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