Question

In: Chemistry

Which aqueous solution will have the lowest freezing point? (Hint: Relate to colligative properties.) 0.140 molal...

Which aqueous solution will have the lowest freezing point? (Hint: Relate to colligative properties.)

0.140 molal MgCl2

0.75 molal LiCl

0.150 molal KBr(aq)

0.100 molal NaBr(aq)

Solutions

Expert Solution

MgCl2 is a strong electrolyte.

Number of particles due to MgCl2 in aqueous solution = 3   (1 Mg2+ and 2 Cl-)

Therefore, the effective molality of the aqueous solution of 0.140 molal MgCl2 =0.140 m x 3 = 0.420 m

LiCl is a strong electrolyte.

Number of particles due to LiCl in aqueous solution = 2 (1 Li+ and 1 Cl-)

Therefore, the effective molality of the aqueous solution of 0.75 molal LiCl =0.75 m x 2 = 1.50 m

KBr is a strong electrolyte.

Number of particles due to KBr in aqueous solution = 2 (1 K+ and 1 Br-)

Therefore, the effective molality of the aqueous solution of 0.150 molal KBr = 0.150 m x 2 = 0.300 m

NaBr is a strong electrolyte.

Number of particles due to NaBr in aqueous solution = 2 (1 Na+ and 1 Br-)

Therefore, the effective molality of the aqueous solution of 0.100 molal NaBr = 0.100 m x 2 = 0.200 m

Now, the freezing point depression of the aqueous solution is proportional to the effective molality of the solution.

Hence, the aqueous solution that will have the lowest freezing point = 0.75 molal LiCl


Related Solutions

Which of the following four aqueous solutions will have the lowest freezing point? i) 0.05 m...
Which of the following four aqueous solutions will have the lowest freezing point? i) 0.05 m sucrose ii) 0.05 m CaCl2 iii) 0.05 m NaCl iv) 0.05 m AlCl3 MgCl2 is widely used to prevent ice formation on roadways. If this solution has non-ideal behavior, the van’t Hoff factor for a 0.05 m aqueous solution of MgCl2 would reasonably be _____. a. 1 b. 2 c. 2.7 d. 3 e. 3.2 Assuming ideal behavior, the change in the freezing point...
Part A - Calculation of Boiling-Point Elevation and Freezing-Point Depression Which aqueous solution will have the...
Part A - Calculation of Boiling-Point Elevation and Freezing-Point Depression Which aqueous solution will have the lowest freezing point? Which aqueous solution will have the lowest freezing point? a) 0.10 m HCl b) 0.15 m NaCl c) 0.050 m CaCl2 d) 0.20 m C12H22O11 e) 0.050 m CH3COOH
how vapor pressure and boiling point relate to colligative properties
how vapor pressure and boiling point relate to colligative properties
The freezing point is propertie of colligative characterized by lowering of the freezing point of a...
The freezing point is propertie of colligative characterized by lowering of the freezing point of a liquid in the presence of a non-volatile solute. The cryoscopic lowering a, Δ t, is expressed by: ΔT = kcM where KC is the cryoscopic constant and M is the total molality of the solution species. Consider aqueous solutions and concentrations 5,0x10-3 mol.kg -1 with fully dissociated solutes: potassium nitrate (KNO3), calcium chloride (CaCl2), cadmium nitrate ((Cd (NO3) 2), ferric chloride ( FeCl 3)...
Assuming complete disassociation of electrolytes which of these aqueous solutions has the LOWEST freezing point (reminder...
Assuming complete disassociation of electrolytes which of these aqueous solutions has the LOWEST freezing point (reminder 1 molal=1 mol kg-1) 0.15 molal KCl 0.20 molal methanol 0.40 molal methanol 0.10 molal K2O 0.10 molal KCln
Determine the colligative (effective) molality of a truly saturated salt solution and the freezing point of...
Determine the colligative (effective) molality of a truly saturated salt solution and the freezing point of a truly saturated salt solution (solubility limit of NaCl is 35.7 g)
The boiling point of an aqueous solution is 102.34 °C. What is the freezing point?
The boiling point of an aqueous solution is 102.34 °C. What is the freezing point?
The boiling point of an aqueous solution is 101.42 °C. What is the freezing point?
The boiling point of an aqueous solution is 101.42 °C. What is the freezing point?
The boiling point of an aqueous solution is 102.32 °C. What is the freezing point? Constants...
The boiling point of an aqueous solution is 102.32 °C. What is the freezing point? Constants can be found here.
1) The boiling point of an aqueous solution is 101.98 ∘C. What is the freezing point?...
1) The boiling point of an aqueous solution is 101.98 ∘C. What is the freezing point? Consult the table of colligative constants. freezing point:   °C 2) Quinine is a natural product extracted from the bark of the cinchona tree, which is native to South America. Quinine is used as an antimalarial agent. When 0.829 g of quinine is dissolved in 25.0 g of cyclohexane, the freezing point of the solution is lowered by 2.13 ∘C. Look up the freezing point...
ADVERTISEMENT
ADVERTISEMENT
ADVERTISEMENT