Answer:
b. 0.05 M H₂CO₃ + 0.05 M KHCO₃
d. 0.1M HCN + 0.2M NaCN
g. 0.2M NH₃ + 0.1M NH₄Br
Step-by-step explanation:
A buffer solution consists of the following components:
- A weak acid and its conjugate base.
- A weak base and its conjugate acid.
Which would make a good buffer solution?
a. 0.3 M HC₂H₃0₂ + 0.1 M HCI
It does not have the components of a buffer solution. HCl is a strong acid.
b. 0.05 M H₂CO₃ + 0.05 M KHCO₃
It is a good buffer because it has a weak acid (H₂CO₃) and its conjugate base (HCO₃⁻), which comes from the salt.
c. 0.05 M KC₂H₃O₂
It does not have the components of a buffer solution.
d. 0.1M HCN + 0.2M NaCN
It is a good buffer because it has a weak acid (HCN) and its conjugate base (CN⁻), which comes from the salt.
e. 0.2M NaF + 0.2M NaOH
It does not have the components of a buffer solution. NaOH is a strong base.
f. 0.3M NH₄Cl
It does not have the components of a buffer solution.
g. 0.2M NH₃ + 0.1M NH₄Br
It is a good buffer because it has a weak base (NH₃) and its conjugate acid (NH₄⁺), which comes from the salt.