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# rate of reaction

Extracts from this document...

Introduction

Chemistry Rates of reaction. Aim. In this investigation I have decided to study how different concentration of hydrochloric acid can affect the affect the rate of reaction when mixed with sodium thio-sulphate. Reaction rate Reaction rate do not only appear in the lives of scientist and scientific engineers they appear everywhere in peoples lives. For example a one can be worried about what rate your pizza in the oven is cooking at or at what rate is your bike rusting. Reaction rates in Industry In today's world of industry the rates of chemical reactions play an important part. For example the harbour process in which nitrogen and hydrogen are added together to make a product called ammonia. This reaction may seem simple however in the world of industry things are a litlle bit more complicated as in industry people wants the reaction to be quicker and cheap. At normal temperatures and pressures with the absence of a catalyst ammonia is not obtains there for chemical engineers have come up with a solution. An acceptable reaction rate can occur when the atmospheric pressure is 250 and the temperature is 450 degrees. With the addition of an iron catalyst the react6ion is made quicker. What is a reaction rate? The reaction rate tells us how fast the reaction takes place. This represented by how much of a product forms in a certain time or how much of a product is consumed at a certain given time. So it is therefore possible to suggest a simple a formula for one to gain a the reaction rate: Reaction rate = change in amount of ...read more.

Middle

Wear goggles. On a piece of paper I shall draw a circle. In that circle I will draw two lines making an x shape. The two lines drawn in the circle shall have a diameter of 4cm Shall then place the conical flask onto the piece of paper marked with an x. Using a pipit and a measuring cylinder I shall measure 10 ml of HCL 0.2(variable) molar solution and pour it into the conical flask I shall get my assistant to be get ready the stop clock and make sure it is working. Using a different pipit and measuring cylinder I shall measure 10ml of soduimthiosulphate solution and the insert in to the conical flask. As soon as it has been inserted the stopwatch shall be started. Once the cross is completely disappeared and is not visible to my assistant the stopwatch will be stopped and the result shall be recorded. i Shall wash all the conical flasks, measuring cylinder and pipits. I shall repeat the experiment and again however I will change the concentration of HCL. Additional: clean any spills Fair test. The first things I have to take into account are the variables. The temperature of the room I was conducting my experiment in would always have to be constant as a change in room temperature could mean a change in the rate of reaction. The concentration of sodium thiosulphate had to be kept the same as I was testing how an increase in the concentration Of HCl would affect the rate of reaction. ...read more.

Conclusion

Looking at the results I was pleased to gain results, which were predicted and expected. I knew what to expect as my preliminary experiment went well. One can see from the preliminary graph as well as final practical graph that they are both similar and have almost the same negative gradient. I tried to gain my results in the most accurate possible. One must keep in mind that my experiment was carried out in a secondary high school so not all the latest and most expensive technologies were available for me to get the most accurate results. However considering the facilities available my results show that my measurements were correct. There still could have been some ways in which I could have improved my experiment. For example one could have used digital stopwatch instead of an analogue watch to take time readings as this would have been much more accurate and convenient. I tried to make the practical/experiment as fair as possible taking into account all the variables. I knew that my main problem would be the temperature, as I did not have much control over it. However the lab assistant tried to keep the room at room temperature, which was constant. I did try to complete the experiment as quickly as possible without rushing things and being too hasty so if there were going to be any changes in temperature I would minimise the effect of it. Most other variables such as concentration were also not in my control as the lab technician prepared them. There could have been faults with the experiment however my results state other wise. www.chemguide.co.uk Cambridge foundation chemistry module 1 ...read more.

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