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  • sodium bicarbonate caking?

    From Oumati Asami@21:1/5 to All on Fri Oct 25 09:53:30 2019
    Would sodium bicarbonate absorb moisture from air and become a cake?
    Many solids do that. Not sure if sodium bicarbonate would also.

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  • From Norm Why@21:1/5 to Oumati Asami on Mon Oct 28 16:40:39 2019
    "Oumati Asami" <ouasami@do-not-send.com> wrote in message news:qotprj$1r4$1@gioia.aioe.org...
    Would sodium bicarbonate absorb moisture from air and become a cake? Many solids do that. Not sure if sodium bicarbonate would also.

    Yes, I think it would with time and humidity. Sodium bicarbonate in its box
    is often put into refrigerators to absorb smells. To be regenerated requires heat. But to do so would release CO2 and convert sodium bicarbonate to
    sodium carbonate,

    2NaHCO3 -> Na2CO3 + CO2 + H2O

    So most people just throw away the box when it becomes stale.

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  • From Libor Striz@21:1/5 to Oumati Asami on Tue Oct 29 15:08:20 2019
    Oumati Asami <ouasami@do-not-send.com> Wrote in message:r
    Would sodium bicarbonate absorb moisture from air and become a cake? Many solids do that. Not sure if sodium bicarbonate would also.

    It is more complicated, as it slowly decomposes:

    2 NaHCO3 -> Na2CO3 + H2O + CO2.

    --
    Poutnik ( the Wanderer )

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  • From Frank <"frank@21:1/5 to Libor Striz on Wed Oct 30 14:35:31 2019
    On 10/29/2019 10:08 AM, Libor Striz wrote:
    Oumati Asami <ouasami@do-not-send.com> Wrote in message:r
    Would sodium bicarbonate absorb moisture from air and become a cake? Many solids do that. Not sure if sodium bicarbonate would also.

    It is more complicated, as it slowly decomposes:

    2 NaHCO3 -> Na2CO3 + H2O + CO2.

    Mechanisms have been elucidated:

    https://www.jstage.jst.go.jp/article/shigentosozai/118/7/118_7_511/_article/-char/en

    I had to look up this one: Wegscheider's Salt (Na 2 CO 3 3NaHCO 3 )

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