acid strengths affecting rate of reaction

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GCSE Chemistry Coursework

Aim

My aim is to see how the strength of an acid varies how this affects the time is taken to produce 10ml oh hydrogen gas, using magnesium ribbon and 4 different strengths of HCL, 0.2m, 0.4m, 0.7m, 1m.

Hypothesis

I predict that the higher the strength of the acid, the quicker the time taken to produce the 10ml of gas required.

I think this will happen as the stronger the strength of an acid the more h+ Ions to donate, so if the acid has more h(+) Ions then the higher the chance of it not only forming hydrogen gas but producing more of it, in a shorter period of time. Hydrogen gas is produced by, H2= 2H(+) + 2e(-). This then leaves the chloride ions, CL(-) to join with the magnesium and form a salt, magnesium chloride,  CL(-) + Mg(+) =MgCL

Fair Testing

To make sure that the experiments are accurate and fair, I will use a fair and complicated procedure to make sure that the experiment is fair, thus giving more accurate results. These procedures are as follows; 1st I will make sure that the same amount (length) and weight of magnesium is used in each of the experiment, 2nd of all I will make sure that the same amount of HCL is put into the boiling tube in each of the experiments, I will be using 15ml of HCL through-out the experiments. I will then use different strength acids ranging from 0.2m-1m in each of the 4 experiments, and the last thing I will do to make sure that the procedures are fair is to wait until 10ml of gas has been produced before stopping the stopwatch. I will make sure that no air bubbles escapes into the measuring cylinder when positioning it in the trough.

Equipment

  • Test tube rack
  • Boiling tube
  • 10ml of Hydrochloric Acid (40ml in total of different strengths, 0.2m, 0.4m, 0.7m, 1m)
  • 2 measuring cylinders
  • Delivery tube
  • Trough
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Method

I will carry out the experiment by, firstly filling the trough half full with water, then fill a 25ml measuring cylinder full with water, using my thumb put it over the top of the measuring cylinder full with water and place it into the trough making sure no air bubbles escape into the measuring cylinder (meaning it’s a fair and accurate test). I will then place the delivery tube into the trough, again making sure no air bubbles escape into the measuring cylinder I will lift the measuring cylinder onto the delivery tube. Then I will place ...

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