Multiple Choice
Which one of the following can be classified as a weak electrolyte?
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6. Chemical Quantities & Aqueous Reactions
Electrolytes
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Which of the following substances completely dissociates in water?
A
NH_3
B
NaCl
C
H_2O
D
CH_3COOH
Verified step by step guidance1
Understand the concept of dissociation in water: substances that completely dissociate in water are typically strong electrolytes, such as strong acids, strong bases, and most salts, which separate fully into their ions.
Analyze each substance given: NH_3 (ammonia) is a weak base and only partially ionizes in water, so it does not completely dissociate.
NaCl (sodium chloride) is an ionic salt that dissolves in water by fully separating into Na^+ and Cl^- ions, meaning it completely dissociates.
H_2O (water) is a molecular compound and does not dissociate into ions under normal conditions; it can autoionize slightly but not completely dissociate.
CH_3COOH (acetic acid) is a weak acid and only partially ionizes in water, so it does not completely dissociate.
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