Investigating the Rate of Reaction Between Marble Chips and Acid

Investigating the Rate of Reaction Between Marble Chips and Acid

Introduction

This is a test to demonstrate the reaction rate between marble chips

(CaCO) and hydrochloric acid (HCl). Hopefully we will be able to prove

that the concentration of the acid is directly proportional to the

reaction rate.

Aim

To discover if the concentration of acid is directly proportional to

the rate of reaction, by monitoring the amount of gas given off as the

reaction takes place.

Prediction

We believe that the concentration of the acid will be directly

proportional to the rate of reaction. We believe this due to the

following theory:

[IMAGE]The collision theory: This theory states that for a reaction to

occur the reactant particles need to react with sufficient energy.

This is called Activation energy. This is shown in the below diagram:

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energy activation energy

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reactants

[IMAGE] products

[IMAGE] time

Anything that aids a reaction would have to either give the particles

energy or use a catalyst to decrease the amount of energy needed to

react.

The more reactant particles there are (or the stronger the

concentration) the harder the reaction will occur.

Using the above theory, I predict that the higher molar the acid is,

the more CO2 will be given off. I predict that the following reaction

will occur:

[IMAGE]CaCO3(s) + 2HCl(aq) CaCl2(aq) + H2O + CO2(g)

I also predict that after a certain amount time all the reactants will

run out and only the product will be left, only then will the reaction

end.

Variables

A variable is anything which affects the results of an experiment, for

example, the variable could affect the speed the particles move or the

amount of energy needed in a reaction. For this experiment, there are

many variables we could use.