Exam 1 Session 2 Flashcards
The point In the curve at which the acid is exactly neutralized is called the ______.
Inflection point or equivalence point
A titration is an experiment in which measured amounts of ___ are added to a measured amount of ___.
Base (salt) and Acid
The +/- 1 rule defines the ____ region of a solution.
Buffer
A buffer solution consist of a ___ acid and it’s conjugate base.
Weak
The +/- 2 rule defines the ______ region of a solution.
All or nothing
2 ph units above a functional groups pKa, it will be fully _____.
Deprotonated
COO- or NH2
2 ph units below a functional groups pKa, it will be fully ______.
Protonated
COOH or NH3 +
The general structure of an amino acid includes a/n ______ group a/n ____ group, an R group, and a H group, all bound to a central alpha carbon.
Amino, carboxyl
R group = side chain
The _____ determines the identity of the particular amino acid.
R group
Identity means polar, nonpolar, etc..
Glycine alanine and leucine are examples of ____ amino acids.
Non polar
Contain no _____ atoms in their side chains so they will not readily hydrogen bond.
Electronegative
They may have van der waals forces or hydrophobic interactions.
Glycine, leucine, alanine
Serine, tyrosine, and cysteine are examples of ____ amino acids.
Neutral polar
Aspartate, glutamate, and lysine are examples of ______ amino acids.
Charged polar
In a free amino acid the carboxyl group and the amino group of the general structure are charged at neutral ph. A ______ has equal positive and negative charges. In solution it is electrically neutral.
Zwitterion
The ph at which a molecule has no net charge is called the _______.
Isoelectric point
The symbol for isoelectric point is____.
PI
For nonpolar and most neutral polar side chains the average isoelectric point value is ____.
6
pKa of the carboxyl group decreases the pKa of the amino group.
For cystine the average isoelectric point value is _____.
5
The pKa of the carboxyl group decreases the pKa of the side chain.
For histidine the average isoelectric point value is _____.
7.6 the pKa of the side side chain amino group and the pKa of the side chain.
