Question

Which of the following aqueous solution should have the highest boiling point?

• A. $1.0MNaOH$
• B. $1.0MNa_{2}SO_{4}$
• C. $1.0MNH_{4}NO_{3}$
• D. $1.0MKNO_{3}$

Answer 1

Answer: (B)

$1.0MNa_{2}SO_{4}$

Answer 2

$\Delta T_{b} = iK_{b}m$

$T_{b} - T_{b}^{0} = iK_{b}m$

Thus, boiling point of solution $(T_{b})$ depends on value of van’Hoff factor (i).

For $1.0$M $Na_{2}SO_{4}$solution i = 3 hence, it has highest boiling point.