Rate Of Reaction Between Hydrochloric Acid And Calcium Carbonate

2874 words - 11 pages

Rate of reaction between Hydrochloric Acid and Calcium Carbonate

Calcium carbonate reacts with hydrochloric acid to form carbon dioxide
gas. One way of following the rate of reaction at which it reacts is
to measure the volume of carbon dioxide produced at certain time
intervals during the reaction.

CaCO + 2HCl CaCl + H O + CO
===========================

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

Equipment
---------

Delivery tube
Conical flask
Hydrochloric acid
Calcium carbonate chips
Burette
Beaker
Electric scales
Measuring cylinder
Tub
Water
Electric timer
Goggles

Retort stand

The different factors that can affect my experiment are the
temperature, the concentration of my reactants and the surface area,
also adding a catalyst. We have decided to test different
concentrations of hydrochloric acid for our experiment because it will
give us sufficient results to make our evidence reliable.

RATE OF REACTION BETWEEN

HYDROCHLORIC ACID AND CALCIUM CARBONATE

LOW CONCENTRATION

HIGH CONCENTRATION

I think that during our experiment, the higher the molarity of acid
the quicker the rate of reaction will be, I think this because of the
collision theory. If the solution is made more concentrated, there
will be more particles in the solution. This makes collisions between
important molecules more likely and will collide more often. At the
beginning of the reaction, there are lots of reactants particles (and
no products). This means a lot of productive collisions between
reactants. As time goes on these reactants will become less and less
(because reactants have been turned into products), therefore less
collisions, so the rate of reaction will slow down. If the molarity of
the acid concentration is doubled, the rate of reaction will double.
This is because the particles are closer together in a concentrated
solution. Therefore, because they are closer the particles will
collide more often. The more often they collide the more chance they
have of producing a productive reaction. If I had a wide range of
molarities, it would be easy to see this pattern.

METHOD

Before conducting our experiment where we would get our facts and
evidence from, we carried out a pre-test. The pre-test helped us
decide the exact details of our experiment. We started off with
testing 25cm³ of 3-molar hydrochloric acid to 2g of calcium carbonate
medium size chips (we decided a medium size chips before we started
our pre-test as we had a choice of 3, small, medium, large). We saw
that this reacted too quickly as we used 10 second intervals and we
couldn't get 6 results this is because our burette could only hold
100cm³ of water, which would make our results reliable. We then
decreased the amount of Calcium Carbonate to 1g and kept the same
25cm³ of 3 molar hydrochloric acid and 10 second intervals. We could
get the right amount of results of this, so we then tested the other
extreme - the lowest molarity. We tested both the highest and...

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