Why is alcohol used to dilute phenol?

Why is alcohol used to dilute phenol?

• A. Phenol is soluble in water but not alcohol
• B. Phenol is insoluble in water and alcohol
• C. Alcohol makes it stronger
• D. Phenol is insoluble in water, but is soluble in alcohol

Answer: (D)

Phenol’s behavior in solvents comes down to its molecular structure: a nonpolar aromatic ring with a polar OH group. This makes it not readily soluble in water, but it does dissolve in alcohol. Using alcohol to dilute phenol takes advantage of that solubility pattern, allowing phenol to disperse evenly and reach a precise, lower concentration. That uniform dilution is important for safe handling and predictable antiseptic strength. If you tried to dilute phenol with water, you wouldn’t get as complete a dissolution, leading to uneven concentration. Alcohol doesn’t make the solution stronger; it enables dilution. So the idea that phenol is insoluble in water but soluble in alcohol best explains why alcohol is used for dilution.

Phenol’s behavior in solvents comes down to its molecular structure: a nonpolar aromatic ring with a polar OH group. This makes it not readily soluble in water, but it does dissolve in alcohol. Using alcohol to dilute phenol takes advantage of that solubility pattern, allowing phenol to disperse evenly and reach a precise, lower concentration. That uniform dilution is important for safe handling and predictable antiseptic strength.

If you tried to dilute phenol with water, you wouldn’t get as complete a dissolution, leading to uneven concentration. Alcohol doesn’t make the solution stronger; it enables dilution. So the idea that phenol is insoluble in water but soluble in alcohol best explains why alcohol is used for dilution.