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

Equilibrium Constant for esterification

Extracts from this document...


Chemistry Experiment 15 (a) Title: Equilibrium Constant for esterification (b) Aim: To find out the equilibrium constant for esterification of ethanoic acid and propan-1-ol. (c) Theory: In the presence of conc. H2SO4 and under reflux, ethanoic acid undergoes a reversible reaction with propan-1-ol to form ester and water. As equilibrium is reached, CH3COOH(l)+CH3CH2CH2OH(l) CH3COOCH2CH2CH3(l)+H2O(l) Kc = By titrating the reaction mixture with standard alkali solution before and after refluxing, the quantity of the acid used, and thus the quantities of the alcohol used as well as of the ester and water formed can be determined. Knowing the quantities or molar concentrations of the species present in the equilibrium mixture, the equilibrium constant, Kc can be calculated. Set-up: (d) Result: Titration of 8 drops of H2SO4 against NaOH Titration 1 (trial) 2 Final burette reading (cm3) 15.1 30.2 Initial burette reading (cm3) 0 15.1 Volume of NaOH used (cm3) ...read more.


of moles of CH3COOH reacted in 1 cm3 of mixture = 8.75 x 10-3 mol - 3.65 x 10-3 = 5.10 x 10-3 mol No. of moles of CH3CH2CH2OH in 1 cm3 of reaction mixture after heating = No. of moles of H+ from 1 cm3 of CH3COOH = 3.65 x 10-3 mol No. of moles of CH3COOCH2CH2CH3 in 1 cm3 of reaction mixture after heating = No. of moles of H+ reacted in 1 cm3 of CH3COOH = 5.10 x 10-3 mol No. of moles of H2O in 1 cm3 of reaction mixture after heating = No. of moles of CH3COOCH2CH2CH3 = 5.10 x 10-3 mol Therefore, Kc = (5.10 x 10-3 x 5.10 x 10-3) (3.65 x 10-3 x 3.65 x 10-3) = 1.95 When comparing with the theoretical value (Kc=3.00), Percentage error = [(1.95 - 3.00) / 3.00] x 100% = - 35% (e) ...read more.


3. If the NaOH needed for the end-point of titration is constant, it indicates that the concentration of the reacting substances do not have further changes, meaning that the esterification process has completed and reached an equilibrium. 4. (i) The number of moles of NaOH required for complete neutralization with H2SO4 and also the CH3COOH in the reaction mixture will not be accurate, causing errors when estimating the number of moles of the 8 drops of the added H2SO4 and also that of the CH3COOH reacted. Hence, the equilibrium constant obtained will be inaccurate. (ii) Since the actual volume of the reaction mixture was lower than the expected one, the concentration of the former would be higher than the latter. Since the volume after mixing the reactants is used to determine the concentration of the 4 reactants, the equilibrium constant obtained will be inaccurate. (g) Conclusion: The equilibrium constant (Kc) for the reaction CH3COOH(l)+CH3CH2CH2OH(l) CH3COOCH2CH2CH3(l)+H2O(l) is 1.95, with an percentage error of -35% ?? ?? ...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 Organic 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 AS and A Level Organic Chemistry essays

  1. The aim of this experiment is to produce Aspirin. This is an estrification in ...

    Standard solutions can be chemically reacted with a solution of unknown concentration in order to determine the concentration of the unknown The acetylsalicylic acid and NaOH react in a 1:1 ratio. The NaOH solution was made to a concentration of 500cm3 0.1 mol dm-3.

  2. investigating the amount of ascorbic acid present in fruit

    Use distilled water to take out the juice left on the pestle and mortar on the beaker (100ml). 5. It is likely that there will be solid bits remaining in the liquid, so this will then have to be centrifuged.

  1. Comprehensive and Detailed Chemistry notes

    sulfuric acid drives reaction towards product side * describe the addition of water to ethylene resulting in the production of ethanol and identify the need for a catalyst in this process and the catalyst used INDIRECT HYDRATION: -- Ethylene is reacted with 98% sulfuric acid -- The reaction mixture is

  2. Compare the enthalpy changes of combustion of different alcohols

    Highly Flammable, Toxic Propan-1-ol- Highly flammable and harmful Butan-1-ol- Highly flammable and harmful Pentan-1-ol- Highly flammable and harmful These are the 5 alcohols that I will be choosing out of the six. When carrying out the experiment I will wear goggles to avoid any alcohol or hot water getting into my eyes.

  1. Aim: To determine how the concentration of each species in a reaction affects the ...

    Below are the graphs which differentiate between the three orders of reaction: Zero Order First Order Second Order 2) Using rate equation For the following reaction: Rate = k[HCl]a[Na2S2O3]b where k = reaction rate constant a = order of reaction of HCl b = order of reaction of Na2S2O3 Once

  2. Esterfication. he purpose of this lab is to achieve a specific odour through ...

    The alcohol family is polar but less in comparison to the carboxylic acid family since there is a smaller electronegativity difference. As a result, alcohols will have a lower melting point and boiling point in comparison to acids since the intermolecular forces or the hydrogen bonds are not as strong

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