CHM 2046 Exam 3 UPDATED ACTUAL Exam Questions and CORRECT Answers
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Course
CHM 2046
Institution
CHM 2046
CHM 2046 Exam 3 UPDATED ACTUAL
Exam Questions and CORRECT Answers
A ____________ is a solution that resists pH change by neutralizing the added acid or base. -
CORRECT ANSWER- buffer
A ____________ contains significant amounts of either a weak acid/base and its conjugate
base/acid. - CORRECT...
CHM 2046 Exam 3 UPDATED ACTUAL
Exam Questions and CORRECT Answers
A ____________ is a solution that resists pH change by neutralizing the added acid or base. -
CORRECT ANSWER✔✔- buffer
A ____________ contains significant amounts of either a weak acid/base and its conjugate
base/acid. - CORRECT ANSWER✔✔- buffer
A ______________ neutralizes small to moderate amounts of added acid or base without a
large change in its pH. - CORRECT ANSWER✔✔- buffer
The __________________ equation relates the pH of a buffer solution to the initial
concentration of the buffer components. - CORRECT ANSWER✔✔- Henderson-
Hasselbalch equation
If OH- is added, the stoichiometric amount of the ______________ is neutralized and
converted to the ________________. - CORRECT ANSWER✔✔- weak acid; conjugate
base
If H3O+ is added, the stoichiometric amount of the ________________ is neutralized and
converted to the ________________________. - CORRECT ANSWER✔✔- conjugate base;
weak acid
Adding an acid creates more ____________. - CORRECT ANSWER✔✔- acid
Adding a base creates more ____________. - CORRECT ANSWER✔✔- base
pKa + pKb = 14 - CORRECT ANSWER✔✔-
, The base is in lower concentration than its conjugate acid if (B/A) is ___________. -
CORRECT ANSWER✔✔- less than 1
The base is in higher concentration than its conjugate acid if (B/A) is ______________. -
CORRECT ANSWER✔✔- larger than 1
A buffer is most effective when the concentrations of acid and conjugate base are
_____________. - CORRECT ANSWER✔✔- equal
When choosing an acid to make a buffer, choose one whose pKa is the closest to the
____________ of the buffer. - CORRECT ANSWER✔✔- pH
A buffer is most effective when the concentrations of acid and conjugate base are at their
_____________ concentration. - CORRECT ANSWER✔✔- highest
The _____________ is the pH range over which a particular acid and its conjugate base can
be effective. - CORRECT ANSWER✔✔- buffer range
The effective buffer range is _________. - CORRECT ANSWER✔✔- -1 to +1
Buffers can be prepared by starting with a weak acid and adding a strong base that is
approximately _________ the moles of the weak acid. - CORRECT ANSWER✔✔- half
Buffers can be prepared by starting with a weak base and adding a strong acid that is
approximately _________ the moles of the weak acid. - CORRECT ANSWER✔✔- half
_______________ is the amount of acid or base that you can add to a buffer without causing
a large change in pH. - CORRECT ANSWER✔✔- Buffer capacity
If absolute concentrations of the buffer components increase, the buffer capacity will then
________________. - CORRECT ANSWER✔✔- increase
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