$0.10mol$ $HCl$ wouldn't form a buffer with 1L of $0.20M$ $ CH_3COOH$.
Work Step by Step
- A buffer needs: 1. An acid, so it can neutralyze added bases: $CH_3COOH$. 2. A base, so it can neutralyze added acids: Missing. Therefore, $HCl$ and $CH_3COOH$ (Two acids), are not capable of making a buffer.