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Thread: Coca Cola and Milk - chemical reaction?

  1. #1 Coca Cola and Milk - chemical reaction? 
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    Is this really true?
    Has anyone tried it?



    The reaction of phosphoric acid (V) to proteins in the milk - they are cut and causes a precipitate
    The reaction of phosphoric acid with calcium contained in milk gives rise to a precipitate
    3Ca + 2H3PO4 ///\\\ Ca3(PO4)2 + 3H2

    It is a reaction of the Phosphoric Acid contained in the coca cola to the milk. Phosphoric Acid molecules attach to the milk giving them more density and separate out while the remaining liquid that makes up the milk and cocoa cola now being lighter floats on top. The solid matter is basically milk that has been curdled by the addition of the more acidic soda.

    Both items are acidic but coca-cola more so. In general, coca-cola has a pH of anywhere from 2.5-4.5 because of the Phosphoric Acid content where milk has a normal pH around 6.7 (almost neutral, milk that is in the base range is usually mastitic).

    There are some studies to suggest that because of the high Phosphoric Acid content in most soft drinks that they can help to increase the likelihood that a person will develop Osteoporosis if they aren't getting enough Calcium in their diet. Coca-cola makes an excellent household cleaner - it can be used to take tarnish off of pennies and I've used it to degrease car engines. I will not drink any soft drinks.
    Source:
    Coke mixed with Milk experiment - YouTube


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  3. #2  
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    nothing wrong with that.


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  4. #3  
    exchemist
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    Quote Originally Posted by anri1 View Post
    Is this really true?
    Has anyone tried it?
    The reaction of phosphoric acid (V) to proteins in the milk - they are cut and causes a precipitate
    The reaction of phosphoric acid with calcium contained in milk gives rise to a precipitate
    3Ca + 2H3PO4 ///\\\ Ca3(PO4)2 + 3H2

    It is a reaction of the Phosphoric Acid contained in the coca cola to the milk. Phosphoric Acid molecules attach to the milk giving them more density and separate out while the remaining liquid that makes up the milk and cocoa cola now being lighter floats on top. The solid matter is basically milk that has been curdled by the addition of the more acidic soda.

    Both items are acidic but coca-cola more so. In general, coca-cola has a pH of anywhere from 2.5-4.5 because of the Phosphoric Acid content where milk has a normal pH around 6.7 (almost neutral, milk that is in the base range is usually mastitic).

    There are some studies to suggest that because of the high Phosphoric Acid content in most soft drinks that they can help to increase the likelihood that a person will develop Osteoporosis if they aren't getting enough Calcium in their diet. Coca-cola makes an excellent household cleaner - it can be used to take tarnish off of pennies and I've used it to degrease car engines. I will not drink any soft drinks.
    Source:
    Coke mixed with Milk experiment - YouTube
    You do realise the pH of your stomach acid is about 2, do you?
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  5. #4  
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    Quote Originally Posted by exchemist View Post

    You do realise the pH of your stomach acid is about 2, do you?
    Seconded. Your 2.5-4.5 is a little too wide ranged :P
    I can never know I'm right, but I can know that I'm wrong.
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  6. #5  
    Forum Professor astromark's Avatar
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    So 'Coka~Cola' can separate out fatty acids.. milk fats.. Have you ever tried the 'Menthose' into the bottle.. Do it outside a...
    Are you sure you are drinking clean water.. ? I would not be too worried about milk and coke.. " Burp !"
    ~ Have you noticed that Coka~cola is cheaper than bottled water ? at the local super market..
    Last edited by astromark; July 1st, 2014 at 03:36 PM.
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  7. #6  
    Brassica oleracea Strange's Avatar
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    There is an apparent correlation (*) between consumption of cola-type drinks and osteoporosis. (But I assume that video is crap. Yes, without bothering to look; but why would I: it's a video, ffs. What is wrong with people.)

    Osteoporosis & Sodas (Soft Drinks): Phosphoric Acid and Other Causes
    Colas, but not other carbonated beverages, ar... [Am J Clin Nutr. 2006] - PubMed - NCBI

    (*) Repeat after me: correlation is not causation. The importance of phosphoric acid, caffeine and any other ingredients is not clear. The mechanism is not clear.
    Without wishing to overstate my case, everything in the observable universe definitely has its origins in Northamptonshire -- Alan Moore
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  8. #7  
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    You have used Coca Cola to degrease car engines?

    I can't see a mechanism for that. Can anyone else?
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  9. #8  
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    Quote Originally Posted by Warron View Post
    You have used Coca Cola to degrease car engines?

    I can't see a mechanism for that. Can anyone else?
    Good point and no, neither can I. Coca Cola has no surfactant properties, so far as I know.

    I gather that phosphoric acid is sometimes used to arrest the rusting of iron, by formation of a protective layer of phosphate, I think, but I'm sure it would need to be a hell of lot stronger than anything in Coca Cola.

    Urban myth?
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  10. #9  
    Forum Professor astromark's Avatar
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    I would not want a sugar rich substance all over my auto engine.. can I plug WD40 or other purpose blended mixtures...

    Your education is not compleat if you are not watching 'Myth-busters' with a tilt to the humorous side.

    and that " There are Ants all over the car.." Paints a ugly image for me..

    ~ Self imposed Rule; Do not do science 'via u tube' ..
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  11. #10  
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    The acidity of the coca cola solution will denature the milk's proteins. Giving the milk a sour taste, much like a milk passed its expiration date, were the milk's proteins become denatured due to the decrease in pH level caused I believe by microbial organisms.

    It may be bad for your health.. potentially.
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  12. #11  
    Cooking Something Good MacGyver1968's Avatar
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    Quote Originally Posted by exchemist View Post
    Quote Originally Posted by Warron View Post
    You have used Coca Cola to degrease car engines?

    I can't see a mechanism for that. Can anyone else?
    Good point and no, neither can I. Coca Cola has no surfactant properties, so far as I know.

    I gather that phosphoric acid is sometimes used to arrest the rusting of iron, by formation of a protective layer of phosphate, I think, but I'm sure it would need to be a hell of lot stronger than anything in Coca Cola.

    Urban myth?
    I've never heard of it being used as a degreaser...but I have heard of it being used to remove the white chalky residue on battery terminals.
    Fixin' shit that ain't broke.
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  13. #12  
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    In South Africa we call that drink a brown cow and it is delicious
    As is often the case with technical subjects we are presented with an unfortunate choice: an explanation that is accurate but incomprehensible, or comprehensible but wrong.
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  14. #13  
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    Carbonated beverages are frequently used to degrease the grills in fast food restaurants. Most likely the carbonation rather than the acid is the factor at work in degreasing.
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