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    Hi,
    Im half way through my Salters practical investigation, doing the vitamin c investigation theme. My question is, I have made a standard vitamin C solution, will it be oxidised over the weekend even though it is sealed in a volumetric flask - therefore meaning I wont be able to use it on monday?

    Just as a side note, one of the methods I used on friday to determie the standard solution vitamin c concentration was colorimetry. The standard solution had been produced on the thursday. The results I got showed the ascorbic acid (vit c) conc to be way lower than they should have been - suggesting the standard solution had been oxidised ove rnight. So, I made another standard solution up and repeated my experiment and got the same low reading. This leads me to belive that the standard solution wasnt oxidised and it was just dodgy equipment - s should my standard solution made on friday be ok for use on monday??

    thanks
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    (Original post by mchammer)
    Hi,
    Im half way through my Salters practical investigation, doing the vitamin c investigation theme. My question is, I have made a standard vitamin C solution, will it be oxidised over the weekend even though it is sealed in a volumetric flask - therefore meaning I wont be able to use it on monday?

    Just as a side note, one of the methods I used on friday to determie the standard solution vitamin c concentration was colorimetry. The standard solution had been produced on the thursday. The results I got showed the ascorbic acid (vit c) conc to be way lower than they should have been - suggesting the standard solution had been oxidised ove rnight. So, I made another standard solution up and repeated my experiment and got the same low reading. This leads me to belive that the standard solution wasnt oxidised and it was just dodgy equipment - s should my standard solution made on friday be ok for use on monday??

    thanks
    If you titrate the acid on friday, find that concentration. then the next time before you start the experiment, titrate it again, to check the concentration. I suppose it'd change by a little bit, but if it doesn't change by some whole numbers, you can still use it, and just mention this in your write-up
 
 
 
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