The aqueous solution of which of the following is acidic?
Correct answer: C. CuCl₂
- A. CH₃COONa
- B. NaCN
- C. CuCl₂
- D. Na₂CO₃
Explanation
Copper(II) chloride (CuCl₂) is a salt of a weak base (Cu(OH)₂) and a strong acid (HCl). The Cu²⁺ ion hydrolyzes water to produce H⁺ ions, making the solution 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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