CHEM 104 EXAM13 Exam Questions and
Answers Verified Solutions Latest Update
2026/2027
Question:
| A+
• -definition of buffer
-numerical requirement
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
Question:
• format of buffer equation
Answer:
HX + MOH -> H2O + MX acid. base. water. salt
Question:
• what are the strong acids
Answer:
HCl, HBr, HI, HNO3, H2SO4, HClO4
Question:
• 2 ways to find pH if Ka is known
Answer:
1- make ICE table to find H3O+ 2- H-H law (pka=-log ka)
, Question:
• 2 requirement of the H-H law
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
Question:
• how to select a buffer-
Answer:
acid/base pair with pKa within one pH unit of desired pH if there are two, pick the higher
concentration
Question:
• when to use SCF table
Answer:
used when adding a strong base or strong acid
Question:
• what does pka mean
Answer:
take the negative log
Question:
• how does increasing or decreasing concentration effect the effectiveness of the
buffer?
Answer:
higher concentration of the buffer, the better the buffering capacity
Question:
Answers Verified Solutions Latest Update
2026/2027
Question:
| A+
• -definition of buffer
-numerical requirement
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
Question:
• format of buffer equation
Answer:
HX + MOH -> H2O + MX acid. base. water. salt
Question:
• what are the strong acids
Answer:
HCl, HBr, HI, HNO3, H2SO4, HClO4
Question:
• 2 ways to find pH if Ka is known
Answer:
1- make ICE table to find H3O+ 2- H-H law (pka=-log ka)
, Question:
• 2 requirement of the H-H law
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
Question:
• how to select a buffer-
Answer:
acid/base pair with pKa within one pH unit of desired pH if there are two, pick the higher
concentration
Question:
• when to use SCF table
Answer:
used when adding a strong base or strong acid
Question:
• what does pka mean
Answer:
take the negative log
Question:
• how does increasing or decreasing concentration effect the effectiveness of the
buffer?
Answer:
higher concentration of the buffer, the better the buffering capacity
Question:
