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To investigate how the concentration of hydrochloric acid affect the speed of reaction with marble chips.

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Marble chips Experiment. Pilot Aim: To investigate how the concentration of hydrochloric acid affect the speed of reaction with marble chips. Prediction: I predict that the more hydrochloric acid there is the faster the chemical reaction. I also predict that the more dilute the acid is (the more water there is with the acid) the slower the chemical reaction. Hypothesis: I predicted what I did because the more concentrated the hydrochloric acid is the more energy there will be and so therefore the more collisions there will be. More collisions occur when there are more acid particles. It is the acid particles that create the collisions and it is the collisions that lead to the reaction. In a dilute acid or a mixture of more water than acid, there will be a slower reaction because there are less acid particles. ...read more.


In this case I will time how long it takes for the water to reach the '50 ml' mark. If I keep the same stop point at '50 ml', I will be able to recognise the affects on the speed of reaction with the different concentrations. Fair Test: I will keep the same overall amounts of mixture of hydrochloric acid and water in the conical flask. The amount of mixture will be 30 ml. I will use the same stop point which shall be at 50 ml. I will keep the same mass of marble chips, which will be 10g and the surface area of the marble chips. I will carefully wash out the equipment and apparatus to prevent contamination of the apparatus and keep the temperature in which I will be experimenting in at room temperature, around 25 degrees Celsius. Apparatus: Conical Flasks. Measuring cylinders. A large bowl. *Bee hive.* Tap water. Bung with tube. ...read more.


7. Add the 10g of marble chips. 8. Then place the bung on top of the conical flask to stop gas escaping. 9. Start the clock immediately! 10. When the water in the measuring cylinder falls to the 50 ml mark, stop the clock. 11. Record the time in a results table similar t the one below. 12. now repeat the steps for 25ml HCl:5ml water 13. Repeat for 20ml HCl:10ml water 14. Repeat for 15ml HCl:15ml water 15. And repeat for 10ml HCl:20ml water 16. Repeat all the above steps twice more so by the end of this experiment you should have three results for all 5 measurements. Results Table: Hydrochloric acid molarity Amount of acid (ml) (3m) Amount of water (ml) Stock (ml) Mass Of Marble Chips (g) Stop point on cylinder Time taken to reach the stop point (s) 30 0 30 10 50 25 5 30 10 50 20 10 30 10 50 15 15 30 10 50 10 20 30 10 50 Nick Blount ...read more.

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