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

Design: Investigating the boiling point different alcohols

Extracts from this document...

Introduction

DESIGN * Research question: * Does the molecular mass of different alcohols affect their boiling points? * Variables: * Independent variable: The molecular mass (g mol-1). * Dependent variable: The boiling points (oC). * Controlled variables: * The volume of alcohol in the test tube. * The position of the thermometer. * The same type of test tube for the entire experiment. * The absence of unnecessary substances or ions. * Prediction: * All the alcohols tested contain hydroxyl group, which has the hydrogen bonding between oxygen atom and hydrogen atom, therefore these alcohols have a relatively high boiling points for liquids. * My prediction is, the higher the molecular mass of the alcohol is, and the higher the boiling point is. The boiling point will therefore increase in this order: Methanol, Ethanol, Propan-1-ol, Butan-1-ol, Octan-1-ol. * Method: * Apparatus: * 20 ml methanol CH3OH 99.5%. * 20 ml ethanol C2H5OH 95.0%. ...read more.

Middle

* Procedures: 1. Close the tap and run some distilled water into the top of the burette, then swish the burette up and down to let the water clean all the inside of the burette. Open the tap, let the water drain out. 2. Close the tap and use the funnel to put methanol into the burette. 3. Put the test tube under the burette and open the tap to let 20 ml of methanol drain into the test tube, and use a marker pen to label methanol to distinguish among different alcohols. 4. Use another retort stand with clamp and boss attached to clamp the test tube containing 20 ml of methanol. 5. Place the tripod below the test tube. 6. Use another clamp and boss to clamp the thermometer, make sure the bulb submerged in alcohol to measure and record the initial temperature. 7. Place the Bunsen burner above heat resistant mat, right under the tripod. 8. Immediately record the temperature when the alcohol boils. 9. ...read more.

Conclusion

This is because when the bulb touches the bottom of the test tube, the temperature read will be different. * The same type of test tube will be used to prevent differences in surface area. This is due to the fact that larger surface area A (m2) will result higher heat input or output ?Q (J) in the coefficient heat transfer, stated by Wikimedia Foundation: where ?Q = heat input or heat lost, J h = heat transfer coefficient, W/(m2K) A = heat transfer surface area, m2 ?T = difference in temperature between the solid surface and surrounding fluid area, K ?t = time period, s. * The burettes and funnels are rinsed carefully with distilled water prior to the experiment to ensure that inside the burettes do not contain any unnecessary substances/ions. If present, they may react with the alcohols to form products which affect the purity of alcohols. ?? ?? ?? ?? Ken Chemistry Higher level IA Investigating the boiling point different alcohols -1- ...read more.

The above preview is unformatted text

This student written piece of work is one of many that can be found in our International Baccalaureate Chemistry 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 International Baccalaureate Chemistry essays

  1. Melting and Freezing point of naphthalene

    Light the Bunsen burner to heat the water. 5) Record the temperature of the Naphthalene every 30s. Remove the heat source (Bunsen burner) if the water boils. Add heat when boiling stops. 6) Turn off the Bunsen burner when the naphthalene has completed melted.

  2. Chemistry IA design format

    However the second change is that hydrogen breaks off from chlorine in the hydrochloric acid and hydrogen is released as a gas. The breaking of bonds would absorb energy therefore forming an exothermic reaction. Hydrogen and chorine however form a very strong covalent bond.

  1. Enthalpy of Combustion of Alcohols Lab

    three alcohols underwent combustion for 1 minute 30 seconds QUALITATIVE DATA: Methanol Ethanol Butan-1-ol 1. Yellow/Orange flame 2. The methanol lamp was warmer when we reweighed it. 1. Yellow flame 2. The water beaker turned black/gray at the bottom due to combustion 3.

  2. IB chemistry revision notes

    M X, Y or Z * Likely to be on the left side of the P.T * Likely to be metal * Likely to have a low electronegativity * Small First Ionization Energy (small 2nd , 3rd also) * Forms cations isoelectronic to a noble gas * Good Reducing Agent

  1. Change of Potential Difference in Voltaic Cells Lab Report

    Example: preparation of 0.8 M of copper sulfate Using the formula: C1V1 = C2V2 C1 is: 1 M; which is the initial concentration that we have already prepared, V1 is the unknown, C2 is the 1concentration that we want to have by the end of this dilution which is 0.8

  2. Analysis of the Standard Enthalpy of Combustion for Alcohols

    Calculating the standard enthalpy of combustion for alcohol (worked example: Methanol) 1. Calculating the moles of alcohol in combustion CH 3OH (l)

  1. The aim of this experiment is to examine the enthalpy of combustion of the ...

    = 52K Knowing this , we can calculate the total amount of energy that has been transformed to water : Q = 40.0 g * 4.20 J g-1 K-1 * 52 K Q = 8736J = 8.73 kJ Mass of Methanol used in experiment : m (CH3OH)

  2. The chemistry of atmospheric and water pollution.

    MEASURING TDS: A sample of water is filtered leaving behind suspended solids as the residue and the total dissolved solids pass through filter paper with the water. Then solution is evaporated to dryness and the solid left behind is the dissolved solid.

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