explain why 1000/time is a measure of the rateWatch
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, the formula is:
- 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 must try and keep it the same throughout the experiment. The reaction we are studying is very easy to monitor and time. All the products in the solution dissolve into it (sodium chloride, sulfur dioxide, and water), apart from sulfur, which makes the solution go cloudy and forms a precipitate. This can be written down as s-1.
For example, 15.7 s-1 means 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 time, you put it into the formula rate: = 1/time *1000. This is the only
method available because it cannot 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.
One of the equations for this experiment is:
Sodium Thiosulphate + Hydrochloric acid » Sulphur + Sodium Chloride + Sulphur Dioxide + Water
NA2S2O3 + 2HCL » S + 2NaCl + SO2 + H2O
This is my opinion and I hope it helps.