Compared to a 1.0 M NaCl(aq) solution at 1.0 atm, a 2.0 M NaCl(aq) solution at 1.0 atm has

NY Regents Chemistry Exam June 2022

14 Compared to a 1.0 M NaCl(aq) solution at 1.0 atm, a 2.0 M NaCl(aq) solution at 1.0 atm has

(1) a lower boiling point and a lower freezing point

(2) a lower boiling point and a higher freezing point

(3) a higher boiling point and a lower freezing point

(4) a higher boiling point and a higher freezing point

Explanation: When a solute is dissolved in pure solvent, like NaCl in water, it causes the boiling point to increase and the freezing point to decrease. Since 2.0 M NaCl(aq) solution has more NaCl dissolved than 1.0 M NaCl(aq) solution , it should have a higher boiling point and a lower freezing point.

Answer: 3