Answer
a) This is a buffer
b) The is a buffer
c) This is a buffer
d) This is not a buffer
Work Step by Step
a) It is a buffer because it is a weak acid and its salt
b) It is a buffer because it is a weak acid and its salt
c) It is a buffer because it is a weak base and its salt
d) It is not a buffer because hydroiodic acid is a strong acid