Which of the following solutes would be best depicted as dissociating completely into ions when dissolved in water?

• A. CH3COOH (acetic acid)
• B. NaCl
• C. C6H12O6 (glucose)
• D. NH3 (ammonia)

Answer: (B)

Verified step by step guidance

1. Understand that solutes which dissociate completely into ions in water are typically strong electrolytes, such as ionic compounds that are highly soluble in water.
2. Recognize that NaCl is an ionic compound composed of Na⁺ and Cl⁻ ions, which dissociates completely in aqueous solution.
3. Note that CH3COOH (acetic acid) is a weak acid and only partially ionizes in water, so it does not dissociate completely.
4. Understand that C6H12O6 (glucose) is a molecular compound and does not ionize; it dissolves as whole molecules.
5. Recognize that NH3 (ammonia) is a weak base and only partially reacts with water to form ions, so it also does not dissociate completely.