Rates of reaction experiment SPA

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Discussion Overview

The discussion revolves around an experiment conducted during O levels involving the reaction between acidified potassium iodide (KI) and hydrogen peroxide. Participants are addressing the importance of documenting specific volumes of reactants and the total volume of the solution in relation to calculating concentrations.

Discussion Character

  • Homework-related

Main Points Raised

  • One participant questions the necessity of labeling the volume of distilled water in their tabulation, noting they included other relevant volumes and timings.
  • Another participant emphasizes the need to know the total volume to calculate concentrations accurately.
  • A different participant clarifies that providing the total volume of distilled water along with reactants is sufficient for the experiment's requirements.
  • One participant suggests that recording the volume of water added for dilution and the final volume is equivalent, assuming all reagent volumes were recorded correctly.

Areas of Agreement / Disagreement

The discussion reflects some agreement on the sufficiency of recording total volumes, but there remains uncertainty regarding the specific importance of labeling the volume of distilled water separately.

sgstudent
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Hi today I took my O levels spa and the reaction was acidified KI+hydrogen peroxide. Once we see a slight colouration, we stopped timing the stopwatch. We were told to draw a tabulation box with the information in the experiment. Also we were told to clearly show the total volume of the solution before the additional if the second reactant (we diluted one of the reactants). However, I didn't put a heading as "volume of distilled water". Is that very important to write that down? I had only put volume of H2O2/cm3, volume of solution before KI was added/cm3, volume of KI/cm3 and time taken for blue colouration to appear/s. Thanks for the help!
 
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You need to know total volume to be able to calculate concentrations.
 
Hi Borek I did give the total volume of distilled water+reactants so that good enough?
 
If I understand you correctly, it doesn't matter - recording volume of water added for dilution and final volume is equivalent (assuming you correctly recorded volumes of all reagents).
 

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