• Join over 1.2 million students every month
  • Accelerate your learning by 29%
  • Unlimited access from just £6.99 per month

Investigation of the variation of boiling point with composition for different mixture of two miscible liquids

Extracts from this document...

Introduction

? Name: Penguin Chow Cheuk Yan ? ? Class: 6S Class Number: 14 ? ? Date: 17 - 05 - 2003 ? Chemistry Full Report Experiment 16 Title: Investigation of the variation of boiling point with composition for different mixture of two miscible liquids Aim: To study the situations of intermolecular forces between unlike molecules in a mixture of two miscible liquids. The situations may be either stronger or weaker or the same which depends on whether the solution is ideal or not. The boiling point of a liquid depends on the strength of intermolecular force. The higher the strength, the higher the boiling point. The formation of a liquid mixture involves changes in the strength of the intermolecular forces. The formation of ideal mixtures and non-ideal mixtures relates to how the intermolecular force is changed Theory: Firstly, it is important to have known the difference between ideal and non-ideal solution. Ideal solution is known as a solution formed with no accompanying energy change when the intermolecular forces between the molecules of the solvents are the same as those between the molecules in the separated components. Ethanol contains -OH group which can form hydrogen bond among its molecules. On mixing, the hydrogen bond are broken among ethanol molecules. ...read more.

Middle

6.8 The mixture was then reheated until boiling gently again. 6.9 Further additions of 3 ?3 and 5 ?3 of propanone was added into the mixture and boiling point of each mixture was recorded down in the TABLE 1. 6.10 After that, the flask was emptied out and it was kept away from any naked fire while at the same time it was allowed to dry as the mixture was volatile and flammable. 6.11 Adding in succession 2 ?3 and 3?3 and 5 ?3 of hexane was repeated and results were recorded in the TABLE 1. Apparatus: (-10 ?) - 110 ? thermometer 1 piece anti-bumping granules several pieces 10 cm3 measuring cylinders 4 pieces quickfit set 1 set Bunsen burner 1 set wire gauze 1 piece Chemicals: tichloromethane ethyl ethanoate propanone hexane Result: TABLE 1 Volume of trichloromethane / cm� 10 10 10 10 5 2 0 Volume of ethyl ethanoate / cm� 0 2 5 10 10 10 10 Volume % of ethyl ethanoate 0 16.67 33.33 50 66.67 83.33 100 Boiling point / ? 60.5 69.8 70.0 75.0 76.5 78.5 79.5 TABLE 2 Volume of hexane / cm� 10 10 10 10 5 2 0 Volume of propanone / cm� 0 2 5 10 10 10 10 Volume % of propanone 0 16.67 33.33 50 66.67 83.33 100 Boiling point / ? ...read more.

Conclusion

In such case, the molecules are held together by hydrogen bonds. On adding hexane to propanone, the hexane molecules interpose between the molecules of propanone and break the hydrogen bonds thereby reducing the intermolecular attraction between propanone molecules. This increases the tendency of the propanone molecules to escape more readily from the liquid to vapour phase. The vapour phase therefore increases and the boiling point decreases. The escape tendency of molecules in the mixture is higher than expected from the Raoult's Law. Therefore, this mixture has a positive deviation compared with ideal solution. TABLE 1 Volume of trichloromethane / cm� 10 10 10 10 5 2 0 Volume of ethyl ethanoate / cm� 0 2 5 10 10 10 10 Volume % of ethyl ethanoate 0 16.67 33.33 50 66.67 83.33 100 Mole Fraction of ethyl ethanoate 0 16.67 33.33 50 66.67 83.33 100 TABLE 2 Volume of hexane / cm� 10 10 10 10 5 2 0 Volume of propanone / cm� 0 2 5 10 10 10 10 Volume % of propanone 0 16.67 33.33 50 66.67 83.33 100 Mole Fraction of propanone 0 16.67 33.33 50 66.67 83.33 100 Reference: 1. http://hk.geocities.com/fatherofchemistry 2. SAT II Chemistry - Barron 3. Dictionary of Chemistry - Andrew Hunt ** END ** ...read more.

The above preview is unformatted text

This student written piece of work is one of many that can be found in our AS and A Level Molecules & Cells section.

Found what you're looking for?

  • Start learning 29% faster today
  • 150,000+ documents available
  • Just £6.99 a month

Not the one? Search for your essay title...
  • Join over 1.2 million students every month
  • Accelerate your learning by 29%
  • Unlimited access from just £6.99 per month

See related essaysSee related essays

Related AS and A Level Molecules & Cells essays

  1. Catalyse Investigation

    Therefore if there are double the amount of substrate molecules in a solution, double the amount of reactions will take place at once and the rate will be doubled. Because of the time taken for the reaction and dissociation of the enzyme-product complex, as the concentrations of substrate increase not

  2. prove Boyles Law

    2.62 to 1.28, v goes from 21 to 43.3 Using my extended table, I can see that pv is more or less a constant value. This shows that Boyle��s Law is true because it states that the volume of a fixed mass of gas is inversely proportional to the pressure of the gas as long as the temperature is constant.

  1. Spreadsheet report

    stock Sweets 900 498 402 �159.36 In stock T-shirts 250 156 94 �187.20 In stock Albums 900 456 444 �839.04 In stock Singles 200 109 91 �82.40 In stock Jewellery 140 78 62 �62.40 In stock Max �839.04 Week 2 Item No.

  2. Molecular modelling and computational chemistry

    This will generate Cartesian co-ordinates for all the atoms in the molecule. ViewerLite gives a better visualisation of the structures and hence, in addition one is also able to calculate bond angles and atom-atom distances. Unlike with models, the structures are not restricted to predetermined bond lengths and angles.

  • Over 160,000 pieces
    of student written work
  • Annotated by
    experienced teachers
  • Ideas and feedback to
    improve your own work