One molar solution is acidic for
Correct answer: C. FeCl₃
- A. KI
- B. CH₃COONH₄
- C. FeCl₃
- D. None
Explanation
The correct answer is FeCl₃. FeCl₃ is formed from a weak base (Fe(OH)₃) and a strong acid (HCl), making the solution acidic due to the hydrolysis of the Fe³⁺ ion, which increases the concentration of H⁺ ions. KI is neutral because it is formed from a strong acid and a strong base. CH₃COONH₄ is generally neutral as it involves a weak acid and a weak base. Thus, None is incorrect because FeCl₃ is indeed acidic.
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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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