What is the pH of a buffer solution prepared by mixing 100 mL of 0.20 M acetic acid ( CH 3COOH, K a = 1.8 x 10 -5, pK a = 4.74) with 100 mL of 0.10 M sodium acetate ( CH 3COONa)?

What is the pH of a buffer solution prepared by mixing 100 mL of 0.20 M acetic acid ( $C H_{3} C O O H$ , $K_{a} = 1.8 \times 1 0^{- 5}$ , $p K_{a} = 4.74$ ) with 100 mL of 0.10 M sodium acetate ( $C H_{3} C O O N a$ )?

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