I am doing my coursework on 'Factors affecting the rate of reaction between sodium thiosulphate and hydrchloric acid'. I chose to vary the concentration of sodium thiosulphate using the paper with a cross that disappears method. For my extension i have to describe another method of measuring the rate of reaction and my teacher suggesting a data logging procedure using a light reciever. I was wondering if you could enlighten me as to the method of using this pricedure with this reaction as i have searched through my school books and the internet extensively and have been unable to find anything relevant. Thankyou(:
The reaction results in the production of sulphur, making the solution cloudy. If you shine a light through the tube of solution and have a light sensor on the other side, this will pick up the drop in light transmission as the solution goes cloudy. There is a special instrument (a colorimeter) which incorporates both a light souirce and a light sensor, and so can do this automatically.