The purpose of this activity is to experimentally determine which acid
is stronger, vinegar or HCl, by comparing how each reacts with NaOH (a base), NaHCO3
(baking soda, a carbonate), and Mg (a metal).
As you know, acids are neutralized by bases. Acids react with carbonates to produce CO2
. Finally, acids will dissolve most metals, creating hydrogen gas
in the process.
0.10 M HCl
0.10 M NaOH
two small beakers
Procedure: You must develop a procedure for each separate part of the experiment.
Part a: NaOH
You could place an equal number of drops of vinegar and HCl into two test tubes. Add a drop of universal indicator
to each. Add NaOH, drop by drop, until each is neutralized. The stronger acid
will require more drops of NaOH to become neutralized than does the weaker acid. Use this method, or develop your own.
Part b: NaHCO3 (baking soda)
Develop a method, using baking soda, that will show whether vinegar or HCl is the stronger acid. You can use baking soda in the solid
state, or dissolve it in water to make an aqueous
Part c: Mg
Develop a method, using magnesium metal, that will show whether vinegar or HCl is the stronger acid. (You might like to use the flame test to prove to yourself that the gas
formed is H2
Conclusion: For each test, state your procedure and your findings.