Lactic acid partially dissociates according to this following equation: CH₃CH(OH)COOH(aq) ⇌ H⁺(aq) + CH₃CH(OH)COO^–(aq). A solution is formed by dissolving 1.50 mol of lactic acid in 1.00 kg water, where 1.00% of lactic acid dissociates to ions. Calculate the freezing point of the solution, given that K_f for water is 1.86 ºC/m.

• A. –2.82 °C
• B. 0.485 °C
• C. –5.42 °C
• D. –12.7 °C

Answer: (A)