To investigate how does the concentration of Hydrochloric acid affect the rate of reaction?
Outline
I aim to discover how different concentrations of Hydrochloric acid influence the rates of reaction. In order to carry out this investigation I have decided to use marble chips, which I will vary the sizes as powder, small chips and large chips. I will also be changing the concentration, the different concentrations are as follows 0.2m, 0.5m, 1m, 1.5, 2m. I have chosen these concentrations as they have a good range, we have to take this in to account, in view of the fact that if I was to use a concentration lower than 0.2m, the rate of reaction will be to slow or if I was to use over 2 molars, it is too dangerous to handle and violates
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I have also found that the big marble chips take way too long to react with in both volumes of HCL. The marble chips which are in a powder form react too quickly and there was some marble chips remaining within 2cm ³ of HCL. These results tell me that the right size to use for my main experiment will be the small marble chips and I will need to use a higher volume of HCL.
Equipment
Conical Flask Bung Water (H20)
Measuring Cylinder Stop Watch Hydrochloric Acid (HCL)
Safety Goggles Water Bowl Small Marble Chips (CaCo3)
Delivery Tube Weighing machine
This is a diagram to show equipment setup
Method
1. Bring out equipment (including all concentrations of HCL needed in experiment and small marble chips)
2. Then put water in to my water bowl
3. Next clean my conical flask and delivery tube
4. After that I will fill my measuring cylinder with water in my bowl of water, making sure there is no bubbles in the tube and then turn it upside down (as shown in the last page)
5. Wear safety goggles and put chairs under desks
6. Weigh 1 gram of marble chips, using weighing machine
7. Measure and pour 30cm³ of HCL in to conical flask
8. Put delivery tube in to measuring cylinder and bung (as shown on the last page)
9. Make sure stock clock is ready
10. Someone has to hold the measuring cylinder upside down until the 20cm³ of gas
The measuring cylinder was then used to accurately measure out 20 mL of water, which was then poured into the test tube that would be used for the experiment. The test tube was then placed into the clamp, which was then adjusted in order to make sure that the test tube was grasped firmly and would not fall out.
Next, I poured distilled water just below the 250ml mark on the neck of the volumetric flask.
In the lab we filled the first beaker up with water. Then we took a pipet (filled with the liquid) and dropped water droplets onto the
1. Fill the graduated cylinder nearly to the top with water, with a tall glass tube open at both ends (the water level with act as the closed end).
The pre-test helped us decide the exact details of our experiment. We started off with testing 25cm³ of 3-molar hydrochloric acid to 2g of calcium carbonate medium size chips (we decided a medium size chips before we started our pre-test as we had a choice of 3, small, medium, large). We saw that this reacted too quickly as we used 10 second intervals and we couldn't get 6 results this is because our burette could only hold 100cm³ of water, which would make our results reliable. We then decreased the amount of Calcium Carbonate to 1g and kept the same 25cm³ of 3 molar hydrochloric acid and 10 second intervals. We could get the right amount of results of this, so we then tested the other extreme - the lowest molarity.
If one result is out of line with the others then that will be easily identified using graphs and tables. The concentration has been picked so that there is a range from 0.25M to 2M, at intervals of 0.5M, 1M, 1.25M and 1.5M. Prediction: I predict that the higher the concentration the faster the reaction will take place meaning the light intensity will drop by 10%. This is because the more concentrated the hydrochloric acid is the more particles there are to collide, therefore more effective collisions to break old bonds and make new bonds. 0.25M concentration would be the slowest reaction and 2M would be the
1. Carefully measure the volume of the trapped gas using the graduations (markings) on the side of the container.
Measure 500ml of tap water in the 500cm3 beaker, then measure 5g of sodium hydrogen carbonate using the 50cm3 beaker and weight scale and place in the beaker of water, using the glass rod to dissolve it into the mixture.
Fill a test tube about 1/3 full with cold tap water for use in step 34.
Before beginning an experiment, it is good to calibrate any equipment that needs calibration. This ensures that results obtain will be as accurate as possible or as near to the true value. All equipment should be inspected to ensure that there are no chips, cracks or general damage to the equipment as these could cause problems during the experiment which could affect the overall results gained. Equipment such as burettes, pipettes, flasks and beakers must be rinsed with distilled water to get rid of any impurities in the equipment. If solutions are to be poured in any piece of equipment then the equipment should also be rinsed out with the solution being used, this will maintain the pH level in the instrument. Once a solution is transferred from the pipette to the flask, touching the tip of the pipette on the side of the flask will drain any extra drops that may still remain on the tip of the pipette.
4.Measure 35mL of warm water and add them into each of the 4 test tubes at about roughly the same time. It is essential that the water is warm. Do not seal the test tube.
1 ml of water should be added to the first test tube and make a note. In the second test tube, 1 ml of methyl alcohol should be added. In the third test tube, 1 ml of hexane must be added. Lastly, the fourth test tube will be a control.
Equation of magnesium and hydrochloric acid: 2 HCl+ + Mg [IMAGE]Mg2+ + H2 Measuring rates of reaction In this investigation there are two experiments that can be used to test rates of reaction. Using a gas syringe As more gas is produced the plunger inside the syringe moves out of the syringe so the gas can be measured by marks on the syringes length.
Measure the correct amounts of sugar and water into each of the labeled cups. One at a time, place a cup on the scale and add the sugar directly, but before you do so, hit the button “on” or “zero” to restart the scale. This way, the scale will only measure the amount of sugar that is poured into the cup and not the cup itself. The chart shown below will tell you how much sugar to weigh in each cup. Once you have finished, add 50 mL of water to each cup using the graduated cylinder. Then stir your cups with the spoon until the sugar has dissolved in each solution.
This is a fair test because the only thing that is changed is the drop