How changing the concentration of acid affects the rate of reaction

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How changing the concentration of acid affects the rate of reaction

Plan

Aim

The aim of my experiment is to see how changing the concentration of acid affects the rate of reaction.

Prediction

I am going to investigate the change in concentration of acid; I will be doing this by increasing the concentration of acid so the rate of reaction will be faster. There are five factors which affect the rate of reaction, according to the collision theroy of reacting particles: temperture, concentration (of solution), pressure (in gases), surface (of solid reactants), and catalysts. I have chosen to investigate the affect of concentration have on a reaction. I predict that as the consentration of the sodium thiosulphate increases the rate of reaction will increase, therefore the black cross will disapear more quickly due to the cloudiness of the solution. This means that the graph in my analysis will have a strong positive correlation, and will probably be curved because of the increase in rate of reaction. This can be justified by using the collision theory. When the consentration is increased the particles will have more energy and will move faster. Therefore they will collide more often and with more energy. Particles with more energy are more likely to overcome the activation energy barrier to reaction and will react successfully. If solutions of reacting particles are made more concentrated there are more particles per unit volume. Collisions between reacting particles are therefore more likely to occur. For a reaction to occur particles have to collide with each other, only a small percent result in a reaction. This is due to the energy barrier to overcome. Only particles with enough energy to overcome the barrier will react after colliding. If the frequency of collisions is increased the rate of reaction will increase, however the percent of successful collisions remains the same. If the concentration is twice as much, the reaction will be twice as fast. During the experiment I used three different types of variables. I will be controlling the variables, I will make sure that the measuring cylinder for Hydrochloric acid and Thiosulphate will not be mixed up, also the amount of acid added will be the same throughout the experiment. This indicates I am doing a fair test, also I will be using Independent variable, this is you deliberately change something. I will be changing the amount of concentration of acid used, 5 times. My final variable is dependent, this is the main thing you are measuring, and in my case I will be measuring the time solution takes to react. These results will help me obtain the resistance.

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Plan

For my experiment these are the apparatus i will be using, below

  • Measuring cylinders
  • Conical flask
  • Goggles
  • Stopwatch
  • Paper with black cross on it
  • Sodium Thiosulphate
  • Hydrochloric acid

I have chosen this equipment for this particular experiment because I thought it would be most relevant to conduct a correct experiment. I have used the measuring cylinders so that i can measure the thio accuratly, also i used the conical flask to store the thio. The paper with a black cross on was used so i could see when the reaction had stopped, I ...

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