Titrations Flashcards
What is the “known” solution which as a precise and accurate concentration?
the titrant
Where is the equivalence point for the titration between a weak acid and a strong base?
pH > 7
What is the duration of a titration?
o A titration is performed until the solution has essentially experienced the entire range of pH conditions from acidic to basic (or basic to acidic)
Why are titrations performed?
o Titrations are performed to either measure the concentration of an unknown solution and/or to determine the Ka of an unknown acid (or Kb of an unknown base)
What was titrated for the equivalence point to be at a pH < 7?
strong acid and weak base
Where is the equivalence point for the titration between a weak base and a strong acid?
pH < 7
What are the 2 solutions of a titration?
the analyte and the titrant
What was titrated for the equivalence point to be at a pH > 7?
weak acid and strong base
At what point will a weak acid’s pH = pKa or a weak base’s pOH = pKb?
half-equivalence point
What is the point at which half of the original analyte has been neutralized?
half-equivalence point
What is a procedure in which a strong acid/base of accurate concentration is added stepwise in small amounts (aliquots) to incrementally neutralize the solution?
titration
Define Equivalence Point (stoichiometric point)
the point at which the number of moles of added base are equal to the number of moles of the acid in the analyte solution
What was titrated for the equivalence point to be at a pH = 7?
strong acid and strong base
What is the analyte?
The analyte is the “unknown” solution for which you would like to know the concentration or the equilibrium constant
• The analyte can either be an acid or base, and it can be either weak or strong
Where is the equivalence point for the titration between a strong acid and strong base?
pH = 7
What is the range of an indicator?
o The approximate range of a typical indicator is +/- 1 off the pKa value
Define half-equivalence point
the point at which half of the original analyte has been neutralized
What part of the titration is the “unknown” solution for which you would like to know the concentration or the equilibrium constant?
the analyte
What are indicators?
o Acid/base indicators are nothing more than a “special” type of weak acid or weak base
Define titration
procedure in which a strong acid/base of accurate concentration is added stepwise in small amounts (aliquots) to incrementally neutralize the solution
On a titration curve, where is the equivalence point?
near the end of the point of inflection
What is the titrant?
The titrant is the “known” solution which as a precise and accurate concentration
• The titrant is generally a strong acid or base
What is the point at which the number of moles of added base are equal to the number of moles of the acid in the analyte solution?
Equivalence Point (stoichiometric point)
How do indicators work?
o The acid form (protonated) will be one color while the base form (deprotonated) will have a different color
