Lab 2 - Titration of Amino Acid Flashcards
Equilibrium
When the concentration of both components becomes constant
When the concentration of both components become constant
Equilibrium
Dynamic Equilibrium
The rates of the forward and backward reactions are identical
The rates of the forward and backward reactions are identical
Dynamic Equilibrium
Dissociation
Reactions in which a compound or ion breaks up in a solvent into 2 or more units, at least one of which is an ion
Reactions in which a compound or ion breaks up in a solvent into 2 or more units, at least one of which is an ion
Dissociation
AKA Ionization
Dissociation
Ionization Constant
Equilibrium Constant
Keq=Ki=[H+][A-}/[HA]
pH
degree of acidity, that is the hydrogen concentration in moles per liter
Hydrogen concentration in moles per liter
pH
pH formula
pH=-log[H+]
Dissociation of Weak Acids
An acid liberates protons to a medium. A base will combine with a proton.
Buffers
Contain substances which offer the ability to resist pH changes
Contain substances which offer the ability to resist pH changes
Buffers
Titrations
Stepwise addition of a standardized base or acid to a solution
Stepwise addition of a standardized base or acid to a solution
Titrations
pKa
Tells us how acidic a Hydrogen atom in a molecule is
pKa on a graph
Point at which [acid] = [base]
Midpoint on a graphed line
Tells us how acidic a Hydrogen atom in a molecule is
pKa
Isoelectric point
pI
pI
Isoelectric point, the pH at which a particular molecule carries no net electrical charge
pI on a graph
(pK1 + pK2)/2 = pI
pK1 is to the left and pK2 is to the right of the graph
Purpose of Titration
Allows you to find the concentration of a known amount of an unknown acid or base by using another acid or base whose volume you already know
Titration Curve graph
x-axis = Volume y-axis = pH
