Final answer:
Antacids are not acidic; they are basic substances used to neutralize stomach acid. Meanwhile, ketone bodies, metabolic by-products of alcohol ingestion, and salicylate from aspirin are all acidic.
Step-by-step explanation:
The substance among the options given that is not acidic is antacids. Antacids are not acidic; they are basic substances used to neutralize stomach acid. Meanwhile, ketone bodies, metabolic by-products of alcohol ingestion, and salicylate from aspirin are all acidic. Antacids are substances designed to neutralize stomach acid and relieve symptoms of heartburn or acid indigestion.
While ketone bodies and metabolic by-products of alcohol ingestion are acidic in nature and contribute to metabolic acidosis, antacids are basic and work by counteracting acidity. Also, salicylate from aspirin is a form of acetylsalicylic acid, which is acidic as well.