Factors affecting the rate of a reaction

Authors Avatar

         Factors affecting the rate of a reaction by Jason Phelan

AIM:

My aim is to study the rate of the concentration of a chemical called Sodium Thiosulphate (Na25203) and investigate which certain factors/variables I may change and which factors I do not change during my experiment. In my investigation I will plan my experiment explaining how to obtain your results using a method that I will provide, and I will also mention what chemicals and apparatus I will use for the experiment.

PREDICTION

I predict that when I add 5cm3 of hydrochloric acid each time to my solution, and change the amount of Na25203 (Sodium Thiosulphate), remembering to balance my solution with water (keeping the solution a 55cm3), then you will find that when you double the amount of Na25203, then the rate of how fast the reaction takes place will also double. This is because the Sodium Thiosulphate and the rate of the reaction are both proportional to each other, meaning that they both go up in steady intervals. I know this will happen because in my science lesson I found out that when you increase Sodium Thiosulphate, (thus meaning there is more particles in the solution), the Hydrochloric acid particles collide more often with the Thiosulphate particles meaning the reaction (the rate) takes place a lot more quicker.  

DETAILS

During my experiment several factor will have to be changed in order to get a decent set of results. I will change the amount of Na25203 in steady amounts of 5cm3 each reading (25,30,35..), by doing this I will be gaining different results on each reading. I will also be changing the amount of water each reading in the investigation. The water does not play a role in the reaction, it just keeps the amount of liquid in the solution the same at a fixed measure of 55cm3.  

 

I will not be changing certain things in the experiment as well. I will not change the amount of Hydrochloric acid each reading it will always stay at 5cm3, it will NEVER be change in order to keep the investigation a fair test. I must also measure the chemicals in measuring tubes so the measurements are precise. When I do the experiment I will use an X on a piece of paper and I will be able to tell when the reaction has finished when I can no longer see the X and then I will stop the clock. I do not need to change the X during the experiment just to make sure its fair. Finally I will not change the temperature of the solution because heat can affect the reaction by speeding it up, so the solution must stay in the same room.

Join now!

APPARATUS  

In the investigation I will need to use the following apparatus which are as followed:

  • A good amount of Sodium Thiosulphate (Na25203)

  • A smaller amount of Hydrochloric acid, 2HCL (aq)    

  • 2 measuring cylinders, one in intervals of 2’s (small) and one in 10’s (large). These will be used for the Na25203 and the 2HCL(aq), the water can be measured in the Na25203 tube because its parochially diluted with water.

  • A conical flask should ...

This is a preview of the whole essay