What is the formula for the elevation in boiling point Delta T_b of a dilute solution containing a non-volatile solute?
Answer and explanation
Correct answer: D. Delta T_b = i K_b m
- Step 1: Non-volatile solutes lower vapor pressure, requiring higher temperature for vapor pressure to reach atmospheric pressure. Step 2. Boiling point elevation is proportional to molal concentration: Delta T_b = i K_b m, where K_b is molal boiling point elevation constant. Answer: Delta T_b = i K_b m. Why not the others: Division by m inverts concentration; division by K_b inverts constant; m^2 is non-linear.
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