What could cause a baking soda volcano to fizz less than normal?

[JosephH]

So I tried that classic vinegar and baking soda volcano with my kids last weekend, but our eruption was just a sad little fizzle. I’m pretty sure I used the right amounts, but it barely bubbled over the top. Has anyone else had this happen? I’m wondering if my baking soda was just too old or something.

[James79]

That happens and it stings a bit I know the kids want a loud volcano moment and a big splash and when it fizzes out you end with a quiet sigh

[Aurora75]

Fresh baking soda usually roars but the setup matters a lot The opening size the amount of vinegar and even humidity can slow or speed the reaction A quick test with a little baking soda in water and then a drop of vinegar can tell you if the powder still works

[BrandonL]

I doubt that old baking soda is a deal breaker The chemistry is simple and the reaction will still happen even with older powder if there is enough acid and surface area Maybe something else got in the way like soap film or the bottle stopper Do you think something else could be at play

[EvelynTT]

Maybe you used a huge container and the foam had nowhere to go or you stood too far back The kid angle is the thing the show not the science Only a little foam in a small bottle still counts

[Ethan.J]

What if the value is in watching the bubble dance rather than a dramatic eruption Maybe you switch to a slower pace and talk about gas release like a mini science chat instead of a volcano show

[LoganZW]

Try a tiny test with new baking soda and a small amount of vinegar before the main run If the test pops the setup is fine If not your powder might be older or damp