To rank the solutions from most acidic to least acidic, we can consider their typical pH levels:
- Orange juice - Typically has a pH range of about 3 to 4, making it quite acidic.
- Black coffee - Usually has a pH around 4.5 to 6, which is less acidic than orange juice but still mildly acidic.
- Seawater - Generally has a pH around 7.5 to 8.5, which is slightly alkaline.
- Soapy water - Generally has a pH greater than 9, making it basic (alkaline).
Based on this information, the ranking from most acidic to least acidic is:
- Orange juice
- Black coffee
- Seawater
- Soapy water