Interesting question, Michael. I think that the whole obsession some seem to have with acid/base balance is misplaced (see also here and here for previous discussions).
Urine pH between 4.5 and 8 is normal. Urine pH varies depending on your diet and even the time of day. Your urine will tend to be acidic early in the morning. Meat-eaters tend to have more acidic urine than vegans/vegetarians. In fact, vegans exploit this difference to argue the whole "alkaline=good, acidic=bad" concept.
Urine pH can be used in screening for some kidney, metabolic and respiratory diseases. There are also rare cases when one may want to manipulate urine pH. For example, some kidney stones form in acid pH, while some form in alkaline pH. Some poisonings, such as aspirin, can be treated by alkalinizing the urine.
However, if you are healthy, you do not need to check or worry about your urine pH. When I went to medical school, there was an aphorism on the wards--"The kidneys are smarter than we are." So let your kidneys do their job(s), and don't try to over-think your body's acid/base balance.