Acids are substances that donate protons (H+ ions) to other substances. They are typically sour in taste and can react with metals to produce hydrogen gas. Some common acids include hydrochloric acid (HCl), sulfuric acid (H2SO4), and nitric acid (HNO3).
Bases are substances that accept protons (H+ ions) from other substances. They are typically bitter in taste and can react with acids to produce water and salt. Some common bases include sodium hydroxide (NaOH), potassium hydroxide (KOH), and calcium hydroxide (Ca(OH)2).
The strength of an acid or base is determined by its ability to donate or accept protons. Strong acids and bases completely dissociate in water, releasing all of their protons or hydroxide ions. Weak acids and bases only partially dissociate in water, releasing only a small fraction of their protons or hydroxide ions.
The pH scale is used to measure the acidity or basicity of a solution. The pH scale ranges from 0 to 14, with 7 being neutral. A solution with a pH below 7 is acidic, while a solution with a pH above 7 is basic.
Here is a table that summarizes the key differences between acids and bases:
| Property | Acid | Base |
|---|---|---|
| Taste | Sour | Bitter |
| Reaction with metals | Produces hydrogen gas | No reaction |
| Reaction with acids | No reaction | Produces water and salt |
| Strength | Strong acids completely dissociate in water; weak acids only partially dissociate in water | Strong bases completely dissociate in water; weak bases only partially dissociate in water |
| pH | Below 7 | Above 7 |
