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  1. #1
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    Board mates I found a scientific explination for the washed ice (rinsed ice) technique of enjoying soda pop and throat burn. I found this information on the Virginia Educational Physics Website.
    Zabe
    To keep soda carbonated, is it best to keep it cold in the refrigerator or outside in the room? Also, why does soda fizz more when you pour it over ice than when you drop ice into already-poured soda--is that just because the falling liquid has more kinetic energy? -- DG

    To keep soda carbonated, you should minimize the rate at which carbon dioxide molecules leave the soda and maximize the rate at which those molecules return to it. That way, the net flow of molecules out of the soda will be small. To reduce the leaving rate, you should cool the soda--as long as ice crystals don't begin to form, cooling the soda will make it more difficult for carbon dioxide molecules to obtain the energy they need to leave the soda and will slow the rate at which they're lost. To increase the return rate, you should increase the density of gaseous carbon dioxide molecules above the soda--sealing the soda container or pressurizing it with extra carbon dioxide will speed the return of carbon dioxide molecules to the soda. Also, minimizing the volume of empty bottle above the soda will make it easier for the soda to pressurize that volume itself. The soda will lose some of its carbon dioxide while filling that volume, but the loss will quickly cease.

    One final issue to consider is surface area: the more surface area there is between the liquid soda and the gas above it, the faster molecules are exchanged between the two phases. Even if you don't keep carbon dioxide gas trapped above soda, you can slow the loss of carbonation by keeping the soda in a narrow-necked bottle with little surface between liquid and gas. But you must also be careful not to introduce liquid-gas surface area inside the liquid. That's what happens when you shake soda or pour it into a glass--you create tiny bubbles inside the soda and these bubbles grow rapidly as carbon dioxide molecules move from the liquid into the bubbles. Cool temperatures, minimal surface area, and plenty of carbon dioxide in the gas phases will keep soda from going flat. As for pouring the soda over ice causing it to bubble particularly hard, that is partly the result of air stirred into the soda as it tumbles over the ice cubes and partly the result of adding impurities to the soda as the soda washes over the rough and impure surfaces of the ice. The air and impurities both nucleate carbon dioxide bubbles--providing the initial impetus for those bubbles to form and grow.

    Washing the ice to smooth its surfaces and remove impurities apparently reduces the bubbling when you then pour soda of it.

    Why do carbonated beverages "burn" your throat? -- TS

    When carbon dioxide gas (CO2) dissolves in water (H2O), its molecules often cling to water molecules in such a way that they form carbonic acid molecules (H2CO3). Carbonic acid is a weak acid, an acid in which most molecules are completely intact at any given moment. But some of those molecules are dissociated and exist as two dissolved fragments: a negatively charged HCO3- ion and a positively charged H+ ion. The H+ ions are responsible for acidity--the higher their concentration in a solution, the more acidic that solution is. The presence of carbonic acid in carbonated water makes that water acidic--the more carbonated, the more acidic. What you're feeling when you drink a carbonated beverage is the moderate acidity of that beverage "irritating" your throat.
    [ 05-19-2006, 09:20 AM: Message edited by: Mr Zabe ]
    Don't worry, be happy. Meher Baba

  2. #2
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    That's intresting, nice find Zabe!

  3. #3
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    Interesting answer, although I would more readily say that rinsed ice has water on its surface, thereby diluting the soda just a bit when poured. Therefore, the soda feels less carbonated as it goes down.

    Call me a non-believer.

  4. #4
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    Okay, I'm glad to read that too. Some interesting discussion of it, but I'm with DJ - not much of a believer. Actually, I've been starting to get maybe a little - I dunno, annoyed I guess - by the recent references to "rinsed ice". It seems kind of snobbish or something, and for me it would be a waste of time because I normally drink my sodas too quickly to gain anything by it. The only time I use ice with soda is when I have alcohol mixed in too. That's the only time I tend to "sip" instead of "chug"

    -Andy
    Give me some cane sugar real Pepsi in a glass bottle... and not Throwback!

  5. #5
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    Apr 2006
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    I guess I have to go against this thread and say I was a believer.

    I was a non-believer in the rinsed ice until I tried the trick with a Cheerwine. With rinsed ice, the drink was more fizzy going down. If I didn't rinse the ice, my Cheerwine was a little flat. It was still heaven, but it's better with rinsed ice, IMHO.

  6. #6
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    Wait, so is this technique supposed to subdue the soda's carbonation or enhance it?

  7. #7
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    DJHS
    The rinsed ice procedure will enhance the carbonation of the soda pop. It's like adding an octane booster to a tank of gas. The soda pop does not use any gas to make foam/head carbonation bublles,the gas stays in the soft drink.

    Party on. [img]smile.gif[/img]
    Don't worry, be happy. Meher Baba

  8. #8
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    Ok, so after re-reading this blurb, I now see that the argument states that by rinsing the ice, the water will melt the outer-most parts of the cubes, rounding out their edges, and make them more hydrodynamic.

    I'm still a skeptic.

  9. #9
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    I can see your point. It works very well for me. [img]smile.gif[/img]
    Don't worry, be happy. Meher Baba

  10. #10
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    Feb 2006
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    Who doesn't love science?! Thanks for the interesting read.

    In my opinion, it looks better over rinsed ice, and it just tastes better as well. Even if that article had disproven any difference, the perceived difference is enough for me to rinse the cubes off before tumbling them into the glass. Now, I have the science to prove to my wife I'm not crazy for doing it.

    Speaking of which...time for a cool refreshing beverage over rinsed ice.

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