Final answer:
When urine stands at room temperature, it undergoes concentration changes and may exhibit a change in pH.
Step-by-step explanation:
When urine stands at room temperature, several changes can occur to its components. One of the noticeable changes is the increased concentration of the urine. This is due to the evaporation of water from the specimen, leaving behind a higher concentration of waste products, such as urea and creatinine. Additionally, the pH of the urine may change as certain chemical reactions occur.