How does the concentration affect the rate of the reaction between Magnesium and Hydrochloric Acid?

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How Does the Concentration Affect the Rate of the Reaction Between Magnesium and Hydrochloric Acid?

Aim-I have decided to investigate how the concentration of Hydrochloric Acid affects the time taken for a 2cm piece of Magnesium to fully react and dissolve.

Theory-The following variables can affect the rate of reaction between magnesium and hydrochloric Acid;

Surface Area

With a larger surface area of solid,

collisions between solid and particles

are much more frequent, therefore

more collisions/second equals a greater rate.

Concentration

A larger concentration means there

are more collisions/second because

the particles are closer together.

Temperature

If the Acid is heated then the Acid

particles will have more energy so

this means more collisions/second.

Catalyst

There are no Catalysts for this experiment.

Prediction-In this experiment, I think that if the Concentration is doubled, then the rate of reaction will be a lot faster because of what was mentioned in the theory about concentration. After studying the theory, I made this decision because if there is a larger concentration then there isn’t much space for the particles to move around, so there are more collisions/second between the Acid particles and the Magnesium.

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Preliminary experiment-For the preliminary experiment, my aims were;

  • To see how much Magnesium gives a reasonable time to react?
  • What concentration gives a reasonable time?
  • How do I change the concentration?
  • Can I repeat the experiment reliably?

 

I chose to use 2cm piece of magnesium because it seems like a reasonable amount to use. I decided that 40 seconds was a reasonable time because it was a fairly quick reaction, and it wouldn’t take me long to do these experiments in the lessons. I repeated test ...

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