How Does Surface Area Affect Reaction Speed?

983 WordsFeb 28, 20114 Pages
How does surface area affect reaction speed? The aim of this experiment was to investigate how the surface area affects the rate of a reaction in between calcium carbonate and hydrochloric acid. My hypothesis was that if the surface area to volume ratio of calcium carbonate was increased, then the rate of the reaction will increase because there are more particles that are accessible by the hydrochloric acid, thus more particles that can react with each other. Variables Independent- Surface area of calcium carbonate Dependent- Amount of carbon dioxide produced (cm3) Controls- Amount of calcium carbonate (g) Volume of hydrochloric acid (ml) Same beaker Same concentration of HCl Same temperature of both HCl and…show more content…
The reason why the chips were so slow was because it had a very small surface area to volume ratio. Each granule had a high surface area to volume ratio and each powder had a very high ratio. The reason why the difference between the granules and the powder was not a lot was because each granule was pretty flat, and quite a lot of calcium carbonate molecules were accessible by the hydrochloric acid. If the granules had been less flat, the difference would be higher. The graph of the powder shows how a lot of gas produced in the beginning and then exponentially decayed. This is because less calcium carbonate atoms were present and they the small clumps might have clumped together. Our original method was to use a gas syringe; however a small bit of liquid somehow got into the syringe, making the plunger very hard to move. After waiting 10 minutes, we realized the gas wasn’t able to push the plunger and so we had to change our method quickly. The other method was much more reliable, as in it wouldn’t stop working. One down side to it was that the powder/granules should have been stirred constantly, to ensure them calcium carbonate not clumping together. Also, none of the reactions completed, so we can’t see how much gas is produced during an entire reaction. It is impossible to say whether or not this experiment was reliable because we only did it once. However, this experiment is
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