These four things increase the number of collisions making the reaction faster.
Fair test
In order for my experiment to be fair, I will
- In each experiment the marble chips will be 10g
- do each experiment twice to see if I go wrong in any experiment
Safe test
In order for my experiments to be fair, I will
- WEAR GOGGLES! If acid squirted into eye or pupil cavity can cause major skin irritation or even burn eyes
- When using acid, handle carefully because it is harmful when it comes into contact with skin.
Prediction
I am predicting that my first experiment with 10g of marble chips with 50ml of hydrochloric acid will be faster than the rest of the experiments.
I think that the higher the concentration the more energy the marble chips get, the more they collide with each other to increase the reaction, the rate of it simply depends on how hard and often the reacting particles collide with each other. If the acid is diluted with water it would make it weaker and also slower to react with the chips of calcium carbonate and because there are less particles of the reactant between the water molecules, which would have enabled it to make collisions and therefore react quicker.
Whereas if the solution has a stronger concentration with less water or none at all it would react at a faster rate, this is because there will be more of the particles reacting and colliding at a more faster rate than a solution with a weaker concentration and large surface area.
The Equation.
Calcium + Hydrochloric Calcium + Water + Carbon Dioxide.
Carbonate Acid Chloride
The Chemical Equation
CaCo (s) + 2HCl (aq) Ca Cl (aq) + H O +Co (g).
Diagram
Results
I am now going to put my results down in a table for each experiment.
1st Experiment 2nd Experiment
3rd Experiment 4th Experiment
5th Experiment 6th Experiment
Conclusion
My results show that the first experiment with the 10g of marble chips and 50ml hydrochloric had the fastest rate of reaction. This fits into my prediction because I said that this first experiment would have the fastest rate of reaction out of all the experiments. The first experiment because there was no water with the hydrochloric acid makes it the most concentrated out of all the experiments because water makes a solution less concentrated. So in being the most concentrated increases the number of collisions taking place which makes the rate of the reaction quicker.
On my graph, the lines do not fit exactly. I presented my graph by putting in a best fit. In doing this I could see if any points were anywhere near to the line or far off the line.
Evaluation
Throughout this investigation I was quite happy because to be honest I knew very well what I was supposed to do (not that I never do) and I carried out the investigation quite well apart from a couple of anomalies. My results are quite reliable and I was able to draw a graph and make conclusions from them (fastest reaction). Only one experiment didn’t fit in the pattern, which I have circled on the graph.
I would do the experiment again to avoid the error I did in this investigation. The error that I made was to speed the reaction up at times I shook the conical flask around which I shouldn’t really have done because it changed the result. In future I will not shake the conical flask and I will use a magnetic stirrer to keep the same the velocity of speed.
I would definitely do this experiment again because the results I have obtained