Chemistry notes my assignment

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So, my experiment that I done is finding out how much iron is in iron tablets. I live in Norway and I bought 5 different types of iron tablets here (I will attach the photos of the company and its ingredients). I got all the equipment’s ready and I then grinded 5 iron tablets with a mortar and pestle. And for each set of 5 iron tablets, I was cleaning the mortar and pestle with distilled water just in case. I had 5 different volumetric flasks filled with 25 ml sulphuric acid and rest is filled the distilled water until the white mark on the volumetric acid. For each volumetric flask I put one type of iron tablets into it and mixed it and shacked it. After I finished mixing them, I noticed that some were forming weirdly and started going into little balls of iron powder that is formed together (you will see from the photos). So, I took the most sensible looking one and it’s the pink one which was 65mg (ferromax), and I titrated is with potassium permanganate ( you will see the photo), and first took a trial and then carried the experiment for 5 times and got nearly perfect results (I will take a photo of my table and you can see). After I done the first experiment, I move to the next one which was duroferon 100mg. I do my trial and It took me around 64 ml or potassium permanganate to turn it from a light lemony yellow to a dark red kind (I could of put more permanganate but it would have been a waste you know). The colour never went to clear and then clear pink as it’s supposed to, it just went to a close colour to burgundy which I found weird and so did my teacher find weird. And then I carried out the experiment for the rest (Nifrex 100mg, Nycoplus Ferro-Retard 100mg and Hemofer 2 tablet are 27mg iron mixed with vitamin C and something got to do with haemoglobin from cow) and found the same results for them, but with some I carried on with using more permanganate to see if it would change if I add extra but the results were only the liquid going light then dark again which still didn’t make sense to me even for the 27 mg one.

So, I thought the only way I could do this if I wait until next day and leave the volumetric try get dissolved and maybe try that way. So next day comes I set up my equipment again and I get the volumetric from next door and I try the experiment. But I made a huge mistake by thinking shaking the solution would speed up the process of the iron balls or clumps or whatever you want to call it and the small bits that was stuck to the volumetric glass (will be seen from photo). After I shacked it, I noticed that it was wrong, so I had to come up with another plan to save my experiment. So, I tried to filter each of the 4 volumetric flasks into its sperate beakers hoping the process would be saved and purified but unfortunately same kind of results were given where no concordant results were given of – +2 and there was no end point of colour change.

I felt really disappointed with myself because this means all my 25 percent of final exam is gone, but my teacher said if you write it in detail and very good where you show different data graphs and what so will improve your points so much.

Compare and tract with theoretical, what I was expecting, explain in detail what went wrong and how can I improve, why they went wrong.. a good research question obviously

but I will send you examples and criterions that you should follow, and please try your best on this, I know you have a lot of other work. Please add more valid points on what you think would get me good marks

I sent an email to my teacher saying can I make up some data for the results that I didn’t get a chance to do and he said this:

You cannot make anything up in your practical at all. You can only talk about what you did.
You can then talk about the errors you made – why you made them and also what were the expected results based on the calculations I helped you with. ( I will place those calculations for you)
Your advantages are this
Lots of errors – you gain marks by describing them evaluating them and explain how to eliminate them.
The only thing I will say is this.
I was of the understanding you at Christmas had made arrangements to get a variety of different tablets from the UK with different concentrations and amounts of iron in the tablets. The ones you used appeared to be Norwegian – the standard strength is 100mg iron which you had in 3 of your 5 tablets.
The examiner may ask why you chose 3 of the same concentration.
The ferromax worked perfectly
The one made of the animal blood must gave containing some aggregate chemical – makes the blood clump together.
As the amount of iron in them was so low, you didn’t need that much permanganate

Thanks