic acids as these can donate only one proton in solutions.
Polyprotic acids can donate more than one proton in aqueous solutions. These can further be divided as diprotic, triprotic and so on. Diprotic acids are the ones that can donate two protons in solutions. For example, and are diprotic acids. Triprotic acids are capable to donate three protons in solutions. For example, and are triprotic acids.
Carbonic acid has the chemical formula of . So it dissociates into an aqueous solution, releasing protons or hydrogen ions in it. Since carbonic acid is a diprotic acid, its dissociation takes place in two steps.
Step 1: The first dissociation of occurs as follows:
Here, is the first dissociation constant of .
Step 2: In the second dissociation, dissociates as follows:
Here, is the first dissociation constant of .
Learn more:
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Answer details:
Grade: High School
Chapter: Acid, base and salts.
Subject: Chemistry
Keywords: acids, monoprotic, polyprotic, HCl, H2CO3, H2SO4, HNO3, CH3COOH, dissociation, Ka1, Ka2.