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Rate Of Reaction Coursework Essay

1198 words - 5 pages

Investigate if changing the concentration of an acid will change the rate of the reaction when marble is dissolved in hydrochloric acid.


Marble Chips
Conical Flask
Hydrochloric Acid
Gas Syringe
Delivery Tube
Stop Watch

Fair Test

To make the experiment a fair test I will use the same amount of acid
for each concentration. I will do this by using a capillary tube
because they are very accurate. I will use 3g of marble in each
concentration of acid. I will clean everything out before I start the
next experiment with a different experiment.


Magnesium is flamable and when it reacts with acid an exothermic
reaction takes place releasing a large amount of heat energy. Acids
are corosive so saftey glasses must be worn.


I will use Marble chips all of a small size. I have decided to use 3g
or marble chips. The amount of acid I have decided on is 20ml. I will
measure this by using a burette, a very thin tube that lets out the
acid when you turn the tap; it gets very accurate amounts of acid. I
can measure the speed of the reaction by how much gas is given off. I
can measure this in cm3 in a gas syringe. When the experiment takes
place, I will take the reading every 10 second to get a good graph for
the results. If the reaction goes very quickly, I will take the
readings every five seconds. I will use acid of 0.5, 1, 1.5, 2 and 2.5
molar concentrations. To be sure I can rely on my results I will
repeat he experiment twice or three times if necessary, because there
is chance of inaccurate results for many reasons.

Calcium Carbonate + Hydrochloric acid Calcium Chloride + Water +
Carbon Dioxide

CaCO3 + 2HCl CaCl2 + H2O + CO2


I predict that if the concentration of the Hydrochloric acid is
doubled then the experiment will happen twice as fast. This is because
twice as many HCl particles will be present than previously, and there
will be twice as much chance of the calcium carbonate chips colliding
with the concentrated hydrochloric acid. Therefore, when the
concentration is double, the time taken for the reaction should be
halved. When the surface area of the calcium carbonate chips is
doubled there will be twice as much chance of it colliding with the
Hydrochloric acid. Therefore I predict that when the surface area is
doubled, the time taken for the experiment is halved. A temperature
increase of 10 C will see the time taken for the experiment halved
because energy of collisions in the particles increases, this means
that there are going to be more successful collisions.


A reaction occurs when particles collide. This process is based on
random particle movement. So therefore, the more particles you have in
a space, the more likely they are to collide. Therefore making the
reaction accelerate. This theory can be proved if you compare the
rates of reaction with marble in hydrochloric acid. 'If the acid is of
a higher concentration, the reaction will be quicker. Also if the
particles have...

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