A mixture made from 10 mL of 1 M HCl and 20 mL of 1 M CH₃COONa would be classified as a buffer solution.

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A buffer solution is formed when a weak acid and its conjugate base are present. In this case, HCl (strong acid) reacts with CH₃COONa (sodium acetate, which provides the conjugate base CH₃COO⁻) to form acetic acid (CH₃COOH), a weak acid, and NaCl. The presence of CH₃COOH and CH₃COO⁻ creates a buffer solution.

A Mixture Made from 10 ML of 1 M HCl