Which solute particles are present in an aqueous solution of CH3COCH3 (acetone)?

• A. Only CH3COCH3 molecules
• B. CH3COCH3 molecules and CH3COCH3 ions
• C. CH3COCH3 molecules and CH3COO- ions
• D. CH3COCH3 molecules and H+ ions

Answer: (A)

Verified step by step guidance

1. Identify the nature of acetone (CH3COCH3) in water: Acetone is a molecular compound, specifically a ketone, and does not ionize significantly in aqueous solution.
2. Recall that ionic compounds dissociate into ions in water, but molecular compounds like acetone typically dissolve as intact molecules without forming ions.
3. Consider the possible ions listed: CH3COCH3 ions, CH3COO- ions, and H+ ions. Acetone does not have acidic protons to release H+ ions, nor does it form CH3COCH3 ions or acetate ions (CH3COO-) upon dissolution.
4. Therefore, in an aqueous solution of acetone, the solute particles present are primarily the intact CH3COCH3 molecules.
5. Conclude that the correct description of solute particles in acetone solution is 'Only CH3COCH3 molecules'.