Multiple Choice
Which of the following substances is a weak electrolyte in aqueous solution?
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6. Chemical Quantities & Aqueous Reactions
Electrolytes
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Which of the following compounds is a strong electrolyte in aqueous solution?
A
NH3
B
HCl
C
KCl
D
HC2H3O2
Verified step by step guidance1
Understand what a strong electrolyte is: a substance that completely dissociates into ions when dissolved in water, resulting in a solution that conducts electricity very well.
Analyze each compound to determine if it dissociates fully in aqueous solution:
NH3 (ammonia) is a weak base and does not fully ionize in water; it partially reacts to form NH4+ and OH- ions, so it is a weak electrolyte.
HCl (hydrochloric acid) is a strong acid and completely dissociates into H+ and Cl- ions in water, making it a strong electrolyte.
KCl (potassium chloride) is an ionic salt that fully dissociates into K+ and Cl- ions in water, so it is also a strong electrolyte, whereas HC2H3O2 (acetic acid) is a weak acid and only partially ionizes.
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