Answer 1:
It stays at the botton because it is denser.
Sodium bicarbonate (baking soda) has a density of
2.2 grams per cubic centimeter. Water has a
density of 1.0 grams per cubic centimeter.
Following Archimedes' law, the denser
material sinks to the bottom. Now, vinegar isn't
pure water - it has acetic acid in it - but it's
still not as dense as baking soda is, so the soda
sinks to the bottom.
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Answer 2:
When you mix baking soda and vinegar together,
the final products of the reaction are carbon
dioxide, water, and dissolved sodium acetate.
However, if you add too much baking soda, not all
of it will be reacted. Although baking soda
dissolves in water, if there is too much baking
soda it will not dissolve completely, and you
will see it in in the bottom of your container.
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