So I tried that classic vinegar and baking soda volcano with my kid last weekend, and it got me thinking. The reaction fizzing out of the papier-mâché mountain seemed way less powerful than I remember from my own childhood. I’m pretty sure we used the same rough amounts. Could the brand or age of the baking soda really make that much of a difference in the reaction’s vigor?
I doubt brand matters much for the volcano effect. Baking soda is baking soda even if the package claims something fancy. What can change the fizz is how it mixes and how long the gas has to escape. If your kid touched the paper mountain with damp hands the surface could slow the reaction a bit.
From a chemistry angle the material matters less than how fast the acid meets the base. Baking soda that has absorbed moisture can clump and slow the dissolution in vinegar. Even if the amount is the same a lump reduces surface area making the fizz appear milder.
For me the moment you see the foam jump out is the real magic not the punch of the stream. Baking soda was just the trigger and my kid smiled the same way now as I did years ago.
You might be mistaking the spark for a later effect. If the mountain surface soaked up vinegar and the baking soda never mixed rapidly the eruption could feel weaker.
Maybe we should reframe the idea as a design problem not a chemistry race. The spectacle matters more than a big fizz stack. If you want a louder eruption you can change container geometry or use more surface area for the baking soda to meet vinegar.
That would be odd unless the vinegar strength or baking soda quality varied you could see a milder blast. Age could matter but not as a single cause.