Evaluate the effect of adding sodium hydroxide to a solution of iron(III) chloride on its solubility.

• A. Solubility increases due to the formation of a complex ion.
• B. Solubility decreases due to the formation of iron(III) hydroxide precipitate.
• C. Solubility remains unchanged as iron(III) chloride is insoluble.
• D. Solubility increases due to the common ion effect.

Answer: (B)