This is an image gallery of the chemical structures of acids. These include the strong acids, such as hydrochloric and nitric acid, as well as important weak acids. Amino acids are also listed. Most acids contain the element hydrogen, which serves as the donated proton when the acid dissociates in water.
Sulfuric Acid
![Ball-and-stick model of sulfuric acid.](https://cdn.statically.io/img/www.thoughtco.com/thmb/O0bkYUqfPW66udSxCfYCWcEOlbc=/1500x0/filters:no_upscale():max_bytes(150000):strip_icc()/sulfuric-acid-9c9ec0a270c2474eaa822b45816c9bf5.jpg)
Sulfuric acid is also known as sulphuric acid or vitriol. It is a mineral acid with the formula H2SO4. Pure sulfuric acid is colorless and odorless. It is one of the strong acids.
Hydrogen Iodide or Hydroiodic Acid
![This is the chemical structure for hydrogen iodide, HI or hydriodic acid.](https://www.thoughtco.com/thmb/sD9Ks-v4wsmc_-VGiSoAOk5Z5iU=/1500x0/filters:no_upscale():max_bytes(150000):strip_icc()/hydrogen-iodide-58b5efbe5f9b5860461f6f92.jpg)
The chemical formula of hydroiodic acid is HI. It is also known as hydriodic acid. Hydrogen iodide is a strong acid that completely dissociates in water.
Perchloric Acid
![Perchloric acid](https://www.thoughtco.com/thmb/bcVPODE11O7zNmZiaFV2DE4-w0g=/1500x0/filters:no_upscale():max_bytes(150000):strip_icc()/Perchloric-acid-e45b8f3c6bf84195920c13909c6c0495.jpg)
The chemical formula for perchloric acid is HClO4. Perchloric acid is a mineral acid. While stronger than sulfuric or nitric acid, perchloric acid solutions are generally safer to use. They become dangerously strong oxidizers when heated.
Hydrofluoric Acid
![This is the space-filling structure of hydrogen fluoride or hydrofluoric acid.](https://www.thoughtco.com/thmb/op7Hz2adY8_IL_YzAT39sAiv79o=/1500x0/filters:no_upscale():max_bytes(150000):strip_icc()/hydrofluoricacid-58b5efc25f9b5860461f7c03.jpg)
Hydrofluoric acid (HF) is considered to be a weak acid, but it is highly corrosive and acts as a strong acid for all practical purposes.
Hydrochloric Acid
![Space-filling model of hydrochloric acid, HCl.](https://www.thoughtco.com/thmb/psq0qZ3TZ-5HMrvGLstDKATjd7c=/1500x0/filters:no_upscale():max_bytes(150000):strip_icc()/hydrochloricacid-57e1b9e93df78c9cce3380eb.jpg)
Hydrochloric acid (HCl) is one of the strong acids. It is also known as muriatic acid.
Nitric Acid
![Nitric acid also is called aqua fortis or spirit of nitre.](https://www.thoughtco.com/thmb/WRB2G2azBWRoNe7FWKcD79C2HkQ=/1500x0/filters:no_upscale():max_bytes(150000):strip_icc()/GettyImages-147217089-652f209e5ea44ecd8b219ee2d0d8a455.jpg)
Nitric acid is also known as aqua fortis or spirit of niter. Its chemical formula is HNO3. Freshly prepared nitric acid is colorless, but the solution turns yellow over time due to decomposition into nitrogen oxides and water. Nitric acid is one of the strong acids.
Sulfonic Acid Functional Group
![This is the two-dimensional structure of the sulfonic acid or sulfo functional group.](https://www.thoughtco.com/thmb/aOYS_3JZvcNuiKogj0E-z5RmTFs=/1500x0/filters:no_upscale():max_bytes(150000):strip_icc()/sulfonicacidgroup-58b5e09f3df78cdcd8e543cc.jpg)
Phosphonic Acid Group
![This is the two-dimensional structure of the phosphonic acid or phosphono functional group.](https://www.thoughtco.com/thmb/87_D6stt8uvT7KN-ZHQEoNsEOR8=/1500x0/filters:no_upscale():max_bytes(150000):strip_icc()/phosphonicacidgroup-58b5e0ce5f9b586046f51ab7.jpg)
Phosphoric Acid Structure
![Ball and stick model of phosphoric acid.](https://www.thoughtco.com/thmb/9FbYfKvp6gY7Lp6NBaUzU6gz1Jw=/1500x0/filters:no_upscale():max_bytes(150000):strip_icc()/phosphoric-acid-0db74b4b99c04b059664f642f0c4ea0d.jpg)
Traumatic Acid
![Traumatic acid structure](https://www.thoughtco.com/thmb/fTDiRZItRFH097IQM5QwBIjrx6o=/1500x0/filters:no_upscale():max_bytes(150000):strip_icc()/traumatic-acid-26142ca0cb6d4a2880418870251821f5.jpg)
Traumatic acid is a dicarboxylic acid that is found in some plants. It stimulates healing when plant tissue undergoes trauma.
