Investigating the Effects of Concentration on the Rate of Reaction

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Investigating the Effects of Concentration on the Rate of Reaction

Chemistry Coursework

Aim: To investigate the effect of concentration on the rate of

reaction between magnesium and hydrochloric acid.

Introduction:

This investigation is done to find out the rate of reaction between

the two substances. I will be changing the concentration of the

hydrochloric acid and adding the same amount of magnesium to each

beaker. As I change the amount of hydrochloric acid, I would be

diluting water with it. Each beaker will have 100 ml of liquid. The

water weakens the acid, giving it a lower pH value, which will affect

the rate of reaction. When I place a magnesium strip in the solution,

I will time it till the magnesium strip is not seen.

This would mean that the magnesium has reacted with the hydrochloric

acid.

The word equation for this investigation is:

Hydrochloric acid+ magnesiumà magnesium chloride+ hydrogen

2HCl + Mg à MgCl2 + H²

Concentration: how dilute the acid is.

The rate of reaction: amount of reactant used up for each unit of

time.

Prediction:

I predict that as the concentration of the hydrochloric acid decreases

the rate of reaction decreases. I think this because the more the acid

the faster the reaction goes as the acid is stronger, which causes

more pressure. Pressure increases as there are more collisions within

the container, with the particles. The more the water added the less

the concentration, so the rate of reaction increases.

I think my graph will look like

ß this.

[IMAGE]

I think my graph will have a negative correlation. The higher the

concentration of hydrochloric acid the faster the rate of reaction.

[IMAGE][IMAGE][IMAGE][IMAGE]

Water particles

[IMAGE][IMAGE]

Magnesium atoms

Acid particles

[IMAGE] [IMAGE]

High concentrated of water High concentrated acid

In dilute acid there few of acid

particles. This means that there is a less

of a chance of an acid particle hitting

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