T 14.1 secon Date Data Analysis and Calculations PARTS B AND C Measuring the Fre

Question

T 14.1 secon Date Data Analysis and Calculations PARTS B AND C Measuring the Freezing Points of Water and Aqueous Solutions TABLE 14.2 Laboratory Data for Determining Freezing Point of Water and Three Different Solutions Mass of Deionized Water Mass of Solute Freezing Point Test Tube Solute None Naci Unknown A ol y 2395 3, 9975 3.5 1.7 373 Unknown B 2357 Use the following steps to determine the molar mass of the solutes in Test Tubes 2, 3, and 4. Record the results of your calculations in Table 14.3. Include sample calculations for Test Tube 2 and Test Tube 3. 1 Calculate the freezing point depression for each solution relative to pure water using Equation 2. Record your results in Table 14.5 in addition to Table 14.3. a Sample Calculation for Test Tube 2: Sample Calculation for Test Tube 3: bke Equion frmoliy Show your work in he space provided

Explanation / Answer

T = iKfm
Tf = kfmc = ikfm
where
T = Change in temperature in °C
i = van 't Hoff factor
Kf = molal freezing point depression constant or cryoscopic constant in °C kg/mol
m = molality of the solute in mol solute/kg solvent.

so m =Tf /ikfm

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