Determine the rate of reaction with respect to I-

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SUMMARY

The discussion focuses on determining the rate of reaction with respect to iodide ions (I-) and thiosulfate ions (S2O3^2-) in a chemical reaction. The experiments conducted utilized 0.200M KI, 0.020M Na2S2O3, and 0.40M H2O2 among other reagents. The recorded times for the reactions varied significantly, indicating a strong dependence on the concentrations of the reactants. The rate equation established is rateI = -Δ[S2O3^2-]/time, which allows for the calculation of the concentration of S2O3^2- based on the known quantities and volumes of the reactants.

PREREQUISITES
  • Understanding of reaction kinetics and rate laws
  • Familiarity with molarity and concentration calculations
  • Knowledge of stoichiometry in chemical reactions
  • Basic laboratory skills for conducting experiments
NEXT STEPS
  • Calculate the initial concentration of S2O3^2- using the provided experimental data
  • Explore the impact of varying concentrations of KI and Na2S2O3 on reaction rates
  • Learn about the use of buffers in chemical reactions, specifically acetate buffers
  • Investigate the role of starch as an indicator in redox reactions
USEFUL FOR

Chemistry students, laboratory technicians, and educators involved in teaching reaction kinetics and stoichiometry will benefit from this discussion.

blicker
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Homework Statement


-------Solution1:-----Solution2:-----Solution3:---------- Solution4:-----Solution5:--------------- Solution6:
Exp. 0.200M KI-----2% starch-----0.020M Na2S2O3 -----water----0.050M acetate buffer -----0.40M H2O2


1-----2.00mL ----- 1mL --------- 1.00mL ---------------5mL --------- 10mL ------------------ 1.00mL
2-----4.00mL ----- 1mL --------- 1.00mL ---------------3mL --------- 10mL ------------------ 1.00mL
3-----2.00mL ----- 1mL ---------1.00mL ----------- ---4mL --------- 10mL --------- --------- 2.00mL

there were 3 experients and these were the recorded times:

Ex.1 Trail1=166s
Trial2=149s

Ex. 2 Trail1=48s
Trail2=55s

Ex.3 Trail1=5s
Trail2=8s

Homework Equations


The information I am given says that I- and S2O3^2- react in a 1:1 ratio resulting in Δ[I-]=ΔS2O3^2-]. How do i find the concentration of S2O3^2- when its not given? its not listed in the concentrations above, so do i have to calculate it from one of the concentrations and experiments above? if so, how would i do that?


The Attempt at a Solution


I know rateI=-Δ[S2O3^2-]/time
 
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You know how much substance is present, you know total volume of the solution, you know everything you need to calculate the initial concentration. When everything is given, it is as if you were given the concentration itself.