Docsity
Docsity
Prepare for your exams
Prepare for your exams

Study with the several resources on Docsity

Earn points to download
Earn points to download

Earn points by helping other students or get them with a premium plan

Guidelines and tips
Guidelines and tips
Sell on Docsity
Sell on Docsity
Docsity AI
Docsity AI
Log inSign up

Prepare for your exams

Study with the several resources on Docsity

Find documents

Prepare for your exams with the study notes shared by other students like you on Docsity

Search for your university

Find the specific documents for your university's exams

Docsity AINEW

Summarize your documents, ask them questions, convert them into quizzes and concept maps

Explore questions

Clear up your doubts by reading the answers to questions asked by your fellow students

Earn points to download

Earn points by helping other students or get them with a premium plan

Share documents
download point icon20 Points

For each uploaded document

Answer questions
download point icon5 Points

For each given answer (max 1 per day)

All the ways to get free points
Get points immediately

Choose a premium plan with all the points you need

Study Opportunities

Choose your next study program

Get in touch with the best universities in the world. Search through thousands of universities and official partners

Community

Ask the community

Ask the community for help and clear up your study doubts

Free resources

Our save-the-student-ebooks!

Download our free guides on studying techniques, anxiety management strategies, and thesis advice from Docsity tutors

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

aaida-hossain
aaida-hossain 🇨🇦

5

(3)

2 documents

1 / 8

Toggle sidebar

This page cannot be seen from the preview

Don't miss anything!

bg1
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
pf3
pf4
pf5
pf8

Partial preview of the text

Download Colligative Properties: A Chemistry Lab Report and more Lab Reports Chemistry in PDF only on Docsity!

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.