Rates of reaction experiment SPA

[sgstudent]

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!

 

[Borek]

You need to know total volume to be able to calculate concentrations.

 

[sgstudent]

Hi Borek I did give the total volume of distilled water+reactants so that good enough?

 

[Borek]

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).

 

[LudusRex]

Hello,

Thank you for sharing your experience with the SPA experiment for your O levels. It sounds like you followed the instructions correctly and were able to obtain a slight colouration in your reaction. It is important to accurately record all the necessary information in an experiment, including the volume of distilled water used. This information can help in calculating the concentration of the solution and can also be useful for future reference. I would suggest going back and adding the heading "volume of distilled water" and including the corresponding values in your tabulation box. This will ensure that your data is complete and accurate. Overall, it seems like you did a good job in conducting the experiment and recording your results. Keep up the good work!