If more collisions occur, then the chance of a successful collision is higher. [IMAGE] Aim To investigate the rate of reaction between hydrochloric acid and sodium thiosulphate using variables. Equipment Sodium Thiosulphates Hydrochloric Acid Title marked with a cross - Then we will know when the reaction has taken place. Measuring cylinder - Measure how much of solution you use each time, so it's a fair test. Beaker - Where the reaction will take place Bunsen burner - How the temperature can increase.
Investigate how the change in concentration affects the rate of reaction between sodium thiosulphate and hydrochloric acid Introduction I am trying to find out how the change in concentration affects the rate of reaction between sodium thiosulphate and hydrochloric acid. I predict that the higher the concentration of sodium of thiosulphate, the quicker the rate of reaction will be between the two substances. The scientific reason for my prediction is due to the collision theory. The collision theory is, that in order for chemicals to react they must come into contact with each other (collide). However, not all collisions result in chemical reactions as sometimes the particles just bounce off each other.
When the reaction has started the molecules will react when they collide therefore break old bonds and make new bonds, this will releases energy. If activation energy is weaker or equal to produced energy reaction will take place. We will heat up sodium thiosulphate to a certain temperature. The bigger the temperature of the sodium thiosulphate the more particles will move and are likely to collide more frequently, this will speed up the reaction. The factor I chose to investigate is time taken for the cross to disappear.
The rate of the reaction can be affected by a number of things: Concentration Surface area Temperature Catalysts The collision theory The greater the surface area, the faster the rate of reaction. This is because more atoms are exposed and ready to react. The higher the temperature, the faster the rate of reaction. This is because raising the temperature makes the particles collide more often in a certain time and it makes it more likely that collisions will result in a reaction. Catalysts speed up chemical reactions therefore increase the rate of reaction.
Changing the concentration, will change the rate of reaction, this is because the higher the concentration the more particles of Sodium Thiosulpate there are to collide and react with water. More collisions mean a faster reaction. Water Hydrogen Chloride Sodium Thiosulpate [IMAGE][IMAGE] . . .
*The effect of using a catalyst on the rate of reaction is that it will speed up the rate of reaction. Using a catalyst lowers the activation energy for the reaction. More collisions have sufficient energy for reactions to take place. A catalyst that slows down a rate of reaction is called an inhibitor. *The effect of concentration on the rate of reaction is that, if the concentration is increased, there are more particles within a given volume, therefore more collisions occur and the reaction is faster.
I am going to be changing the concentration of this. · The concentration of the Hydrochloric acid - this is the proportion of hydrochloric acid in the solution. · The volume of acid - this is the amount of acid used to react with the sodium thiosulphate. · Temperature - adds energy to the reaction and can therefore speed up the reaction · The cross - has to be the same amount to be a fair test, if the cross was not the same size each time then the results could be different · Residue after each experiment - if the residue builds up it could block visibility on the next experiment. Prediction I predict that the higher the concentration the faster the reaction will take place this is because in a higher concentration there will more hydrochloric acid molecules per set volume.
Introduction: In this experiment I will vary the concentration of sodium thiosulphate to measure the rates of reaction. I will be mixing different concentrations of sodium thiosulphate with hydrochloric acid, the collision theory says the reaction time will alter; this is what I will be testing. The collision theory tells us that the larger the surface area, the faster the reaction. So the higher the concentration the more atoms there are to react. There are 4 things that affect the rate of reaction, concentration, surface area, catalysts and temperature.
Fair Test, During the experiment the temperature of the solution will be altered but we will keep the following points the sameâ€¦ * â€¦thermometer , * â€¦amount of hydrochloric acid, * â€¦amount of limestone, * â€¦strength of acid, * â€¦sized pieces of limestone, * â€¦environment in which the experiment the undertaken. Prediction, I predict the experiment where we change the temperature of the solution, will react the fastest, because the particles are moving faster and will have greater effect on the limestone. Where as the concentration of acid experiment, there maybe more acid particles, but they are not moving around as fast and therefore not having as big reaction. As we increase the factor the rate will increase. I predict that if we double the temperature of the solution the rate of reaction doubles as well.
The collision theory states that chemical reactions only occur when reacting particles collide with each with sufficient energy to react. The minimum amount of energy required is called the activation energy. These reactions can occur at different speeds. In our experiment, we are going to alter the concentration of Sodium thiosulphate and see what affect this has on the rate of reaction. My hypothesis is that the higher the concentration the faster the reaction will take place.