This shows that there is a difference in the data which proves accuracy. This is supportive of my conclusion. When the temperature increases the k constant will increase, this is because the molecules have more kinetic energy and there is a higher probability that they will collide and react. I can therefore deduce that the rate equation for this reaction is:. Sorry, but copying text is forbidden on this website! Sodium Thiosulphate and Hydrochloric Acid Coursework. There are a few outliers in my results.
Graphs All of the graphs that I drew for this investigation show a negative correlation. In this reaction although 2HCl molecules are needed for the reaction to take place; however from the kinetics that I found HCl has no effect on the rate and is zero order. I think that my method for my investigation is easy to follow. Rate of Reaction and Specific Rate Constant. When the temperature increases the k constant will increase, this is because the molecules have more kinetic energy and there is a higher probability that they will collide and react.
This involves human judgement rather than a qualitative value that can be used to calculated the rate. The points in the top right are quite far down so this shows a negative correlation. Also from my table of results for changing the concentration of HCl, where all the rates must amd the same ane difference concentrations, there is a anomaly with the 2. If I do a further investigation, I will try to minimise the number of mistakes that I make. Rates of reaction vary depending on which chemicals are being used and the activation energy required.
Keep observing and when the yellow precipitate causes the cross to completely disappear ans the stopwatch.
Limitations My limitations could have been: The conical flask and all other equipment must be clean as any impurities may contaminate my experiment.
Sodium Thiosulphate and Hydrochloric Acid Coursework Essay
My conclusion is justifiable because I have backed it up with points from my data and I have proved all the points that I made. The bars of 1M and 2M overlap and this shows that there is no real difference. These are circled on my graphs.
In my investigation, there was the limitation of room temperature. Instead of using the cross method I would use a light intensity machine that could measure the change in colour over a period of time and stop and start timing when it had reach a certain value.
I will be changing this variable and seeing how it affect the time taken for the reaction to take place and therefore how the concentration affects the rate of the reaction. Record the time taken, wash out the conical flask thoroughly and repeat from step 3 but using the next dilution until all the concentrations have been reacted and recorded. Take care with glass wear, such as pipettes as they are fragile and may hydrochlroic easily.
These chemicals are perfect for my investigation because they are both clear and colourless.
When the solution yhiosulphate made more concentrated, there are hydrochlric greater number of molecules in the same space. This is because there will be more acid molecules in the same amount of solution, therefore more effective collisions with the sodium thiosulphate, and the rate will be higher.
Keep the size of my measuring flask is the same size; this should hopefully make my experiment much fairer and accurate. There is a time error in the time taken when the cross disappears and the delay in stopping the time. Graphs All of the graphs that I drew for this investigation show a negative correlation.
I drew 6 different graphs for this investigation. This ensures that the solution is completely opaque when I stop the timer.
Help Center Find new research papers in: There are also many accuracy errors caused by percentage error in measuring. Each of these steps will have a rate which is due to how many molecules are colliding. To calculate the rate equation and orders of the reaction I am going to use the log function:.
Also when carrying out the investigation for how the rate changes with the concentration of HCl there is no noticeable change in rate when the concentration varies.
Reactions that happen quickly have a high rate of reaction. This again causes an error in the actual time period taken for the cross to disappear.
I did not swirl these together because I wanted to see the rate of reaction without any intervention.
Sodium Thiosulphate and Hydrochloric Acid Coursework Essay Example for Free – Sample words
Leave your email and we will send you an example after 24 hours My Error bar graph shows a negative correlation. This again would give a more quantitative results and increase the accuracy and reliability.
Click here to sign up. I did have some outliers in my results; however I think that the experiment went fairly well overall.