Titrations Flashcards
What is a titration?
A solution of known concentration is used to determine the concentration of an unknown solution.
What is a titrant?
The known solution, what is added to the analyte
What is an analyte?
The unknown solution, what the titrant is added to.
What is the equivalence point?
The point in a titration when the moles of the added species equals the original moles of the other species
What is an acid-base titration curve?
A plot of the pH of an acid/base solution vs the volume of the base/acid added to it
In titration of a strong acid with a strong base, is the intial pH very large or small?
Very small because, initially, there is only the strong acid.
In titration of a strong acid with a strong base, does pH rise very quickly or slowly?
Very quickly
In titration of a strong acid with a strong base, what is the pH at the equivalence point?
7 because the moles of OH added equals the original H3O moles
In titration of a strong acid with a strong base, does the pH change quickly or slowly beyond the equivalence point?
The pH rises slowly beyond the equivalence point
What is the end point?
The point where the indicator changes color
Should the end point be close to the equivalence point, higher, or lower?
Should be close
If a buffer system has a higher [HA], does it have more capacity to react with added acid or base?
Base
If a buffer system has a higher [A-], does it have more capacity to react with added acid or base?
Acid
What is the product of titrating a weak acid?
A weak base, the original acid’s conjugate base
What is the product of titrating a weak base?
A weak acid, the original base’s conjugate acid
What is the product of titrating a strong acid or base?
A solution with neutral pH of 7
The region between the initial state and the equivalence point in a weak acid-strong base or weak base-strong acid titration is called what?
Buffer region
At what point on a titration curve does pH = pKa?
The midpoint of the buffer region
For what type of titration curve is the equivalence point pH above 7?
Weak acid-strong base
For what type of titration curve is the equivalence point pH under 7?
Weak base-strong acid
