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Multiple Choice
Which of the following is NOT a strong electrolyte?
A
KNO3 (potassium nitrate)
B
HCl (hydrochloric acid)
C
CH3COOH (acetic acid)
D
NaCl (sodium chloride)
Verified step by step guidance
1
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.
Identify the substances given: KNO3 (potassium nitrate), HCl (hydrochloric acid), CH3COOH (acetic acid), and NaCl (sodium chloride).
Recall that KNO3, HCl, and NaCl are all strong electrolytes because they fully dissociate into their respective ions in aqueous solution.
Recognize that CH3COOH (acetic acid) is a weak acid and does not fully dissociate in water; it exists mostly as molecules with only a small fraction ionized.
Conclude that since CH3COOH does not completely ionize, it is NOT a strong electrolyte, unlike the other substances listed.