Rate of Reaction Between Marble Chips and Hydrochloric Acid

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Rate of Reaction Between Marble Chips and Hydrochloric Acid

The aim of this experiment is to find out how different variables

affect the rate at which the reaction between Marble chips (CaCO ) and

Hydrochloric acid (HCl) takes place. There are many variables that

affect the rate of this reaction such as the following:

1. Temperature

2. Concentration (Pressure for gases)

3. Catalyst

4. Surface area

In my investigation I will be testing how changing the concentration

of the Hydrochloric acid. The aim is to find out if changing the

concentration of the hydrochloric acid solution has an effect on the

time taken for the reaction. The reaction that will take place is:

Hydrochloric acid + Calcium Carbonate à Calcium Chloride + Water +

Carbon dioxide

2HCl (aq) + CaCo3 (s) Ã CaCL2 (aq) + H2O + CO2 (g)

Collision theory - Collisions between reactant particles are needed

for the reaction to take place in order to form a product. Some

collisions are successful and give a product while others don't

because particles don't have enough energy.

Activation energy - The amount of energy needed for the reaction to be

started. If there is enough energy then the reaction takes place and a

product is formed, but if there isn't enough then no reaction takes


There are two possibilities for increasing the rate of reaction:

1. The activation energy is reduced so that there is a better chance

of particles having enough energy to react. Reactants will need less

energy to react.

2. The number and strength of collisions is increased so that the

reaction can

happen faster. If the particles have more energy then more particles

will be able to react.

Solid reactants like marble chips are effected by surface area, the

larger the surface area the more collisions that will take place. This

will increase the rate of reaction and decrease the time taken.

Liquid/ Aqueous reactants rely on collisions for more collisions to

take place.

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