Anonymous asked in 科學及數學化學 · 1 decade ago

F.4 Chem(急.....)

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.

1 Answer

  • 1 decade ago
    Favorite 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
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