Question

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Answer 1

You should not use vinegar. This reaction is used in vulcano models, It will explode/expand.
For this experiment you should use hydrochloric acid, since stomach acid "is" hydrochloric acid. The HCl concentration in the stomach is about 0.5% which is about 0.14M.
The reaction will be \(NaHCO_3 + HCl \rightarrow NaCl + H_2CO_3\)

You see NaCl (table salt) is produced in this reaction. You can come up with an experiment where you take 2 tubes. Add some 0.1M HCl and add bicarbonate to 1 of the tubes. Then measure the conductivity of the solutions in the 2 tubes. Salt increases the conductivity of a solution so the solution where you added bicarbonate should have a higher conductivity.

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