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Strawberry Fizz Description Hydrochloric acid is added to a yellow solution in an Erlenmeyer flask - red foam is produced. Explanation The generic premise of this demonstration is an acid base reaction with an indicator. The baking soda, dish soap, water, and methyl red indicator are mixed in an Erlenmeyer flask, and this should produce a yellow (and therefore basic) solution. To this is added the concentrated hydrochloric acid, which reacts with the baking soda to produce red foam. The red comes from the indicator; since the solution has changed from basic to acidic, the color changes from yellow to red. The foam comes from the carbon dioxide that is released in the reaction. These gas bubbles work with the dish soap to produce foam. still have questions? email us! explanation furnished by Colorado College's Sarah McCants
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