# Rates of Reaction Experiment

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Rates of Reaction Experiment

Rate of reaction means the rate of formation of a

product/disappearance of a reactant, this is useful because we can

time the different concentrations reacting with the acid, and give

each of them a rate, based on the formula rate = 1/time.

Rate of reaction is what we use to measure how quickly a reaction

takes to reach a certain point in the reaction in this case it is when

it gets to certain cloudiness. In this investigation, we will need to

measure the time of the reaction, so we can make a rate for it, to do

this we use the formula, - rate = 1/time * 1000, we use the *1000 so

that it is a manageable number to plot on a graph if necessary. It is

generally measured in time, as this is the only means possible to us;

however you must be careful because as heat is a catalyst, it strongly

affects the rate as you will see in the results, so we have to try and

keep it the same throughout the experiment. The reaction we are

studying is very easy to monitor and time. All of the products in the

solution dissolve into it (sodium chloride, sulphur dioxide and

water), apart from sulphur, which makes the solution go cloudy, and

forms a precipitate.

This can be written down as s-1for example 15.7 s-1means 15.7 per

second is the rate of the reaction.

The rate is generally measured by selecting a certain amount of two

substances, and finding a suitable way of judging when the reaction

has finished, the reaction is then timed, and when you have a time,

you put it into the formula rate = 1/time *1000.This is the only

method available to us, because it can not be done any other way for

this experiment, but others may be measured in different ways, i.e.

mass loss, or amount of gas evolved could be measured.

The Equations for this experiment are:

Sodium thiosulphate + Hydrochloric acid à Sodium chloride + sulphur +