Glucose solution, freezing temperature

Problem Water freezes in normal conditions at exactly 0°C. Dissolved substances lower the freezing temperature of the solution based on the concentration of the solvent 1-molar glucose solution freezes at — 1.9°C, 2-molar glucose solution freezes at —3.8°C. One can state that the higher the concentration of a solution, the lower the freezing temperature. This fact can be used as an experimental introduction to the concept of ions. A one molar table salt solution does not deliver the expected value of— 1.9° C, but rather doubles the value of approximately —3.8°C. The analysis shows, that 11 of 1-molar NaCl solution contains 2 mol particles lmol sodium ions and lmol chloride ions. One can state that 1-molar sodium chloride solution is 2 molar with respect to the total number of ions. 

Lemon juice is a complex solution that does not freeze in a home freezer at temperatures as low as — 11°C. At what temperature will the lemon juice freeze if its effective molahty is the equivalent of a 10.48 m glucose solution ... 

Problem 3 A solution is prepared by dissolving 35.0 g of glucose, C6H1206, in 650 g (0.650 kg) of water. At what temperature will this solution freeze Kf for water is 1.86°C/m. The molar mass of glucose is 180.2 g. 

CAN YOU ANSWER THIS The wood frog can survive at body temperatures as low as —8.0 °C. Calculate the molality of a glucose solution (CstiijO required to lower the freezing point of water to —8.0 °C. 

Fig. 18.11. Freezing temperature of apple juice and glucose solution as affected by soluble dry matter (DM) (according to Schobinger, 1978)...

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