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Colligative Properties: A Chemistry Lab Report, Lab Reports of Chemistry

LaSalle CollegeChemistry

Lab report template for chemistry labs

Typology: Lab Reports

2021/2022

Uploaded on 05/26/2022

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Dawson College
Department of Chemistry and Chemical Technology
Laboratory Report
Experiment # 02
Experiment Title:
Colligative Properties
Lab report done by: Aaida Hossain - 2132500
Partner: Mia Alyssa Nardelli
Presented to: Stephanie Harrison
202-NYA-05, Laboratory Section 15
Date of the Experiment: 09-02-2021
Date of the Lab Report Submission: 23-02-2021
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Dawson College

Department of Chemistry and Chemical Technology

Laboratory Report

Experiment # 02 Experiment Title: Colligative Properties Lab report done by: Aaida Hossain - 2132500 Partner: Mia Alyssa Nardelli Presented to: Stephanie Harrison 202-NYA-05, Laboratory Section 15 Date of the Experiment: 09-02- Date of the Lab Report Submission: 23-02-

Results:

Graph 3: The freezing point cyclohexane Graph 4 :The freezing point of the unknown solute/cyclohexane solution

Table 1 - Part A-B: Data for Pure Cyclohexane Mass of empty test tube, stopper and beaker, g 116. Freezing temperature of cyclohexane, ˚C 6. Table 2 - Part A-B: Data for the Benzophenone/Cyclohexane Solution Mass of tube, stopper, beaker and cyclohexane, g 135. Mass of cyclohexane, g 19. Mass of tube, stopper, beaker, benzophenone and cyclohexane, g

Mass od benzophenone, g 0. Freezing Temperature of benzophenone/cyclohexane solution, ˚C

Molality of benzophenone/cyclohexane solution, mol ∙ kg − 1

Kf for cyclohexane, (^) ° C ∙ kg ∙mol−^1 22. Percentage of error, % 13.61% Table 3 - Part A-C: Data for the Pure Cyclohexane Mass of empty test tube, stopper and beaker, g 109. Freezing temperature of cyclohexane, ˚C 6. Kf for cyclohexane from part A-B, (^) ° C ∙ kg ∙mol−^1 22. Table 4 – Part A-C: Data for the Unknown Solute/ Cyclohexane Solution Unknown Number 2 Mass of tube, stopper, beaker and cyclohexane, g 128. Mass of tube, stopper, beaker and unknown solute/cyclohexane solution, g 128. Mass of cyclohexane, g 18. Mass of the unknown solute, g 0. Freezing temperature of unknown solute/ cyclohexane solution, ˚C 4. Molar mass of unknown solute, (^) g ∙ mol−^1 252.

M =

m

∆ T

Kf )

∗kg of solvent M (^) unknown solution= 0.3682 g

6.3356 ° C−4.5588 °C

22.95° C ∙ kg ∙ mol

− 1 )∗0.0188462kg

=252.4 g ∙mol − 1 Pre-laboratory questions:

  1. A colligative property is a property that depends on the concentration of solute molecules.
  2. The solute molecule blocks the solvent molecules from sticking together as easily at a given energy level or temperature, requiring a lower temperature to get enough stickiness to freeze.
  3. m=^

∆ T

K (^) f

5.12 kg ∙ °C ∙mol − 1 =1.24^ mol^ ∙^ kg − 1 n=m∗kilogram of solvent =1.24∗0.0100=0.0124 mol

  1. Ionic compounds dissolve into many particles in solutions, thus creating more blockage.
  2. Molar mass of water is 18.01528 g/mol, and molar mass of ethanol is 46.07 g/mol. Consider 1 L of solution. Then, the mass of that 1 L, from the given density, is trivially found to be 978 g. Then, let n be the moles of ethanol in that 1 L of solution, and let m be the moles of water in that same 1 L of solution. Then, the following equations hold true: n mol∗46. g mol +m mol∗18. g mol = 978 g mole fraction= n n+m

This gives us two equations and two unknowns, allowing us to solve for n and m. This gives n = 3.95 mol and m = 44.2 mol. Molality: molality ( m)= ( moles of solute ) kilogram of solvent

3.95 mol 44.2 mol∗18. g mol ∗ 1 kg 1000 g =4.96 mol / kg Molarity: Molarity= moles of solute liters of solution

3.95 mol 1 L =3.95 mol / L Percent Mass: percent mass= mass of solute mass of solution

3.95 mol∗46. g mol 978 g

References:

  1. Department of Chemistry. (2018). Chemistry of Solutions: Laboratory experiments. Dawson College. Montreal, QC.