Highschool Lab

[highschool boy]

Hi guys

I have a grade 12 highschool lab tomorrow and i dont understand one of the questions

The question is as follows:

The balanced chemical equation for the reaction is as follows:

2KMnO4+ 5H2C2O4+ 3H2SO4 ----> K2SO4+ 2MnSO4 + 8H2O+ 10CO2

Account for the different rate when the second portion of potassium permanganate solution was added to test tube #1. (Look at the products carefully for a clue).

 

(Test tube 1 is a repeated version of another test tube experiment which consisted of 5 ml of oxalic acid, 10 ml of sulphuric acid 10 ml of tap water, room temperature and 2 ml of KMnO4. The difference between both is that the repeated version took 74s to react and the first version took 180s to react.)

Thanks!

[hypervalent_iodine]

We won't give answers to homework questions, you'll need to state what is confusing you specifically so we have something to build off. You've not really provided enough information for us to give you any definitive help. What were the amounts of each reagent you added to your second test tube (you only specified for one)?

 

If it's what I think it is, then you need to ask yourself what you know about initial reaction rates - i.e. what factors affect the initial rate by which a reaction occurs? You should have a look at the associated equations for calculating rates for an idea, if you're still stuck.