dertermining the rate equation

Title:determination of the rate equation
Task:Plan design and conduct an experiment to determine the rate equation for the reaction between Sodium Thiosulphate Na2S2O3 and Hydrochloric Acid HCl
2HCl(aq)+Na2S2O3(aq) 2NaCl (aq)+SO2(g)+S(s)+H2O(l)
0.4 mol dm-3 Sodium Thiosulphate Na2S2O3
10cm3, 25cm3, 50cm3 measuring cylinder
1. Measure out 50cm3 of sodium Thiosulphate using the 50cm3 measuring cylinder
2. Pour this into the 100ml conical Flask
3. The conical Flask should be placed on the paper with the x marked clearly on it.
5. add this to 22.5cm3 of distilled water
6. add this dilute mixture of HCl to the sodium Thiosulphate
8. record how long it takes for the cross to disappear
9. carry out the experiment again for the volumes mentioned in the table below
(x) Initial Volume of water/ cm3 Initial Concentration of Dilute HCl/ Moles dm-3 Time taken/ Seconds Relative Initial Rate 1/t
0 25 x/ total volume * number of concentrations
The concentrations that I have chosen to do vary from those that were done in the experiment because I wanted to see what would happen if I doubled the concentration of HCl and reduced the volume of water used, what affect it would have on the rate.
In theory as initial concentration of HCl doubles or quadruples the initial rate should also double or quadruple.The volumes that I have chosen are shown above in the table.The amount of HCl and distilled water used always equals 50cm3 in total as it did in the demonstration.
I have chosen o choose eleven different co

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