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Determination Of An Unknown Amino Acid From Titration
Beginning of essay
Abstract
Experiment 11 used a titration curve to determine the identity of an
unknown amino acid. The initial pH of the solution was 1.96, and the pKa’s
found experimentally were 2.0, 4.0, and 9.85. The accepted pKa values were
found to be 2.10, 4.07, and 9.47. The molecular weight was calculat ....
Middle of essay
....e pH versus the volume
of titrant used. In the case of amino acids, the titrant will be both an acid
and a base. The acid is a useful tool because it is able to add a proton to the
amine group (see fig. 1). Likewise the base allows for removal of the proton
from the carboxyl group by the addition of hydroxide. The addition of the
strong acid or base does not necessarily yield a drastic jump in pH. The acid
or base added is unable to contribute to the pH of the solution because the
protons a.... |
| Number of words: 1634 |
Approximate pages: 6 |
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