Question

apple juice has a lower ph than black coffee. which best explains the relationship?
apple juice has fewer hydrogen ions than black coffee.
apple juice has more hydrogen ions than black coffee.
apple juice has the same number of hydroxide ions as black coffee.
apple juice has more hydroxide ions than black coffee.

Explanation:

The pH scale is based on the concentration of hydrogen ions ($H^+$). A lower pH indicates a higher concentration of hydrogen ions. Since apple - juice has a lower pH than black coffee, it has more hydrogen ions.

Answer:

Apple juice has more hydrogen ions than black coffee.