Total Surface Area and Rate of Reaction

Topics: Chemical reaction, Chemical kinetics, Hydrochloric acid Pages: 4 (1020 words) Published: May 19, 2013
Antacid tablets are used to relieve heartburn and neutralise stomach acid. Planning
Aim
To determine how the surface area of the tablets affects the rate of the reaction. To determine which form of tablets gives the biggest surface area resulting in the fastest reaction rate.

Investigation question:
What is the relationship between the total surface area of the tablets and the rate of the reaction?

Hypothesis:
The rate of reaction will be the fastest when the tablets crushed into powder as there is a bigger total surface area resulting in more effective collisions between particles.

Variables:
Independent variable: Different forms of tablets.
Dependant variable: Time the syringe took to stop moving as the tablets dissolve. Fixed variables:
*External temperature
*volume of HCl
*Temperature –all 3 final runs were done on the same day so whether was not an issue and did not affect the results *Use of catalyst – a catalyst was not used in any of the experiments * Use the same person to observe the reaction because different people have different eyesight Background information relating to the experiment

In this experiment we are looking at one effect that influences the rate of reaction , namely total surface area. The reaction rate (rate of reaction) or speed of reaction for a reactant or product in a particular reaction is defined as how fast or slow a reaction takes place. As the surface area of the reactants increases, the reaction rate increases. This is because increasing the surface area of the reactants results in a higher number of reaction sites. Increasing the number of reaction sites increases the number of total collisions. The greater the frequency of total collisions, the greater the frequency of effective collisions. If the frequency of effective collisions increases, so does the reaction rate. Surface area is one of the factors that increases the rate of reaction. Other factors include: 1. Concentration. As the...
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