Scelta multipla
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
Scelta multipla
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)
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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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