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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.
The salts must be excreted in order to maintain the correct balance of fluids and electrolytes in the body. The color of urine comes from bilirubin, a bile pigment. Normal urine is acidic, but this varies depending on diet and other factors.