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What is the rate equation of the reaction between sodium thiosulphate and hydrochloric acid?

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  • Essay length: 1066 words
  • Submitted: 13/04/2009
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International Baccalaureate Chemistry

The first 200 words of this essay...

What is the rate equation of the reaction between sodium thiosulphate and hydrochloric acid?

Overview

Sodium thiosulphate and hydrochloric acid react according to the stoichiometric equation:

Na2S2O3 (aq) + 2HCl (aq) 2NaCl (aq) + H2O (l) + SO2 (aq) + S(s)

The balanced equation, however, does not tell us how the reactants become products. A rate law or rate equation, however, can. The purpose of this experiment is to determine the rate equation for the reaction between sodium thiosulphate and hydrochloric acid by determining the order of reaction with respect to sodium thiosulphate and hydrochloric acid. The order of reaction for each reactant is, in this case, determined by varying the concentrations of each reactant in turn while keeping the others constant.

Data Collection and Processing]

Raw Data Table

Trial One

Volume of Na2S2O3 /cm3

Volume of water /cm3

Volume of HCl /cm3

Time /s

50

0

10

49.7

40

10

10

64.6

30

20

10

95.0

15

35

10

222.2

5

45

10

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