I am also going to use roughly the same size and weight chip or tablet.
Diagram
Here is a diagram of the equipment that I used for my experiment and in the way that it will be set out for me to precede in doing my experiment in the best possible way.
Prediction
Having looked back at my previous knowledge of this I am going to predict that the higher the molar of hydrochloric acid I use the faster the rate of reaction will occur I think this is because the stronger the acid the faster the positive (+) hydrogen ions move around resulting in much more collisions resulting in the acid reacting with the reactant (in my case a limestone chips resulting with faster rate of reaction.
Results to my preliminary work
Here are the results that I found when I did my preliminary work using limestone chips.
Conclusion
Having finished conducting my preliminary experiment I have noticed by looking at my results thoroughly that my prediction of which I said that the higher the concentration I use the faster the rate of reaction is right because I have noticed that it takes less time every time I put the concentration of the acid up such as 1 molar took 20.30 minutes to get rid of 50ml of water where as the 1.5 molar only took 16 minutes to get rid of exactly the same amount of water (50ml). I also noticed that sometimes when I went to read the amount of water gone after each 30 seconds that some times none had gone and it was the same as before and then another time it has gone up by quite a lot.
Evaluation
Having finished my preliminary experiment I have noticed that there is going to be a few changes that I am going to make to my main experiment when I do it to make my main experiment the best I possibly can, I am going to change my reactant from limestone chips to soda mint tablets because when I used limestone chips it wasn’t always a fair test because I never got to chips exactly the same size where when I use soda mint tablets they are all exactly the same size and weight with exactly the same surface area all of the time so that the experiment is the fairest I can possibly make it. I am also going to repeat the experiment three times with each of the molars and then find the average for each of the times so that I get the best results possible.
Main experiment using soda mint tablets
For my main experiment I have decided to use Soda mint tablets as my reactant instead of limestone chips this is because it will make it more of a fair test because they are all exactly the same size and weight with exactly the same surface area all of the time so that the experiment is the fairest I can possibly make it. I am also going to repeat the experiment three times with each of the molars so that I can get the best results possible for this experiment.
Method
- Collect a pair of goggles
- Collect all of my equipment and set it all up
- Put a measuring cylinder full of water upside down inside a half full bowl of water.
- Connect a delivery tube to the bottom of the measuring cylinder and to the chronicle flask.
- Fill the chronicle flask with 20ml of hydrochloric acid.
- Collect a Soda mint tablet and drop it into the chronicle flask full of 20ml of hydrochloric acid.
- Start the stopwatch and record down every 20 seconds how much water has gone out of the measuring cylinder.
- Repeat the whole procedure for each of the different molars of acid going from 1molar, 1.5molar, 2molar, 2.5molar, and 3molar. Repeat this three times for each of the molars so that I get the best possible results.
- Record all of my results in a clear results table.
Safety
To make sure that I am doing my experiment safely I am going to make sure I am wearing goggles at all times, I am going to make sure that I have got a heat proof mat underneath my experiment at all times and also to make sure I take my time when walking or carrying glass or acidic objects.
Fair test
I am going to use the same amount of acid and water in each of the experiments that I do, I am going to use 20ml of hydrochloric acid and I am going to use 50ml of water.
I am also going to use roughly the same size and weight chip or tablet.
Equipment
- Hydrochloric acid (different molars)
- 15 times soda mint tablets
Prediction
Having looked back at my preliminary experiment I am going to predict that the higher the molar of hydrochloric acid I use the faster the rate of reaction will occur I think this is because the stronger the acid the faster the positive (+) hydrogen ions move around resulting in much more collisions resulting in the acid reacting with the reactant (in my case a Soda mint tablet) this will result in a much faster rate of reaction.
Results
Here are the results I found when I used soda mint tablets instead of limestone chips.
Conclusion
Having finished my experiment I have noticed that my experiment worked a lot better this time then my preliminary experiment did when I used random sized limestone chips because this time I used Soda mint tablets because they are all exactly the same size and weight with exactly the same surface area all of the time so that the experiment is the fairest I can possibly make it. I also noticed that when I used soda mint tablets instead of limestone chips they reacted a lot faster with the hydrochloric acid then the limestone chips did, I know that this is because soda mint tablets have got exactly the same size surface area on every tablet where the limestone chips were all different sizes and were never the same size as the one I used before. I have also noticed that the prediction I made was correct and that soda mint tablets did work a lot better then the limestone chips. I also noticed that I didn’t have any anomalous results within my results table or graph. This tells me that my experiment went just as planned and that all my results ended up how I thought they would do and not end up wrong and all out of place results. I also noticed that when I used 1 molar of hydrochloric acid it took twice as long as the time I used 2 molar and 1.5 molar took twice as long as the time that I used 3 molar and the 2.5 molar. This was also a fair test because I did all of the experiments on the same day so all of the experiments were conducted within the same day and under the same temperature and surroundings. But I am not sure whether or not the acids were exactly the right molar because I didn’t check them before I conducted the experiment, which is something I would check at the start if I were going to this experiment again. I also know that after each experiment I didn’t clean out the pipette so it could have had little fragments of other acids which could either make other acids stronger or diluted them to make them weaker.
Evaluation
Having concluded my experiment I do not think there is many ways in which I could improve my experiment as I got all of the results I expected and didn’t get any anomalous results. The only way in which I think I could of improved my experiment was if I used digital recordings of how much water had gone then just to look at a measuring cylinder. I think that my choice to use soda mint tablets instead of limestone chips was correct and paid off as it worked out a lot better and it got me a lot better results I also think I was right to use these because it was a lot quicker then the limestone chips for example when I used limestone chips it took 20.30 minutes with 1 molar of hydrochloric acid and when I used soda mint tablets it only took 3 minutes for the reaction to happen with 1 molar and it only took 1 minute with 3 molar with a soda mint tablet and it took 6.30 minutes with a limestone chip which is over double the time.
