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

The aim of my investigation is to find out the effect of temperature on the rate of reaction.

Extracts from this document...

Introduction

The Disappearing Cross Background Information Sodium thiosulphate Na2S2O3 reacts with hydrochloric acid HCl as follows. Word equation Sodium + Hydrochloric -> sodium chloride + Thiosulphate acid sulphur + sulphur Dioxide + water Balanced Equation Na2S2O3 + 2HCl(aq) -> 2NaCl(aq) + S(s) + SO2(g) + H2O(l) When the reactants are mixed together the solution becomes cloudy because sulphur is precipitate. As the precipitate gets thicker, ink cross of a piece of paper below the flask disappears. The aim of this investigation is to study in detail the effect of a variable on the rates of reactions. Aims The aim of my investigation is to find out the effect of temperature on the rate of reaction. Prediction I predict that as temperature increases the rate of reaction will also increase. ...read more.

Middle

The yellow is a collision between a blue and red molecule. This is a diagram to show Collisions at 60�c. Equipment list 2m-hydrochloric acids, 0.05m sodium thiosulphate, Water bath, (electrical) Conical flask x1 250cm3, Thermometer, Piece of paper with an X on it, Stopwatch, 20cm3 measuring cylinder, Safety goggles, Diagram Stopwatch <-- Conical flask <-- Solution containing -> 5cm3 hydrochloric acid Paper with x on it and 50 cm3 sodium thiosuphate Safety > Hydrochloric acid is corrosive; all spills must be reported and cleaned up immediately. > Sodium thiosuphate (L) is contained in a dark glass bottle to prevent light breaking the bonds. > Safety goggles must be worn at all times. > Must be careful with hot water bath. Preliminary work This experiment was first of all carried out and demonstrated by our teacher during a lesson one morning. ...read more.

Conclusion

Place the conical flask on the cross and immediately start the stopwatch. 6. Record the time it takes for the cross to disappear on the results table. 7. Repeat steps 1-7 for each temperature, three times so that an average can be taken. Fair testing In order to make this experiment a fair test, the following dependant variables will be kept constant: - ==> Same volumes of liquids will be used each time. ==> The same concentrations of both the sodium thiosulphate and hydrochloric acid for the duration of the experiment. ==> The same concentrations of both the sodium thiosulphate and hydrochloric acid for the duration of the experiment. The independent variable is temperature. ==> Repeat the experiment 3 times to improve accuracy and validity my results. ==> Clean equipment with water between each trial. ==> Will carry out preliminary work to ensure that the practical works and that the concentrations selected are appropriate for the activity. ...read more.

The above preview is unformatted text

This student written piece of work is one of many that can be found in our GCSE Patterns of Behaviour 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 GCSE Patterns of Behaviour essays

  1. Determine the effect temperature has on the rate of reaction.

    This involves looking at continuous and discontinuous reactions to measure rate of reaction. There are three ways of obtaining a rate value from a concentration against time graph plot, however these ways are indirect. These indirect ways involve discontinuous and continuous experiments to find orders.

  2. Catalase activity in the liver

    I will also be taking the temperature straight away so the stock solution doesn't lose any heat (because in some parts of the experiment it will make the rate of reaction slow down). I performed an all or nothing experiment this proves that the enzymes are the reason for the reaction therefore we know why we are getting the results.

  1. An investigation into the effect of concentration on the rate of reaction. The disappearing ...

    I predict that the graph will look like the one from my preliminary work - this is on a separate sheet. Fair Test In order to receive some reliable and accurate results I will have to make sure I conduct a reasonably fair test.

  2. The aim of the investigation is to examine the kinetics involved in the reactions ...

    This will change the amount of the concentration of reactants, which will increase the rate in which products are produced for them to be used in the fast step, increasing the rate of the whole mechanism. A proposed mechanism for the reaction is shown in the sequence below: (Rate determining step)

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