Question

From the following list of aqueous solutions and water, select the one with the highest boiling point.

1.0 M KNO3

pure water

2.0 M C12H22O11 (sucrose)

0.75 M CuCl2

0.75 M NaCl

Answer 1

Answer on Question 78229 in General Chemistry

The highest boiling points will have 0.75 M solution of CuCl₂ because it's strong electrolyte which is completely dissociated in aqueous solution according the equation

$$\mathrm{CuCl_2} = \mathrm{Cu^{2+}} + 2\mathrm{Cl^-}$$

The general concentration of ions is $3 \times 0.75 = 2.25\ \mathrm{M}$