Which of the following aqueous solution will be basic?
Correct answer: C. Na2CO3
- A. NaCl
- B. Na2SO4
- C. Na2CO3
- D. FeCl3
Explanation
When dissolved in water, Na2CO3 undergoes hydrolysis, where water molecules react with the carbonate ion (CO3^2-) to produce hydroxide ions (OH-) and bicarbonate ions (HCO3-).This reaction increases the OH- concentration in the solution, making it basic. The equation for the hydrolysis is:CO3^2- + H2O ⇌ HCO3- + OH-
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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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