1.Describe the procedure of an experiment on how you can study the effect of temperature on the rate of the reaction between sodium thiosulphate and dilute hydrochloric acid.
- Gabriella MontezLv 71 decade agoFavorite Answer
Based on S2O32- + 2H+ ---> SO2 + H2O + S
1) Prepare a water bath at 20oC and and place a beaker in it.
2) Draw a black cross on a cardboard and place it underneath the beaker.
3) Mix sodium thiosulphate and dilute hydrochloric acid in the beaker and start the stopwatch.
4) Record the time ( t s ) required for the black cross to disappear.
5) Repeat the experiment for higher temperatures, say 30oC, 40oC, 50oC, 60oC and so on.
6) Obtain at least 5 sets of data and plot a graph of ( 1 / t ) against temperature.
* A graph with positive slope will be obtained and this shows that the higher the temperature, the faster the reaction rate.
2009-04-20 15:23:23 補充：
For each trial, the conc. of both reactants are kept constant and a fixed volume of sodium thiosulphate is added to excess HCl.Source(s): My Chem Knowledge