CHEM 104 Exam 3 Questions With
Correct Answers
-definition of buffer | |
-numerical requirement - CORRECT ANSWER✔✔--a weak acid and its
| | | | | | | | |
conjugate base or a weak base and its conjugate acid that is resistant to
| | | | | | | | | | | | | |
changes in pH when reacting with a strong acid or strong base
| | | | | | | | | | |
-must be in a 10:1 ratio
| | | | |
format of buffer equation - CORRECT ANSWER✔✔-HX + MOH -> H2O +
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MX
acid . base . water . salt
| | | | | |
what are the strong acids - CORRECT ANSWER✔✔-HCl, HBr, HI, HNO3,
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H2SO4, HClO4 |
2 ways to find pH if Ka is known - CORRECT ANSWER✔✔-1- make ICE
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table to find H3O+
| | |
2- H-H law (pka=-log ka)
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, 2 requirement of the H-H law - CORRECT ANSWER✔✔-1- ratio must be
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between .1 and 10 | | |
2- the concentration of conj base and conj acid must each exceed Ka by
| | | | | | | | | | | | | |
a factor of 100 or more
| | | | |
how to select a buffer- - CORRECT ANSWER✔✔-acid/base pair with pKa
| | | | | | | | | | |
within one pH unit of desired pH
| | | | | |
if there are two, pick the higher concentration
| | | | | | |
when to use SCF table - CORRECT ANSWER✔✔-used when adding a
| | | | | | | | | | |
strong base or strong acid
| | | |
what does pka mean - CORRECT ANSWER✔✔-take the negative log
| | | | | | | | |
how does increasing or decreasing concentration effect the
| | | | | | | |
effectiveness of the buffer? - CORRECT ANSWER✔✔-higher | | | | | | |
concentration of the buffer, the better the buffering capacity | | | | | | | |
TITRATIONS - CORRECT ANSWER✔✔- | | |
graph equivalence pH of:
| | |
-strong acid and strong base curve
| | | | |
-weak acid/ strong base curve
| | | |
Correct Answers
-definition of buffer | |
-numerical requirement - CORRECT ANSWER✔✔--a weak acid and its
| | | | | | | | |
conjugate base or a weak base and its conjugate acid that is resistant to
| | | | | | | | | | | | | |
changes in pH when reacting with a strong acid or strong base
| | | | | | | | | | |
-must be in a 10:1 ratio
| | | | |
format of buffer equation - CORRECT ANSWER✔✔-HX + MOH -> H2O +
| | | | | | | | | | | |
MX
acid . base . water . salt
| | | | | |
what are the strong acids - CORRECT ANSWER✔✔-HCl, HBr, HI, HNO3,
| | | | | | | | | | |
H2SO4, HClO4 |
2 ways to find pH if Ka is known - CORRECT ANSWER✔✔-1- make ICE
| | | | | | | | | | | | | |
table to find H3O+
| | |
2- H-H law (pka=-log ka)
| | | |
, 2 requirement of the H-H law - CORRECT ANSWER✔✔-1- ratio must be
| | | | | | | | | | | |
between .1 and 10 | | |
2- the concentration of conj base and conj acid must each exceed Ka by
| | | | | | | | | | | | | |
a factor of 100 or more
| | | | |
how to select a buffer- - CORRECT ANSWER✔✔-acid/base pair with pKa
| | | | | | | | | | |
within one pH unit of desired pH
| | | | | |
if there are two, pick the higher concentration
| | | | | | |
when to use SCF table - CORRECT ANSWER✔✔-used when adding a
| | | | | | | | | | |
strong base or strong acid
| | | |
what does pka mean - CORRECT ANSWER✔✔-take the negative log
| | | | | | | | |
how does increasing or decreasing concentration effect the
| | | | | | | |
effectiveness of the buffer? - CORRECT ANSWER✔✔-higher | | | | | | |
concentration of the buffer, the better the buffering capacity | | | | | | | |
TITRATIONS - CORRECT ANSWER✔✔- | | |
graph equivalence pH of:
| | |
-strong acid and strong base curve
| | | | |
-weak acid/ strong base curve
| | | |
