A 45-year-old male patient with a history of chronic kidney…

A 45-year-old male patient with a history of chronic kidney disease is admitted to the hospital with weakness and confusion. His arterial blood gas (ABG) results are as follows: pH: 7.28 PaCO2: 36 mmHg HCO3-: 18 mEq/L Based on these ABG results, which acid-base imbalance is the patient experiencing?