Which of the following 0.10 M aqueous solutions will have the highest electrical conductivity? (Assume complete dissociation for strong electrolytes.)
Show the answer and explanation
Correct answer
C. Potassium sulfate (K2SO4)
Principle or equation
Electrical conductivity of a solution depends on the concentration of ions. Strong electrolytes dissociate completely, producing more ions per formula unit. Nonelectrolytes produce no ions; weak electrolytes produce few ions.
Why this answer is correct
Sucrose is a nonelectrolyte (no ions). Acetic acid is a weak electrolyte (few ions). Ammonia is a weak base (few ions). Potassium sulfate is a strong electrolyte: K2SO4 → 2K⁺ + SO₄²⁻, producing 3 ions per formula unit, the highest ion concentration among the options.
Example
0.10 M NaCl produces 0.20 M ions; 0.10 M CaCl2 produces 0.30 M ions.
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