Final answer:
To determine if the mixing of each pair of solutions results in a buffer, we need to identify if there is a conjugate acid-base pair present in the solution.
Step-by-step explanation:
To determine if the mixing of each pair of solutions results in a buffer, we need to identify if there is a conjugate acid-base pair present in the solution.
a.) 75.0 mL of 0.10 M HF (conjugate acid) ; 55.0 mL of 0.15 M NaF (conjugate base)
Therefore, this pair of solutions does result in a buffer.
b.) 150.0 mL of 0.10 M HF (conjugate acid) ; 135.0 mL of 0.175 M HCl (not a conjugate base)
Therefore, this pair of solutions does not result in a buffer.
c.) 165.0 mL of 0.10 M HF (conjugate acid) ; 135.0 mL of 0.050 M KOH (not a conjugate base)
Therefore, this pair of solutions does not result in a buffer.
d.) 125.0 mL of 0.15 M CH₃NH₂ (conjugate base) ; 120.0 mL of 0.25 M CH₃NH₃Cl (conjugate acid)
Therefore, this pair of solutions does result in a buffer.