Which of the following ions can act both as bronsted acid and base in solvent water?
Correct answer: C. CHO3-
- A. CN-
- B. SO4-2
- C. CHO3-
- D. PO4-3
Explanation
CHO3- can act as a Bronsted acid and a Bronsted base. A Bronsted acid is a species that donates a proton (H+), while a Bronsted base is a species that accepts a proton(H+). - In the presence of a stronger base, such as OH-, the H+ ion in CHO3- can be donated to form H2O and CO32-. This reaction makes CHO3- act as a Bronsted acid. - In the presence of a stronger acid, such as HCl, CHO3- can accept an H+ ion to form H2CO3. This reaction makes CHO3- act as a Bronsted base.
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About Acids, Bases and Salts
Acid and base behaviour is explained through the Bronsted-Lowry transfer of protons and the Lewis donation or acceptance of electron pairs. The topic includes pH, pOH, ionisation and water equilibrium, plus salt formation and hydrolysis, where a salt solution may become acidic, basic or neutral.
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