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Experimental Chemistry (Chem-C125) Formal Lab Report Of Vinegar Lab

Sandra Watson
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Indiana University – Purdue University Indianapolis

Experimental Chemistry (Chem-C125)

Finding Unknown Concentration using Titration
Most people have faced some kind of stomach problem in their lives. One of the
most common stomach problem is having too much stomach acid. This problem can be
easily dealt with by taking antacids (base) such as Tums, which can reduce the amount of
stomach acid. According to belmarrahealth.com, stomach acid helps process food and
kills harmful bacteria, however, too much of stomach acid can lead to severe disorders if
it is not treated. Acids and bases can be found in common every day foods, in-taking
large quantities of either can cause many problems. So, how does one know how much of
each substance is needed to neutralize each other? How much concentration can be
neutralized with the given amount of acid or base? They use a process called acid-base
titration. Acids are molecules that produce H+ ions in aqueous solution, bases on the
other hand produce OH- ions. In an acid-base reaction, the H+ ions and the OH- ions mix
together and neutralize the reaction, the reaction usually produces water and a salt. For
NaOH (base) + C2H4O2 (acid)  NaC2H3O2 (salt) + H20 (water) (1)
The purpose of an acid-base titration is to find the concentration of an unknown
acid or base using a known value. In the given example above (1), theoretically, enough
amount of NaOH will neutralize the C2H4O2; this is called the equivalent point of the
titration. However, due to the microscopic measurements that people can’t do yet, it is
impossible to get an actual equivalent point; this is where pH indicators come in. pH
indicators can be used to find the end point of the titration, the end point can be noticed
by a color change of the solution. In the example above (1), if the color of the solution
changes, then it means that a small amount of NaOH is excess in the solution.



Experimental Chemistry (Chem-C125) Formal Lab Report Of Vinegar Lab

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