Which pair of substances forms an effective acidic buffer solution in aqueous medium?
Answer and explanation
Correct answer: B. Acetic acid (CH3COOH) and Sodium acetate (CH3COONa)
- Step 1: An acidic buffer consists of a weak acid and its conjugate base (salt with a strong base). Step 2. Acetic acid is a weak acid and sodium acetate provides high acetate ion concentration, creating an effective buffer. Answer: Acetic acid (CH3COOH) and Sodium acetate (CH3COONa). Why not the others: HCl/NaCl uses a strong acid (cannot buffer); NaOH is a strong base; H2SO4 is a strong acid.
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