I think 270.9. I hope this helps
Answer:
0.40 M HCN and 0.10 KCN
Explanation:
A buffer solution is defined as the aqueous mixture of a weak base and its conjugate base or vice versa.
For the systems:
0.10 M KCN 0.20 M CH3COOH: Acetic acid, CH₃COOH is a weak acid and KCN is the conjugate base of HCN. Here, you have a weak acid and a conjugate base but not the conjugate base of the acetic acid or the weak acid of KCN. Thus, <em>it is not a buffer.</em>
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1.0 M HNO3 and 1.0 M NaNO3. HNO₃ is a strong acid. Thus, this system <em>is not a buffer.</em>
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0.40 M HCN and 0.10 KCN. Here, you have HCN, the weak acid, and KCN, its conjugate base. Thus, <em>it is a buffer.</em>
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0.50 M HCl and 0.10 NaCl. HCl is a strong acid, thus, its mixture with NaCl <em>is not a buffer.</em>
Is this a chemistry pun? It's <span>carbon.</span>
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