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Renal tubular acidosis, a kidney condition that makes the urine more acidic. Kidney stones form more easily in acidic urine. ... Uric acid, calcium oxalate, and cystine stones form more readily in acidic urine, so this prevention strategy hinges on keeping the urine slightly alkaline.
Alkaline urine, usually containing bicarbonate-carbonic acid buffer, is normally excreted when there is an excess of base or alkali in the body. Secretion of an acid or alkaline urine by the kidneys is one of the most important mechanisms the body uses to maintain a constant body pH.A highly acidic urine pH occurs in: 1  Acidosis. 2  Uncontrolled diabetes.ecretion of an acid or alkaline urine by the kidneys is one of the most important mechanisms the body uses to maintain a constant body pH. A highly acidic urine pH occurs in: 1  Acidosis. 2  Uncontrolled diabetes.