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Investigation to find out how the rate of reaction between Sodium Thiosulphate and hydrochloric acid that is affected by changing the concentration.

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Magnesium + Hydrochloric Acid Investigation PLANNING Introduction Investigation to find out how the rate of reaction between Sodium Thiosulphate and hydrochloric acid that is affected by changing the concentration. Preliminary Experiment Aim To investigate the rate of reaction between: Sodium Thiosulphate and Hydrochloric Acid by changing the concentration. Apparatus * Beakers - to pour each substance into * Measuring cylinders - to measure the amount of each substance * Stop clock - to time the reaction * Conical Flask - to pour in all the substances and mix together * Paper with a red cross - to watch as reaction takes place * Hydrochloric acid - for the reaction to occur * Water - for the reaction to occur * Sodium Thiosulphate - for the reaction to occur * Pipette - to take a small amount of solution Hypothesis (Prediction) I predict that as the concentration of the sodium thiosulphate increases the rate of reaction will decrease. This is because if the concentration of a solution is increased there are more reactant particles per unit volume. This increases the probability of reactant particles colliding with each other. ...read more.


The concentration of the acid affects the rate of reaction because, the higher the concentration of the acid (let's say 2 molars) will cause the reaction to happen quicker compared to a less concentrated acid (let's say 1 molar). If the solution is made more concentrated it means there are more reactants colliding between the water molecules, which make the collision between the important particles more likely. In a gas, the pressure simply squashes the molecules together so there are more collisions. On the diagram below, on the left hand side there are less concentration, less particles and slower reaction. However on the right hand side diagram there is more concentration, more particles and quicker reaction 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. The minimum energy that a particle must have to overcome the barrier is called the activation energy, or Ea. An increase in the frequency of collisions can be achieved by increasing the concentration, pressure, or surface area. ...read more.


Then place a piece of plastic on top of the measuring cylinder, preventing water to spill out. Place a boiling tube on a test -tube rank. The boiling tube must have the magnesium ribbon placed inside it. Then we will pour the Hydrochloric Acid into the test-tube. When pouring the hydrochloric acid into the test tube I will make sure that I wear safety goggles. Start the stopwatch, and take the measurements of the reaction time, until it finally finishes. Then record the results into a table and then find out how to work out the average. I will repeat each experiment to make it a fair test. Results Below is a table in which I will place all of my gathered results at the end of the experiment. Experiment No. Volume of Thiosulphate/cm� Temperature (�C) Volume of Hydrochloric Acid/ cm� Time Taken for Cross to Disappear/s 1 25 60 5 2 25 50 5 3 25 40 5 4 25 30 5 5 25 20 5 I will then be able to analyse the results and see whether my hypothesis was correct or not. If it isn't then I shall investigate further to see where I could have possibly gone wrong. ?? ?? ?? ?? Hemali Amin Chemistry Coursework S4G Pg.1 ...read more.

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