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The rate of the reaction between sodium thiosulphate and hydrochloric acid.

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Introduction

The rate of the reaction between sodium thiosulphate and hydrochloric acid Introduction In this experiment, I will use sodium thiosulphate plus hydrochloric acid to see how the rate of reaction change, by heat the sodium thiosulphate before add the acid. The equation of sodium thiosulphate plus hydrochloric acid is : Sodium thiosulphate+Hydrochloric acid � Sulphur + Sodium chloride + Sulphur dioxide + Water Aim To see how temperature affects the rate of the reaction between sodium thiosulphure and hydrochloric acid to form sulphur. Prediction If the temperature of sodium thiosulphate is higher, the rate of sulphur formed will be faster, that mean the time of reaction will be shorter. On the opposite side, if the temperature of the sodium thiosulphateis lower, the rate of sulphur form will be slower, that mean the reaction will be longer. Scientific background The rate of reaction always affect by the temperature, concentration of the solution and the subdivision. Temperature: If the temperature is higher, it will be reacts faster. Because higher temperature give more energy to the particles and let them have more frequent collision. It cause they move more quickly. The other reason is they can get more energy from high temperature to break down the chemical bonds. As the result, more of the collisions will produce more products, so the rate of reaction will be faster . Concentration of the solution: More concentrated solution will reacts faster, cause higher concentration solute particles make more frequent collisions The subdivision: ...read more.

Middle

after heated it to the planned temperature, put the hot sodium thiosulphate into the conical flask, and start the stop watch. 8. let it mix with the hydrochloric acid, look at the cross through the flask carefully. 9. wait the solution turn to milky, and until can't see the cross then stop the stop watch. 10. record the time it take and repeat above step to do the experiment against, but the temperature of the sodium thiosulphate will be less 5 degree every time until 15?. Result There are the result of my experiment(first time): Temperature of sodium thiosulphate(?) Time it turn to milky(can't see the cross)(sec.) 15 201 20 148 25 123 30 77 35 61 40 46 45 46 50 41 55 35 60 30 65 27 70 17 75 13 80 10 85 6 The second time result: Temperature of sodium thiosulphate(?) Time it turn to milky(can't see the cross)(sec.) 15 219 20 176 25 139 30 87 35 68 40 54 45 45 50 43 55 36 60 30 65 24 70 16 75 14 80 13 85 10 The average of two experiment: Temperature of sodium thiosulphate(?) Time it turn to milky(can't see the cross)(sec.) 15 210 20 162 25 131 30 82 35 65 40 50 45 44 50 42 55 36 60 30 65 26 70 17 75 14 80 12 85 8 After I do the experiment, I find out if the temperature of sodium thiosulphate higher, the reaction will take shorter time, that mean the reaction will be faster. ...read more.

Conclusion

But just one result in my first experiment in 45?, it should be shorter for few sec. The other result are all right. On the other side, I also find some difficult when I doing the experiment. Such as, when I mix that two solution, I can only use the thermometer or use my hands to shake the flask to help to mix it. So I think, next time I do the experiment I will use a glass rod to help to mix it. And when the sodium thiosulphate in the room temperature is 20?, so I need to use ice with cold water in a big bowl and put the beaker of sodium thiosulphate to make it cold until 15?. Also, when the temperature of sodium thiosulphate is low( in 15? -25?), it take ages to react. But the time let me to do the experiment is not enough. So I mix two different temperature sodium thiosulphate with acid at the same time. So I need two sets of equipment for make I can do this experiment on time. In this time, because I have enough data, I can't calculate how does the reaction slow down and stop. I need more data to calculate this. So if I do the experiment next time, I will also measure the temperature of the solution when it reacting and when does it stop to change. The reaction stop because of all the solution has reacted. If I get the temperature when it is reacting, I can also calculate the speed of the reaction. Connie Au Year10 44335 ...read more.

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