Investigating the rate of diffusion of ammonia :: GCSE Chemistry Coursework Investigation

Investigating the rate of diffusion of ammonia Investigating the rate of diffusion of hydrochloric acid in agar Planning You can change different things you do to an experiment like the amount of acid, temperature, size of the agar or concentration of the acid. We can measure/observe on how long it takes to diffuse or the amount diffused each minute. My partner and I are going to predict and measure the rough time it will take to diffuse at different temperatures. The factors that may affect the readings of our results are if the temperature of the room may reduce the temperature of our water baths or if the windows open. There may be a human error were the person which is timing may not get it exactly correct or you may not be able to measure the amount of acid correctly. We are going to do the experiment three times and work out the mean time by adding the times together then dividing by however many readings you’ve added. You have to do them three times just in case the temperature varied. But you should get them roughly around a time. To make it a fair test you must only change one factor. The factors that we are keeping the same are the amount of acid you test it in, the size of the agar cube and the container you do the experiment in. You have to keep the container the same because with a wider container will make it seem like there is only a small amount of acid were as a boiling tube would make it seem like there is quite a lot. The factor that we are changing is the temperature of the water bath, which we will keep it in for however long it takes to diffuse. I predict that the higher the temperature of Hydrochloric acid , the faster it will diffuse. Found my information at www.britannica.com What are the factors that affect chemical reaction rate? Answer: foundation energy, temperature, method, concentrations, particle size, and surface area Reactive impact: Chemical reaction takes place only when two reactants collide under the right conditions. The higher the temperature the more reactants with kinetic energy above the activation energy Effect of temperature—increasing temperature to overcome the activation energy barrier and to increase entropy (a measure of the confusion of the molecules in a substance) Effect of concentration—increasing colliding frequency When you heat a solution up the partials speed up and in this case move the partials in the agar so much it forms a chemical reaction. The apparatuses we are going to use are: 1 cm ² agar, boiling tubes, water baths at different temperatures, ice, boiling tube rack,