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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.
Balance is the key. Too alkaline is as undesirable as too acidic (though easier to tolerate). In a pH balanced body, urine is slightly acid in the morning (after fasting), with a pH range of 6.5 - 7.0, generally becoming more alkaline, pH = 7.5 - 8.0, by evening as the body digests food and releases electrolytes.