Multiple Choice
For which of the following aqueous salts will electrolysis produce hydrogen gas at the cathode and oxygen gas at the anode?
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6. Chemical Quantities & Aqueous Reactions
Electrolytes
Multiple Choice
Which of the following solutions will be the best conductor of electrical current?
A
0.1 M C6H12O6(aq) (glucose)
B
0.1 M NH3(aq)
C
0.1 M CH3COOH(aq)
D
0.1 M NaCl(aq)
Verified step by step guidance1
Understand that electrical conductivity in aqueous solutions depends on the presence of ions, which carry electric current. Substances that dissociate into ions in water are good conductors.
Analyze each solution: Glucose (C6H12O6) is a molecular compound and does not ionize in water, so it produces no ions and thus conducts poorly.
Ammonia (NH3) is a weak base and partially ionizes in water to produce some OH⁻ and NH4⁺ ions, but the ion concentration is low, so conductivity is limited.
Acetic acid (CH3COOH) is a weak acid and partially ionizes into CH3COO⁻ and H⁺ ions, providing some conductivity but less than a strong electrolyte.
Sodium chloride (NaCl) is a strong electrolyte and completely dissociates into Na⁺ and Cl⁻ ions, resulting in the highest concentration of ions and therefore the best electrical conductivity.
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