My aim for this experiment is to find out how concentration affects the rate of reaction, when marble chips reacts with hydrochloric acid.

My aim for this experiment is to find out how concentration affects the rate of reaction, when marble chips reacts with hydrochloric acid.

Mansoor Khan An investigation to see how concentration affects the 1

rate of reaction.

Introduction

My aim for this experiment is to find out how concentration affects

the rate of reaction, when marble chips reacts with hydrochloric acid.

I am going to use calcium carbonate (marble chips) to react with

hydrochloric acid that will produce carbon dioxide gas. The equation

for this reaction is:

Word equation:

Calcium Carbonate + Hydrochloric acid Calcium Chloride + Carbon

Dioxide + Water

Symbol equation:

CaCO 2HCl CaCl CO H O

For my experiment, I will be experimenting on different concentrations

of acid on marble chips. The other variables that I could have chosen

for this particular experiment are:

Temperature- I thought about choosing this variable but was put off by

the difficulty of control the temperature.

Surface area- I have not choose this because I did not like the fact

that there were only three different sizes of marble chips, when I

needed five results, and also it requires quite a long preliminary

experiment to find the right concentration of acid.

Prediction

I predict that if a high concentration of acid is used, the reaction

will be faster and thus resulting in more carbon dioxide being

produced as gas. The weaker the concentration of acid, the slower the

reaction and the less amount of carbon dioxide gas that will be

produced.

The collision theory states that if particles in a solution have

enough energy to break free from their existing bonds to form new

bonds they will, the amount of energy needed to form new bonds is

called the activation energy. So if you increase the amount of

particles in a solution they will be more collisions.

The collision theory also says that if the particles are constantly

moving and colliding with each other, when one particle collides with

another, energy is transferred between these particles and so energy

is constantly gained or lost. The number of collisions with enough

energy greater or equal to the activation energy, determines the rate

of reaction.

I predict that the 2 molar of hydrochloric acid when reacting with

marble chips will produce the most carbon dioxide and in the least

amount of time, because they are more reactants in the solution and

more particles that will collide with the reacting particles. Also

because this is the most concentrated solution that I am experimenting

on there are more reacting particles of colliding about in the

solution this means that the will be more collisions between the

reacting particles which is likely to cause a reaction, these reacting