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

To study the factors which affect the rate of the methanol clock reaction.

Extracts from this document...

Introduction

Chemistry lab report 1) Experiment No.: 9 2) Objective: To study the factors which affect the rate of the methanol clock reaction. 3) Date: 17th December, 2010 4) Theory: The experiment consists of 2 parts. In both parts, the following reaction between methanol and hydrogensulphate(IV) ion occurs: HCHO + HSO3- --> CH2OHSO3- hydrogensulphate(IV) is consumed in the reaction. When its concentration drops to a certain level, the pH rises sharply, and pink color will be observed as phenolphthalein indicator was used. In part (A), different known amount of water was mixed with different known amount of methanol with a little phenolphthalein added. Then a known amount of sodium hydrogensulphate(IV) and sodium sulphate(IV) solution was added to the mixture. In part (B), a known amount of water was mixed with a known amount of methanol with a little phenolphthalein added. Then a known amount of sodium hydrogensulphate(IV) and sodium sulphate(IV) solution was added to the mixture at different temperature. ...read more.

Middle

of methanol: 0.3M Conc. of NaHSO3: 0.2M Conc. of Na2SO3 : 0.05M 8) Calculation for discussion A Part (A): 1 2 3 4 5 Concentration of methanol mol/dm3 0.075 0.1125 0.15 0.1875 0.225 In[Concentration of methanol] -2.59 -2.19 -1.90 -1.67 -1.49 [Concentration of methanol]-1 mol-1/dm-3 13.33 8.89 6.67 5.33 4.44 * Using integrated rate equations: [A] = -k t + [A]0 (1) In[A] = -k t + In[A]0 (2) [A]-1 = k t + [A]0-1 (3) Where [A] is methanol. * Using equation (1), plotting a graph of [A] against time t. If negative slope with initial conc. of [A] is shown, it is a zero order reaction. * Using equation (2), plotting a graph of In[A] against time t. If negative slope with In[initial conc. of [A]] together with positive y-intercept is shown, it is a first order reaction. * Using equation (3), plotting a graph of [A]-1 against time t. If positive slope with [initial conc. ...read more.

Conclusion

= (8.314)x(-11111) = 92.378 kJ mol-1 Activation energy of the Formaldehyde Clock Reaction is 92.378 kJ mol-1 9) Remarks: (a) In part (A), the volume of water increase when the volume of methanol decrease, and the volume of NaHSO3 and Na2SO3 was kept constant to ensure that the concentration of NaHSO3 and Na2SO3 will be the same among the five attempts as the total volume of water and methanol will still be 20cm3 It was done so because when doing experiment to determine how factors affecting the rate of a chemical reaction, only one factor can be a variable each time while others are kept constant. (b) In part (B), an increase in temperature will increase the rate of reaction because as a reaction occurs when the reactant molecules process enough energy and collide together, so when the temperature of reactants increase, the molecules will process more energy and they will also move more vigorously, thus increases the chance for molecule collision. Then the rate of reaction will be increase as a result. ~End of report~ ?? ?? ?? ?? ...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 Physical 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 Physical Chemistry essays

  1. The Determination of rate equation

    In this experiment, I am going to find out the rate of reaction between sodium thiosulphate Na2S2O3 and hydrochloric acid HCl, by varying concentrations of both solutions. Ionic equation: S2O32-(aq) + 2H+ (aq) ? SO2 (g) + S(s) + H2O (l)

  2. detremining the rate equation

    As I stated before what rate of reaction is. The rate of reaction is affected by some factors which I will be try to keep there affect minimal. These factors are: Concentration An increase in concentration will result in an increase in the rate of the reaction and the reason behind this is there will be more particles present

  1. Investigating the Rate of the Reaction between Bromide and Bromate Ions in Acid Solution

    Heat may be produced. The resulting solution should be tested for alkalinity with litmus solution and, when just alkaline, poured down a foul-water drain with further dilution. Carry out in a fume cupboard o Bromophenol, C6H5Br3OH, aqueous o Risks: See phenol; also FLAMMABLE, IRRITATING to the skin o Disposal: Dilute in water, pour down sink o Hydrated copper (II)

  2. Organic Molecule – Lysine.

    while restricting food sources of arginine. A significant number of participants (74%) noticed an improvement in their HSV infections and a decrease in the number of outbreaks. Lysine supplements may even prevent HSV outbreaks in chronic sufferers. In animals, high amounts of lysine have been linked to increased risk of gallstones and elevated cholesterol.

  1. The effect of different factors on egg white.

    Therefore any amino acid, which has in its place a carboxyl group, which is an additional one would be an acidic one and if in its place it has an additional amino group it, would be a basic. That was in summary a brief explanation of the structure of an

  2. To study the effect of dilution, concentration of water and temperature on the rate ...

    Effect of Concentration of Methanal 1. According to the table above, 0.3 M methanal and deionized water was measured using clean 10.0 cm3 measuring cylinders respectively. Volume of 0.3 M methanal (cm3) 5.0 7.5 10.0 12.5 15.0 Volume of water (cm3)

  1. Investigating how concentration affects rate of reaction

    This is shown in Figure 4 below: (2) For a reaction with order zero: Rate = k[A]0 This means, due to the fact that anything to the power of zero equals one, the equation for a zero order reaction is: Rate = k This shows that, for order zero reactions, the rate is independent of the concentration of 'A'.

  2. Individual investigation - Reaction to be studied Rate of reaction between propanone and ...

    > To make experiment accurate, we have to rinse the burette or pipette with the solution with the solution that we are going to use. > When titrating, we have to perform certain process show below: * Use accurate grading pipette into the conical flask.

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