Question

the following statements is correct?
toothpaste is more basic than household ammonia
pure water is more basic than toothpaste
pure water is more acidic than black coffee
household ammonia is more acidic than bleach

Explanation:

The pH scale ranges from 0 - 14. A pH of 7 is neutral. Values less than 7 are acidic, and values greater than 7 are basic. The higher the pH above 7, the more basic a substance is. The lower the pH below 7, the more acidic a substance is.

• For the statement "Toothpaste is more basic than household ammonia": Toothpaste has a pH of 9, and household ammonia has a pH of 11. Since 9 < 11, toothpaste is less basic than household ammonia.
• For the statement "Pure water is more basic than toothpaste": Pure water has a pH of 7, and toothpaste has a pH of 9. Since 7 < 9, pure water is less basic than toothpaste.
• For the statement "Pure water is more acidic than black coffee": Pure water has a pH of 7, and black coffee has a pH of 5. Since 7 > 5, pure water is less acidic than black coffee.
• For the statement "Household ammonia is more acidic than bleach": Household ammonia has a pH of 11, and bleach has a pH of 13. Since 11 < 13, household ammonia is less basic (more acidic) than bleach.

Answer:

Household ammonia is more acidic than bleach.