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Ammonia has a pH of approximately 11, whereas urine has a pH of approximately 6. How many more times acidic is urine than ammonia?

A 100,000 times

Each time you move up the pH scale, you multiply the value by 10. So in this case, going from 6 to 11 is five steps up the scale—from 6 to 7, from 7 to 8, and so on. Therefore, you need 5 zeros, or 100,000.