The way I will make my method safe will be top wear goggles at all times when I’m using acid and to heat the acid to a safe temperature and not boiling temperature. I know from previous experiments that if you heat the acid too far it will just evaporate and if you use a short length of magnesium then it will run out over a few seconds and you will only get a couple of readings. I have refereed to some sheets that I found on the internet and also read the school books that were open to my viewing in class time. I did do some primarily results these were to find out what molarity of acid I wanted to use and the one I decided on was 2M of acid and to use a good length of magnesium ribbon so it lasted long enough to get a few readings.
Equipment
Conical flask
Gas suringe
Retort stand
Gauze
Tripod
Thometer
Hydrochloric acid
Mg ribbon
Safety glasses
Water bath
Prediction
The variable I am changing is the temperature of the acid. This will be done by heating the acid with a water bath as if it safer and easier and checking the temperature until it is at the temperature. I think that the more hotter the acid the faster the magnesium ribbon will react with the acid. This is because the more heat energy you give the acid the more kinetic energy is in the acid the more the particles move around and this acid particles are moving faster and will collide more often with the Mg ribbon causing H gas to produce quicker! This is why the magnesium reacts faster. Particles in the acid are not very active when they are not heated but when you add energy like heat the particles collide more often and cause a reaction to happen like the acid heating up.
The reaction needs something to start it some kind of spark like when you light a gas cooker you need the matches to cause the reaction this trigger is called activation energy
Fair Test
The way I will make it a fair test is to make sure that the lengths of magnesium ribbon is the same each time which will be 8cm. Also I will make sure that the acid is that same volume each time. I will make it a fair test by washing the conical flask thoroughly and drying it thoroughly each time if I wanted to make the experiment more fair I would use a new conical flask each time. My concentration of acid will stay at 2M.
Readings
In my experiment I will take five readings one at these heats of acid 10,20,30,40,50°с and this will be 2M acid. I have chosen these times because it will produce a fair amount of results over a time that is well spread out. The length of magnesium ribbon will stay the same.
I will not record outside of my limits because then it will get confusing and I do not need to there is no place for it in my experiment. In the magnesium I will measure to the nearest millimeter when cutting it with a pair of scissors. My acid will be measured in millimeters to get the most accurate measurement to make it a fair test. I will repeat my results twice to make sure that my results were not just fluke or anomalous.
Obtaining Evidence
Before I start my experiment I will make sure my table is clear so when I use the flame I will have nothing it can react with to make fire. While I am working I will be wearing safety glasses and make sure the acid does not touch my skin if it does I will wash it in cold water straight away.
I have experimented of different was of spreading my work out in a results table and I think the best one would be this one
I think this shows my results quite well and is quite clear. I have repeated all of my results I think this is important to make sure I have not got any anomalous results. The units of measurement I have record in are millimeters and molars for my acid and centimeters for my magnesium ribbon.
Conclusion
From my results I can see that the more heat the more gas is given off in 3,6,9,12,15 seconds. This is what I predicted in my prediction and I was right I knew this from my prediction and I knew from my research. From this I can say that my scientific findings are right the more heat the more kenetic energy and the more movement in the particles. My results rose steadily the more the gas particles were heated the faster the reaction. My experiment was good cause as you can see from my prediction everything went to [plan
Evaluation
My last result on my set of results 2 are anomalous results at 40°с they go up then it goes down again this is weird. This could have been because of the gas suringe could of get stuck. I think must of my measurements are within 5% accuracy. This could have been less if I would have been concentrating on my work and not on people.
I think it was a fair test I tried to make it a fair test and I think I did a good experiment but there are many ways that I could of made it better:
>I could of used a new conical flask for each time I did the experiment
>I could of made sure the conical flask was furelly dry before use
>I could of used different batches of acid because they can be exactly the same concentration
If I had to re-do my experiment I would take more results as I would get a better range and have more to compare this would make my experiment more accrete and more conclusive. During the test the difficulties I faced were trying to get the heat to the right temp at the right time and trying to put the bung and the magnesium in at the same time we had to start the timer that was hard to do. I would make sure that the conditions on the day were the same
i.e. The temperature of the magnesium before it went in the acid.
Evaluation Evidence
Among my results there are a couple of results that are errors. This could have been because the gas suringe got caught or the room temperature could have been different.
