There are 2 outliers Improvements and further investigations: I will discuss these further in my evaluation. This is the reaction I will be considering: In this reaction the solution turns milky yellow as sulphate is displaced and forms a solid precipitate. To reduce this error I would choose another method of measuring the rate. This means its is hard to control this factor which is affecting the rate of the reaction.
The timer was stopped when in see the black cross through the cloudy solution could no longer. The dependent variable is the one that will be monitored in the reaction. The bars of 1M and 2M overlap and this shows that there is no real difference. Remember me on this computer. This will show me the affect of each reactant on the rate independently. I did have some outliers in my results; however I think that the experiment went fairly well overall. Keep observing and when the yellow precipitate causes the cross to completely disappear stop the stopwatch.
Therefore the slowest step in this reaction is the breakdown of 1 Sodium Thiosulphate molecules as the reaction is 1st order.
Sodium Thiosulphate and Hydrochloric Acid Coursework Essay Example for Free – Sample words
Another error is in the variation of temperature. In this reaction the solution turns milky yellow as sulphate is displaced and forms a solid precipitate. hdyrochloric
Dependent variables are not controlled by the experimenter. Sorry, but copying text is not allowed on this site. This shows that there is no real difference between the results.
The enthalpy change is the amount of heat absorbed or released when a chemical reaction occurs at a constant pressure. If broken clear up all glass immediately. There is one outlier in 2M concentration. When using the graduated there was an error of 0. This could have happened because of calculation errors, human errors, recording errors or a fault with the equipment that we used.
For example, when my concentration was 1M the average reaction time was seconds, and then when the concentration was 5M the average reaction time was seconds. Use of rate of reaction in industry The chemical industry makes medicine and many other substances such as; Limestone – this is used for building Sulphuric acid — used to make other substances Ammonia – used to make fertilisers. Each of these steps will have a rate which is due to how many molecules are colliding. I have calculated the gradient of my line to support my hypothesis and found that: To try and insure the same temperature is used I will have all reactants at room temperature and carry out all the reactions in one lesson.
Your Answer is very helpful for Us Thank you a lot! Start by making the concentrations, using a tyiosulphate pipette measure out the correct volumes of Sodium Thiosulphate and put into 5 small 50cm3 beakers.
(DOC) GCSE CHEMISTRY RATES OF REACTION COURSEWORK | Anjelina Qureshi –
This fits in with my hypothesis and my data. I did, however find some outliers in my results.
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. Sodimu also made sure that the measuring cylinder was on a level surface so that I could clearly see how much liquid I was putting in to hydrochlorix. Sodium Thiosulphate and Hydrochloric Acid Coursework. If you need this or any other sample, we can send it to you via email. Using white paper helped the marking to stand out.
Using another graduated pipette, place 25cm3 of 2M hydrochloric acid into the bottom of the conical flask.
This could thoosulphate happened because of human error, wrong calculations or simply not enough activation energy on that particular concentration. Then add the corresponding amounts of distilled water and label with the correct concentration. This makes sure that my experiment runs smoothly.
In a most reactions the mechanism is not made up of one step but a series of intermediate stages where molecules form and break down.
Sodium Thiosulphate and Hydrochloric Acid Coursework Essay
However the overall order for the reaction cannot be calculated using the stoichiometry in the overall equation. Hydrochloric acid is colourless, poisonous and highly acidic. As soon as the chemicals were in, I started the timer. The rate of reaction is the speed of a reaction. I had to make sure that my classmates were safe as well as myself. My conclusion is valid because it includes evidence that my data is accurate and I have summed up my experiment in it.
Another limitation of the procedure at the start of the timing and I had to add the chemicals together and start the stopwatch.