An investigation of the affect of the concentration an of the rate of

An investigation of the affect of the concentration an of the rate of

reaction.

Introduction.

We are trying to find out the affect of acid concentration on the rate

of reaction, we are using 2, 1.5, 1, 0.5, 0.25 Molar acid. In our

experiment, we are reacting it with sodium thiosulphate. The collision

theory will be involved in this, for instance the more concentrated

the acid we use, the faster the reaction will occur and the lower the

concentration the slower the reaction will occur, this is because the

collision theory says that if something is more concentrated then it

will collide more because there will be more of the substance. We

could use a catalyst to speed up the reaction, this allows the

molecules to move around easier to help them to collide more to speed

up the reaction for instance say that people are trying to get over

wall it is possible but it will take a slow process and say that we

add a catalyst, our catalyst is a ladder this enables the people

(molecules) to get over the wall quicker and easier than they normally

would. In this experiment we need to control the amount of acid,

amount of water, chemicalswater temperature amount of sodium

thiosulphate and to all agree when the x is gone on the paper. We need

to be safe when doing this by wearing goggles and making sure that we

dispose of the end result chemical in a large beaker in the fume

cupboard and not down the sink, we also need to make sure we do not

lean over the conical flask when we perform the experiment because the

chemical fumes are pungent and are not good to breath in.

Method.

We are going to measure the rate of reaction by how fast or slowly the

mix of chemicals and water goes cloudy by placing a piece of paper

with a cross on it underneath the conical flask and all agreeing when

it has disappeared from sight.

In this experiment we will need to use the following:

Equipment Use

Stop clock

To time the experiment

Conical flask

To collect all the chemicals together in

Burette

To measure accurately all the chemical and water

Sodium thiosulphate

Chemical used in this experiment

Hydrochloric acid

Chemical used in this experiment, we will use 2, 1.5, 1, 0.5 and 0.25

molar strengths

Water

Used in this experiment, used in dilutions

Paper

Used along with cross of colour to determine when mixture is cloudy

enough

Beakers

Used to hold the chemicals and water

Dilutions

To obtain the different strengths of hydrochloric acid we will need to

dilute 2 molar acids and dilute it with water to reach the appropriate