It is common to plot a calibration curve for a colorimeter by making up solutions of the coloured substance of known concentration and then measuring the absorbance of each under the same conditions as you will do the experiment. Some sample reactions The catalytic decomposition of hydrogen peroxide This is a simple example of measuring the initial rate of a reaction producing a gas. To do this, you have to be happy with calculations involving the ideal gas law, and also basic mole calculations. So, in this experiment we have chosen to keep hydrochloric acid at a constant concentration 5cm3. If you added some starch solution to the reaction above, as soon as the first trace of iodine was formed, the solution would turn blue.

The maths of this might not be familiar to you, but you may find that you are asked to do this as a part of a practical exam or practical exercise. We must produce a piece of coursework investigating the rates of reaction, and the effect different changes have on them. This increases the concentration and thus the rate of reaction. I have learnt that an enzyme is a natural catalyst, something that speeds up the experiment without altering the out come. An example of how an enzyme molecule might join two other molecules together and form a more complicated substance is shown below. Consequently the rate of collision increases. Time how long it takes for the cross to disappear.

This can be justified by relating to the collision theory. I believe that when the most concentrated solution is used the reaction would be at its fastest. The reaction is represented by the following equation: You don’t need to read about the origin of the colour for now.

If more particles are present in the same volume, they will be closer together. The iodine is formed first as a pale yellow solution darkening to orange and then dark red, before dark grey solid iodine is precipitated. The rate of reaction is the rate of reaction between sodium thiosulphate and hydrochloric acid coursework of loss of a reactant or the rate of formation of a product during a chemical reaction. Breaking the solid into smaller pieces will increase the surface area exposed to the other reactant Prediction I think that the reaction will be fastest at 50 degrees centigrade ,because at body temperature reactions are carried out quickly but at a higher temperaturem the enzyme and sugar particles will move faster due to a larger amount But if possible and it is possible in the case we are talking about it is better to stop the reaction completely before you do the titration.


The problem is that you are measuring the volume of product, whereas to find an order of reaction you have to be working in terms of the concentration of the reactants – in this case, hydrogen peroxide.

Reaction Rate Investigation – Reaction Rate Investigation Planning I am trying to work out the rate of reaction between marble chips calcium carbonate and Hydrochloric acid. This increases the probability of reactant particles colliding with each other. So the practical side of this experiment is straightforward, but the calculation isn’t.

What Affects the Rate of Reaction – What Affects the Rate of Reaction In this investigation I am trying to find out how to change the rate of reaction between sodium thiosulphate and hydrochloric acid.

The rate law is an expression deduced to show the relation of rate to the concentrations of the reactants in a chemical reaction. My own experiences of rate of reaction would probably be a rusting iron ,a bomb going off, the firing of a bullet and charging the battery of a mobile phone. Background information The collision theory briefly: Quantity of Enzymes and the Rate of Reaction with the Substrate – Is there a relationship rate of reaction between sodium thiosulphate and hydrochloric acid coursework the quantity of enzymes and the rate of reaction with the substrate.

Various tangents could be found on the graph and then we can calculate and plot the rate against concentration graph to find the order. Then you find the time taken for the same event to take place with that new concentration. Only particles with enough energy to overcome the barrier will react after colliding. Taking copper II sulphate solution as a familiar example, you would choose to use a red filter, because copper II sulphate rate of reaction between sodium thiosulphate and hydrochloric acid coursework absorbs red light.

Rate of Reaction – Sodium Thiosulphate and Hydrochloric Acid

Using the full strength solution hot will produce enough precipitate to hide the cross almost instantly. Enzymes either break molecules down or build them up. The second part of the experiment will be keeping the thiosulphate and total volume constant and changing the HCl and water volumes When the concentration was 50 M the average time was 0.

Chemical reactions rely on molecules colliding with each other. If we double the concentration, the rate will also double I think that the lower the concentration of Hydrochloric acid, the slower the rate of reaction with Magnesium ribbon. We must produce a piece of coursework investigating the rates of reaction, and the effect different changes have on them.


Cooling it as well as diluting it will slow it down even more. Reaction Rates Energy Science Essays].

A reaction between Hydrochloric Acid and Magnesium ribbon.

This will be my plan of how to carry out my investigation. That’s most effective if you are doing your reaction at a temperature above room temperature. Firstly the experiment will be done with the volume of HCl and total volume constant, and changing the Thiosulphate and water volumes, thereby changing the concentration of the thiosulphate.

Concentration of the acid Time taken for the cross to disappear Temperature Concentration of Sodium thiosulphate The reaction will not take place unless the particles will collide with each other In this experiment I will be testing the rate of reaction of Hydrochloric acid and Sodium Thiosulphate.

Disappearing cross (aka Rate of reaction). – GCSE Science – Marked by 01

The rate of reaction is found by measuring the amount of a reactant used up per unit of time or the amount of a product produced per unit of time. They speed up the chemical reactions by lowering the energy of activation barrier, are specific to one molecule.

The blue colours appear in exactly the order you would predict.

This would have brought more evidence to support the idea that the higher concentration of a substance, the faster it will react. To detect when cross disappears and stopping clock at that sudden instance was very hard to judge effectively. During the course of the reaction, as hydrogen ions and iodide ions get used up, the conductivity of the mixture will fall. Effect of Temperature on Rate of Reaction of Catalase – Effect of Temperature on Rate of Reaction of Catalase Rate of reaction between sodium thiosulphate and hydrochloric acid coursework This investigation was in an attempt to try to find out how varying the temperature can affect an enzyme.

order of reaction experiments

If it is an exam, you would probably be given help as to how to go about it. The aim of this experiment is to find out if the reaction rate of sodium thiosulphate solution and hydrochloric acid will be affected by a temperature change.

The concentrations of the bromoethane are, of course, the same as these if you started with the same concentrations of each reagent.