I predict that the higher the temperature of Hydrochloric acid , the faster it will diffuse.
Found my information at
What are the factors that affect chemical reaction rate?
Answer: foundation energy, temperature, method, concentrations, particle size, and surface area
Reactive impact: Chemical reaction takes place only when two reactants collide under the right conditions. The higher the temperature the more reactants with kinetic energy above the activation energy
Effect of temperature—increasing temperature to overcome the activation energy barrier and to increase entropy (a measure of the confusion of the molecules in a substance)
Effect of concentration—increasing colliding frequency
When you heat a solution up the partials speed up and in this case move the partials in the agar so much it forms a chemical reaction.
The apparatuses we are going to use are: 1 cm² agar, boiling tubes, water baths at different temperatures, ice, boiling tube rack, Hydrochloric acid, spatula, stop watch, measuring cylinder and a thermometer.
Experiment
Switch on the water baths to warm up to a certain temperature. Crush the ice up in a bowl. Measure how much acid you need in a measuring cylinder. Pour it into a boiling tube and place in the water baths/ice and wait for it to get at a certain temperature. Just to make sure of the temperature, measure it with a thermometer. When it has reach that temperature get your stopwatch ready and place the 1cm² of acar in the acid. While its starting off write all the temperatures you will do on a results table. The diffusion should make its way into the centre of the cube.
When all the purpleness has gone competely stop the stopwatch and record the time on your table. Then repeat that procedure two more times for that temperature then for all the rest.
We are doing four temperatures to make sure our prediction is correct, we are taking the measurements: 0, 20, 60 and 70 degreese.
We don’t need to take preliminary work before because we are doing freezing point, room temperature, 60, 70 and maybe 100 degrees to make a kind of a range of temperatures.
When we do the experiment we are wearing our school uniform so we are tucking our ties in and taking are blazers off. To pretect our eyes we are wearing safety goggles and using spatulars to pick up the agar because its an alkali and it can damage your eyes and it wouldn’t do any favours to our bodies. If you do touch the agar wash hands straight after as well as after the experiment has finished because we will be having food afterwards. Make sure bags and chairs are tucked in under the table so no one trips over them, they may be carrying acid. When doing the experiment don’t mess around.
As the temperature increases the time decreases. Our prediction is correct. It provess that the higher the temperature the shorter the amount of time it takes. Maybe at a 100 degress the reaction would have been much faster. If we had maybe done a few more experiments the results might of shown more. So, when we change the temperature what happens to the agar is is when we increase the temperature, the Hydrochloric acid diffuses much quicker.
Evaluating
The problems we meat on the way were the water baths changing temperature because the room temperature was lower than the water baths. The only one that may be completely correct is the ice temperature because that was the only one that stayed at a constant temperature. When we stopped the stopwatches the agar may have already of gone or not disappeared completely so there may have been a human error.
The 60 and 70 degrees may be wrong because the temperature wasn’t constant. The 20 degrees may be correct because there was a window open in the 2nd lesson of doing the experiment so it may have been colder.
Our results were kind of evidence because they weren’t all accurate, but they still showed a faint pattern.
If we had more time we could of done more experiments to correctly prove our prediction and not have to rush all the experiments by doing them at the same time. That may of faulted our results was doing them at the same time with one stop watch. It could have been good because that would of meant they were at the same temperature instead of different varying temperatures. If you did them separately they would of varied at different rates. When we repeated the ice one there was a five minute gape between the 1st and the 2nd and 3rd.
Between 20 and 60 is a wide gape so if we do it again then do it every 10th or 20th of a 100. There may have been a to narrow gape between 60 and 70 compared to 0 and 20.
We can and cannot use our results because they are correct in terms of our prediction and we cannot uses them because they aren’t completely correct.
We could make the investigation better is if all the temperatures could stay constant and have more time to do more varied temperatures to completely back up my conclusion.
May be to get more evidence then do the concentration of the acid and the amount of acid to see which one has the most effect on the agar.
By Katie Blewett
