Buffer Flashcards
Any solution containing appreciable amounts of both a weak acid and its conjugate base is highly resistant to changes in pH brought about by addition of strong acid or strong base.
Buffers
Buffer: Has a pH close to the _____ of the weak acid.
pKa
True or False: The pH of a buffer does change slightly on addition of moderate amounts of a strong acid or strong base.
true
has a limited capacity to react with H+ or OH− ions without undergoing a drastic change in pH.
Buffer
It is important to realize that the capacity of a buffer to absorb added OH− or H+ ions is ________ related to the slope of the curve.
inversely
is the pH range over which over which the buffer is effective. It is related to the ratio of concentrations of the weak acid and its conjugate.
Buffer range
An acid-base indicator is useful in determining the ________________ of an acid-base titration.
equivalence point
This is the point in which reaction is complete; equivalent quantities of acid and base have reacted.
Equivalence point
If the indicator is chosen properly, the point at which it changes color (its ________) coincides with the equivalence point.
end point
To understand how and why an indicator changes color, we need to understand the ______________ involved.
equilibrium principle
An acid-base indicator is derived from a weak acid ______
Hln
Strong acids ionize completely in water to form
H3O+ ions
strong bases dissolve in water to form ______.
OH− ions
The neutralization reaction that takes place when any strong acid reacts with any strong base can be represented by a ________
net ionic equation
Features of HCl being titrated by NaOH
NaCl salt is formed, pH at the equivalence point is 7
Near the equivalence point, the pH rises very rapidly
