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Thread: Juice of lemon and its nutrients

  1. #1 Juice of lemon and its nutrients 
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    Hello,

    I am Catapult, probably new member here.

    Hello,

    After searching a few days ago, I found out that lemon has a citric acid that can be used to produce an electricity.

    Now, I want to get the juice of a lemon and put it in a beaker so that I could put the copper strip and zinc strip there.

    But the problem of mine is that I want the color of the juice which is something orange yellowish will turn to a colorless one (I mean in colorless, like a color of a water).

    At the same time, I still want its nutrients to be there, especially the citric acid even though the color has gone.

    Now, I don't know of any machine that will do the above mentioned. But I hope that there is.
    I asked this question in other forum I guess but due to some reasons I never get any answers yet. If it is Ok, pls answer.

    Catapult


    Last edited by Catapult; August 13th, 2011 at 12:44 PM. Reason: Clarified something.
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  3. #2  
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    Some bleach might clear it up. You wouldn't want to drink it after that, but juice with zinc ions probably woudn't be good to drink anyway.


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  4. #3  
    Forum Freshman Spin-1/2-nuclei's Avatar
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    Hello,

    I would not suggest adding sodium hypochlorite (bleach) to a solution containing citric acid.

    The sodium hypochlorite in bleach predominately exists in the form of hypochlorus acid: NaOCl + H20 <-----> HOCl + Na+ + OH-

    HOCl is a strong oxidizer, what it does to remove color is attack conjugated double bonds in flavanoids and other chromophores present in the juice mixture. So in order for this method to work, you'd have to add enough bleach to disrupt all the conjugated systems present in the flavanoid and other chromophore molecules in your juice.

    So, not only is this a dangerous method to remove color from your solution (if you mix bleach with an acid you will get chlorine gas) - it is also problematic because the removal of color is not the ONLY result that you are looking for. Bleach will not only oxidize the double bonds in the conjugated systems leading to loss of color, it will also oxidize the zinc and copper - if they are exposed to it.

    Thus I suggest the following: Because it is safer and won't interfere with the results of your principle experiment.

    At room temp citric acid is as a white solid, so you can recrystalize the citric acid in water - either boiling or cold - to get the anhydrous and monohydrate forms respectively. The solid citric acid will not conduct electricity so you will have to re-dissolve it once you've purified it.
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  5. #4 Clear "Lemon Juice" 
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    You might want to extract the citric acid from the lemon juice if you want it to become clear. An explanation of this is given by How To Extract Citric Acid From Citrus Fruits.
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  6. #5  
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    You can also buy citric acid and add it to your water. It will be colorless.
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