Compare how changing the concentration of hydrochloric acid affects the time taken for each experiment.

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To compare how changing the concentration of hydrochloric acid affects the time taken for each experiment.

Aim:        To look how different concentrations affect the time in each experiment.  I will be using concentrations: 3 Molar, 2.5M, 2M, 1.5M and1M.  I will not change the amount of marble chips used in each experiment, but I will be changing the size of marble chips, large and small chips will be used.  The aim of the experiment is to see if the size of chips and different acid concentrations affect the results.

I think that the smaller limestone chips will produce the greater amount of carbon dioxide than the larger chips, as there will be a greater surface area for the acid to react upon. This is because the greater the surface area the higher the amount of collisions between limestone and acid particles. Therefore the smaller chips will lose a greater mass.

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The formula for this reaction is

 Marble Chips + Hydrochloric Acid = Carbon Dioxide + Water + Calcium Chloride

                

                CaCO3(S) + 2HCL(AQ) = CO2(G) + H2O(L) + CACL2(AQ)

Also I think that higher concentrations of acid will make reaction times faster because of the collision theory, this is the more particles in a substance the more they collide together and if there are fewer particles there will be less collisions.

Fair Test

All these factors could affect the test from being a fair test

  • Variable
  • Particle Size
  • Factors remaining the same
  • Same mass of ...

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