Sodium Thiosulphate Essay, Research Paper
In this investigation I will change the concentration
of the sodium thiosulphate by adding water in each case to make it more dilute
but when adding the water it must bring the volume up to 10cm? everytime to make it a fair test.?????????????????????????? ?????????????????????????????????????????????????????????????????????????????????????????????????????????????????????????????????????????????????????????????????????????????????????????????????????????????????????????????????????????????????????????????????????????????????????????????????????????????????????????????????Dependant
variable.?????????????????????????????????????????????????????????????????????????????
I will measure the time taken for the cross to disappear,as it will show
whether the rate of reaction has increased or decreased. The rate of reaction
has increased if the time has decreased as the reaction has occurred alot
quicker so therefore the time taken is alot less.The rate of reaction has
decreased if the time has increased as the reaction is alot slower and
therefore the time taken is alot longer.???????????????????????????????????????????????????????????????????????????????????????????????????????????????????????????????????????????????????????????????????????????????????????????????????
??????????????????????????????????????????????????????????????????????????????????????????????????????????????????????????????????????????????????????????????????????????????????????????????????????Controlled
variables.????????????????????????????????????
?????????????????????????????????????I will keep: the
same volume of hydrochloric acid.????????????????????????????????????????????????????????????????????????????????????????????????????????????????????????????????????????????????????????????????????????
????????????????????????????????????????????????????????the same
reaction volume(total volume 20 cm ).?????????????????????????????????????????????????????????????????????????????????????????????????????????????????????????????????????????????????????????
???????????????????????????????????????????????????????the same
size of the cross.?????????????????????????????????????????????????????????????????????????????????????????????????????????????????????????????????????????????????????????????????????????????
??????????????????????????????????????????????????????the same size
conical flask.?????????????????????????????????????????????????????????????????????????????????????????????????????????????????????????????????????????????????????????????????????????????
?????????????????????????????????????????????????????the same
amount of swirling of the solution.??????????????????????????????????????????????????????????????????????????????????????????????????????????????????????????????????????????????????????????????
????????????????????????????????????????????also the same peron
will be timing the stopwatch.??????????????????????????????????????????????????????????????????????????????????????????????????????????????????????????????????????????????????????????????????
????????????????????????????????????????????and the same person
will be judging how long it takes??????????????????????????????????????????????????????????????????????????????????????????????????????????????????????????????????????????????????????????????
????????????????????????????????????????????for the cross to become
invisible.?????????????????????????????????????????????????????????????????????????????????????????????????????????????????????????????????????????????????????????????????????????????????
????The controlled variables are
to make the experiment a fair test.???????????????????????????????????????????????????????????????????????????????????????????????????????????????????????????
Note:The total volume is always the same,water must be added??? ?????????????????????????????????????????????????????????????????????????????????????????????????????????????????????????????????????????????????????????????????????????????????????????????????????????to
the solution to bring it up to 20 cm .????????????? ?????????????????????????????????????????????????