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How can i measure the rate of reaction between different concentration of Sodium thiosulphate and hcl? A way that can avoid human error and inaccuracy?

Thanks
use a robot too measure it


just use a stopwatch and measure it
Reply 2
Avatar for stephen_1990
stephen_1990
OP
robot ? How? Measure the what?
Use the stopwatch to measure what time?
stephen_1990
How can i measure the rate of reaction between different concentration of Sodium thiosulphate and hcl? A way that can avoid human error and inaccuracy?

Thanks


use a photocell on one side of the test tube and a lamp on the other, measure the current put out by the photocell until it reaches a certain predetermined level...
Reply 4
Avatar for steve2005
steve2005
17
stephen_1990
How can i measure the rate of reaction between different concentration of Sodium thiosulphate and hcl? A way that can avoid human error and inaccuracy?

Thanks


You could use a photoelectric cell ( Photometer) but most schools will expect you to watch the cross disappear using your eyes.

Have you seen this site.
http://www.wpbschoolhouse.btinternet.co.uk/page03/3_31rates.htm

http://www.sis-germany.com/download/doa.pdf
Reply 5
Avatar for Jonquil
Jonquil
10
The method when you watch the cross disappear through the liquid is the easiest way but quite inaccurate as it relies on you judging when the cross has disappeared and you have to stop the timer at exactly the right time. Btw, this experiment really stinks because of the sulphur! Do you have to do this exact experiment?
Reply 6
Avatar for stephen_1990
stephen_1990
OP
yes i think so
Reply 7
Avatar for stephen_1990
stephen_1990
OP
Jonquil1
this experiment really stinks because of the sulphur!


can you pls explain the reason?
Reply 8
Avatar for carol05
carol05
stephen_1990
can you pls explain the reason?


Sulphur dioxide gas is produced and it smells.
2HCl(aq) + Na2SsO3(aq)= 2NaCl(aq) + S(s) + SO2(g) + H2O(l)
Can you put a cross on a piece of paper, put it underneith the beaker and use a data logger, when the cross dissapears the data logger records the duration it took.
Reply 10
Avatar for stephen_1990
stephen_1990
OP
i dident smell that...

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