A 58-year-old man with chronic kidney disease stage 4 (eGFR 22 mL/min/1.73m²) presents with metabolic acidosis (pH 7.28, HCO₃⁻ 16 mEq/L, normal anion gap). He is asymptomatic and has no contraindications to alkali therapy. What is the drug of choice for management of his metabolic acidosis?

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