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Plan to investigate the factors that affect the rate of reaction between sodium thiosulfate and hydrochloric acid

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Introduction

´╗┐Factors that affect the rate of reaction between sodium thiosulfate and hydrochloric acid Aim: To investigate the factors that affects the rate of reaction between sodium thiosulfate and hydrochloric acid. When sodium thiosulfate reacts with hydrochloric acid, sulphur is produced. The sulphur is produced in very small particles and causes the solution to cloud over and turn a yellow. There are several different factors that affect the rate of a chemical reaction. In general, a factor that increases the number of collision between particles will increase the reaction rate whereas a factor that decreases the number of collisions between particles will decrease the reaction rate. The factors are listed below: Changing the temperature of the reactants ? This would affect the results of the experiment because as the temperature of a solution increases, the particles gain more energy, due to the heat. Energized particles move faster and this increases the chance of the particles colliding with each other and increases the force that the particles hit each other with. ...read more.

Middle

This increases the rate of reaction as there are more successful collisions per second while decreasing the surface area would decrease the rate of reaction. Introducing a catalyst to the solution could affect the results of the experiment because a catalyst is a substance that changes the rate of a reaction and doesn?t get changed up or used in the process. I have chosen to change the concentration of sodium thiosulfate because I am unable to change the surface area of the reactants, as there is no solid in the reactants. A catalyst would be difficult to find and changing the temperature would be difficult to change, as we would need to use a water bath and it would mean we o he experiment on one day. So I have decided to change the concentration of the sodium thiosulfate. Hypothesis ? I will measure the how long it takes for the sulphur to form, or in other words, how long until we cannot see the cross. ...read more.

Conclusion

* Digital Stop clock ? Used to time how long it took for the solution to turn cloudy and it?s a more precise reading than an analogue clock as they are nearest to hundred to the second. * Paper marked with ?X? ? Used to see whether the solution is cloudy enough to make the ?X? not visible. Method ? * Draw an ?X? on a piece of paper and place under a conical flask ? We will be measuring how long it takes for the cross to disappear, so it should be clear, bold, and easily seen before the experiment starts. * Add 5ml of hydrochloric acid in the measuring cylinder using a pipette and add the solution into the conical flask * Add 25ml of sodium thiosulfate into the conical flask and immediately start the stop clock. * Swirl the conical flask around, observing carefully * When you can no longer see the cross, stop the stop clock and record the time * Repeat this with the other concentrations of sodium thiosulfate. ...read more.

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