Common Acid Names and Formulas- Complete List
What Are Acids? The Short Version
Acids are compounds that release hydrogen ions (H+) when dissolved in water. That's the basic definition. In chemistry, they're everywhere—in your stomach, in batteries, in the food you eat.
This guide gives you the complete list of common acid names and formulas you need for chemistry class, lab work, or just curiosity. No fluff.
Strong Acids You Must Know
Strong acids completely dissociate in water. They donate H+ ions like there's no tomorrow. Handle with care.
- Hydrochloric Acid (HCl) — Stomach acid. Used in cleaning and industrial processes. Common in labs.
- Sulfuric Acid (H₂SO₄) — King of acids. Used in car batteries, fertilizers, and chemical manufacturing. Highly corrosive.
- Nitric Acid (HNO₃) — Used in fertilizers and explosives production. Turns yellow over time.
- Hydrobromic Acid (HBr) — Used in pharmaceuticals and chemical synthesis.
- Hydroiodic Acid (HI) — Strongest binary acid. Used in organic synthesis.
- Perchloric Acid (HClO₄) — Extremely strong. Used in analytical chemistry and aerospace applications.
Weak Acids You Encounter Daily
Weak acids only partially dissociate in water. They're everywhere—in your food, your drinks, your body.
- Acetic Acid (CH₃COOH) — Vinegar. The smell tells you it's there.
- Carbonic Acid (H₂CO₃) — Found in soft drinks. Decomposes to CO₂ and water.
- Phosphoric Acid (H₃PO₄) — In cola drinks and rust removers. Used in food additives.
- Formic Acid (HCOOH) — Ant stings and bee stings. Simplest carboxylic acid.
- Citric Acid (C₆H₈O₇) — Citrus fruits. Used as a preservative and flavoring.
- Lactic Acid (C₃H₆O₃) — In muscles after exercise. Used in food and skincare.
- Benzoic Acid (C₇H₆O₂) — Used as a food preservative. Found naturally in some fruits.
Organic Acids: Where Chemistry Meets Biology
Organic acids contain carbon and are central to biological processes. You produce them. You eat them. You use them without thinking.
Key Organic Acids
- Oxalic Acid (C₂H₂O₄) — Found in rhubarb and spinach. Used in cleaning products.
- Tartaric Acid (C₄H₆O₆) — In grapes and wine. Gives cream of tartar its properties.
- Malic Acid (C₄H₆O₅) — In apples. Used as a flavoring agent.
- Succinic Acid (C₄H₆O₄) — Found in amber and some plants. Used in food and industrial applications.
- Uric Acid (C₅H₄N₄O₃) — Produced by your body. High levels cause gout.
Oxyacids: Acids with Extra Oxygen
Oxyacids contain hydrogen, oxygen, and another element. The naming pattern is simple: more oxygen means "-ic" suffix, less oxygen means "-ous" suffix.
- Chlorous Acid (HClO₂) — Unstable, decomposes easily.
- Chloric Acid (HClO₃) — More stable than chlorous acid.
- Perchloric Acid (HClO₄) — Most oxygen, most stable of the chlorine oxyacids.
- Sulfurous Acid (H₂SO₃) — Formed when SO₂ dissolves in water.
- Hypochlorous Acid (HClO) — Used in disinfection and swimming pools.
Complete Reference Table: Common Acids
| Acid Name | Formula | Type | Common Uses |
|---|---|---|---|
| Hydrochloric Acid | HCl | Strong | Cleaning, pH control, steel pickling |
| Sulfuric Acid | H₂SO₄ | Strong | Batteries, fertilizers, chemicals |
| Nitric Acid | HNO₃ | Strong | Fertilizers, explosives, etching |
| Acetic Acid | CH₃COOH | Weak | Vinegar, food preparation, solvents |
| Phosphoric Acid | H₃PO₄ | Weak | Cola drinks, rust removal, fertilizers |
| Carbonic Acid | H₂CO₃ | Weak | Carbonated beverages |
| Citric Acid | C₆H₈O₇ | Weak | Preservative, flavoring, cleaning |
| Formic Acid | HCOOH | Weak | Ant bites, leather processing |
| Lactic Acid | C₃H₆O₃ | Weak | Food, skincare, muscle metabolism |
| Oxalic Acid | C₂H₂O₄ | Weak | Cleaning, bleaching, rust removal |
| Malic Acid | C₄H₆O₅ | Weak | Flavoring, candy, drinks |
| Tartaric Acid | C₄H₆O₆ | Weak | Baking, wine making |
| Perchloric Acid | HClO₄ | Strong | Analytical chemistry, aerospace |
| Hydrobromic Acid | HBr | Strong | Pharmaceuticals, synthesis |
| Hydroiodic Acid | HI | Strong | Organic synthesis |
How to Identify Acids: Quick Guide
Need to identify an acid in the lab or classroom? Here's what actually works.
pH Indicators
- Litmus paper — Turns red in acidic solutions. Blue in basic. Quick and cheap.
- Universal indicator — Shows exact pH range. Red for strong acids, orange for weak acids.
- Phenolphthalein — Stays colorless in acids. Turns pink in bases. Not useful for weak acid detection.
Chemical Tests
- Magnesium test — Drop magnesium ribbon into acid. If it fizzes and produces hydrogen gas, you have an acid.
- Blue cobalt chloride paper — Turns pink in acidic conditions.
Physical Properties
- Sour taste (not recommended for lab identification)
- Corrosive to metals
- Conduct electricity when dissolved
- Often have sharp, pungent odors
Acid Strength Comparison
| Acid | pKa Value | Strength Level |
|---|---|---|
| Hydroiodic Acid (HI) | -10 | Very Strong |
| Hydrobromic Acid (HBr) | -9 | Very Strong |
| Sulfuric Acid (H₂SO₄) | -3 (first H) | Very Strong |
| Hydrochloric Acid (HCl) | -7 | Strong |
| Nitric Acid (HNO₃) | -1.4 | Strong |
| Phosphoric Acid (H₃PO₄) | 2.1 (first H) | Moderate |
| Formic Acid (HCOOH) | 3.75 | Weak |
| Acetic Acid (CH₃COOH) | 4.76 | Weak |
| Carbonic Acid (H₂CO₃) | 6.35 | Weak |
| Citric Acid (C₆H₈O₇) | 3.13 (first H) | Weak |
Lower pKa means stronger acid. Anything below -2 is considered a strong acid. Above 0 is weak.
Safety Warning
Strong acids are dangerous. They cause severe burns, release toxic fumes, and can destroy materials on contact.
- Always wear goggles and gloves when handling concentrated acids
- Add acid to water, never water to acid
- Work in a fume hood when possible
- Know where the eyewash station is
What You Actually Need to Remember
For most purposes, memorize these six acids first:
- HCl — Hydrochloric acid
- H₂SO₄ — Sulfuric acid
- HNO₃ — Nitric acid
- CH₃COOH — Acetic acid
- H₂CO₃ — Carbonic acid
- H₃PO₄ — Phosphoric acid
These cover 90% of what you'll encounter in general chemistry, biology, and everyday applications. The rest are variations and specialty compounds you can look up when needed.