Not sure if this is the reason, but most acid is diluted with water and
cold water will absorb the CO2 from the reaction and just become carbonated.

On 11/12/2015 04:40 PM, PT Ferrance wrote:
> Hi,
> Can anyone explain why bicarb fizzes when put into a room temperature
> acid but not when put into a cold one?  Thanks.
> PT
>

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