CHEM 104 EXAM 13 ACTUAL TEST PAPER QUESTIONS CORRECT ANSWERS GRADED A
PLUS
CHEM 104 Exam13 Questions and Answers Verified
Solutions Latest Update 2026/2027
Question:
-definition of buffer
Answer:
Question:
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?
PLUS
CHEM 104 Exam13 Questions and Answers Verified
Solutions Latest Update 2026/2027
Question:
-definition of buffer
Answer:
Question:
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?
