I guess it depends on what you have been drinking, cola and other fizzy drinks will make your urine more acidic, rather than drinking orange squash etc.
It depends on the acid and the situation. Sulphuric acid on your skin is disastrous. Oxalic acid in your eyes is soothing. 5% Hydrochloric acid in your stomach is vital for digestion. Ascorbic acid...
Citric acid is recognized as safe for use in food by all major national and international food regulatory agencies. It is naturally present in almost all forms of life, and excess citric acid is...