Mash acidification with Coca Cola

Discussion in 'Grain, Hops, Yeast & Water' started by Drunkula, Dec 9, 2018.

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  1. Dec 9, 2018 #1

    Drunkula

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    I've just looked it up and Coke is the same as 17% phosphoric acid. For acidifying the mash on my last brew I had to use 0.15 ml of 60% lactic acid per litre - I could do the same thing with 0.5 ml / litre of coke. That's nothing - would you taste that in a beer? Probably not. Anyone wanna give it a go?

    As a caveat I haven't worked out if the carbonic acid from the fizz would play a factor but I'm sure that would be driven off at mash temperatures.

    Yeah, just whiling away the hours until I don't get scowled at if I start to drink.
     
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  2. Dec 9, 2018 #2

    Ghillie

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    Cool idea! Could be a nice way of imparting some colour in a brew as well @Drunkula.
     
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  3. Dec 9, 2018 #3

    Ghillie

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    @Drunkula, when I first read your post I had visions of me pouring a can into the mash. I ran it through Bru'n Water and I'd need just 20.2ml of coca cola for a mash pH of 5.2 on my flagship IPA! 9ml to acidify my sparge water.

    I really want to try this!
     
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  4. Dec 9, 2018 #4

    MyQul

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    No that's something Ive never heard of. Go for it and report back.
     
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  5. Dec 9, 2018 #5

    Drunkula

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    Excellent. Ok, coke zero is 14.7% apparently. If I find any more things I'll get back. Rah! Coke mash, for when CRS isn't enough.
     
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  6. Dec 9, 2018 #6

    braziliain

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    I think Coke is essentially a diluted and flavoured phosphoric acid, which is what I use for reducing alkalinity.
     
  7. Dec 9, 2018 #7

    Druncan

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    Awesome discovery, got loads of OOD coke to dispose of and in a high temp alcal base level, will report back!
     
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  8. Dec 14, 2018 #8

    Argentum

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    Where is the data for Coca-Cola acidity coming from? I would imagine that 17% phosphoric acid is appreciably more acidic than Coca-Cola. I believe that standard Coca-Cola is about 2.53 pH. What pH do you read for 17% Phosphoric Acid?
     
  9. Dec 14, 2018 #9

    IainM

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    No chance that cola is 17% phosphoric acid. It has a pKa of 2.15, so at 17% that would give a pH of around 1.5. I think someone may have confused 60mg per can with 60g per can. Back of an envelope. you might need closer to 1 part cola to 2 parts liquor. :vomitintoilet:
     
  10. Dec 14, 2018 #10

    Argentum

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    Transitioning from 2.53 pH for Coca-Cola to 1.5 pH for 17% phosphoric acid indicates that 17% phosphoric acid is about 11 times more acidic than Coca-Cola.
     
  11. Dec 14, 2018 #11

    IainM

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    OK, lets do this properly. From Coca-Cola: "A glass (250 mL) of Coca-Cola provides 43 mg of phosphorus".

    That is 172 mg/litre of phosphorous. Phosphoric acid has mass of 98, of which 31 is phosphorous, so this gives 172*98/31 = 544 mg of H3PO4 per litre. So, coke is a 5.6mM H3PO4 solution, which at pKa of 2.15 gives a pH of 2.43. This is in line with the figure @Argentum gives.

    So, rather than 17% phosphoric acid, cola is closer to being a 0.5% solution.
     
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  12. Dec 14, 2018 #12

    MyQul

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    Completely dont understand what you've just said (apart from the last line) Ian but thanks for the clarifaction, as I'm finding this thread rather intriguing :hat:
     
  13. Dec 14, 2018 #13

    strange-steve

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    Since I read the OP I thought it didn't sound right but I'm wasn't smart enough to work it out so thanks for that clapa
     
  14. Dec 17, 2018 #14

    IainM

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    EDIT: that should be 0.05%
     
  15. Dec 17, 2018 #15

    ACBEV

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    What @IainM is really saying... You need shedloads more coke.
     
  16. Dec 17, 2018 #16

    AdeDunn

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    Cherry Cola stout anybody? :laugh8:
     
  17. Dec 17, 2018 #17

    IainM

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    I was was just looking at the water calcs for the TT Landlord clone I'm putting on tonight. If I use 100% cola, then I'd hit the numbers.
     
  18. Dec 17, 2018 #18

    -Bezza-

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    Anyone else now wondering if they can get a few litres of pop into their next brew? Few extra points with all that sugar too.
     
  19. Dec 17, 2018 #19

    Norfolk79

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    The question is what drink would you have if you tried to ferment 100% full fat coke?
     
  20. Dec 17, 2018 #20

    IainM

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