Investigating Rates of Reaction

Investigating Rates of Reaction

A reaction is when the particles from two substances react together to

form or give off a new substance. The rate of reaction is how fast or

how slow a reaction goes.

Plan

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For this investigation, I am going to investigate how concentration

affects the rate of a reaction. To do this I am going to use marble

chips (CaCO3 ) and Hydrochloric acid (HC1) along with water (H2O) and

record how long it takes for the marble chips to react with several

concentrations of acid, after a certain length of time.

The one thing that I am going to change throughout my experiment is

the concentration. I predict that if I increase the concentration (so

that there is a greater percentage of acid) the faster the reaction

will be; My reason is because there will be more particles of acid, in

the same volume, colliding with the marble chip particles and the more

collisions the faster a reaction is. If I decrease the concentration

then the reaction time would be much slower as there are fewer

particles in the same concentration, meaning fewer collisions between

the acid and the marble chips. If I were to double the concentration

then I predict that the reaction time would halve as there would be

double the amount of acid particles colliding with the marble chip

particles, decreasing the length of time they would take to react.

A solution that is more concentrated has more acid particles in the

same volume as one, which has less particles, so therefore is less

concentrated. If there are more acid particles then it increases the

chance of them colliding into the marble particles so the rate of

reaction will be much quicker.

Equipment used to carry out the experiment:

Glass measuring cylinder Clamp stand

Gasses produced Measuring cylinder

Washing bowl Stop clock

Water 3 decimal place balance

Conical flask

Marble chips

Solution

To do this test, first you have to set up all your equipment and use a