Moronic Acid
![Moronic acid is a naturally-occurring triterpene found in the sumac plant and mistletoe.](https://www.thoughtco.com/thmb/vIGcH_1op2kOAxLUi00bGScfIkM=/1500x0/filters:no_upscale():max_bytes(150000):strip_icc()/Moronic_acid-58b5bc453df78cdcd8b6c5be.jpg)
Moronic acid is a triterpene with the name 3-oxoolean-18-en-28-oic acid. It is extracted from the sumac plant and mistletoe. Its chemical formula is C30H46O3.
Citric Acid
![Ball and stick model of citric acid. Citric acid is also known as 2-hydroxypropane-1,2,3-tricarboxylic acid. It is a weak acid found in citrus fruits and used as a natural preservative and to impart a sour flavoring.](https://www.thoughtco.com/thmb/WQxxnW3XeWR27XVsyjXoOmG1MFk=/1500x0/filters:no_upscale():max_bytes(150000):strip_icc()/Citric-acid-75ce683fb27f468dbe1ca00945c90244.jpg)
Citric acid (C6H8O7) is a weak organic acid. It occurs in citrus fruits. Citric acid is an intermediate in the citric acid cycle, which is key to aerobic cellular metabolism.
Acetic Acid - Ethanoic Acid
![This is the chemical structure of acetic acid.](https://www.thoughtco.com/thmb/kiK7rFFN9OMyZAMwjxT7von4TZY=/1500x0/filters:no_upscale():max_bytes(150000):strip_icc()/acetic_acid-56a12b085f9b58b7d0bcb1a0.jpg)
Benzoic Acid
![Chemical structure of benzoic acid.](https://www.thoughtco.com/thmb/E4gvTUPaRESh50ZknF0wadPD6jA=/1500x0/filters:no_upscale():max_bytes(150000):strip_icc()/GettyImages-922922788-cf076343ff044ce8b57eb411a3104189.jpg)
Ascorbic Acid - Vitamin C
The form of ascorbic acid that is vitamin C is L-ascorbic acid. The chemical formula for ascorbic acid is C6H8O6.
Folic Acid
![This is the chemical structure of folic acid, also known as vitamin B9 or vitamin M.](https://www.thoughtco.com/thmb/I-Jb7ttEdvvhZWU-HgOyj4sUFxA=/1500x0/filters:no_upscale():max_bytes(150000):strip_icc()/folic_acid-58b5fc245f9b5860463e2da9.png)
Folic acid is also known as folacin or vitamin B9. It is often given as a supplement to pregnant women to help prevent neural tube defects. Folate deficiency leads to anemia.
Phenylalanine - Amino Acid
![This is the chemical structure of phenylalanine.](https://www.thoughtco.com/thmb/ctjwxM8y1PSe9YseMFb4C7RtYW0=/1500x0/filters:no_upscale():max_bytes(150000):strip_icc()/phenylalanine-58b5df4a5f9b586046f1151f.jpg)
Phenylalanine is an amino acid.
Cysteine - Amino Acid
![This is the chemical structure of cysteine.](https://www.thoughtco.com/thmb/meRgaakuNqO7ZHWwIdi-PpWagpY=/1500x0/filters:no_upscale():max_bytes(150000):strip_icc()/cysteine-58b5df665f9b586046f15da2.png)
Cysteine is an amino acid.
Glutamine - Amino Acid
![This is the chemical structure of glutamine.](https://www.thoughtco.com/thmb/NCeJp6hK1_wudTr4CTl4lIZ-o6w=/1500x0/filters:no_upscale():max_bytes(150000):strip_icc()/glutamine-58b5deae3df78cdcd8e047d7.png)
Glutamine is an amino acid.
Histidine - Amino Acid
![This is the chemical structure of histidine.](https://www.thoughtco.com/thmb/tKx-q1BnKO5IQiSGOnz8Q_fFlhk=/1500x0/filters:no_upscale():max_bytes(150000):strip_icc()/histidine-58b5deb15f9b586046ef9f1e.png)
Histidine is an amino acid.
Isoleucine - Amino Acid
![This is the chemical structure of isoleucine.](https://www.thoughtco.com/thmb/kqKF3hwvNAutqmJy1A6sIgfhniQ=/1500x0/filters:no_upscale():max_bytes(150000):strip_icc()/isoleucine-58b5df563df78cdcd8e1e62e.png)
Isoleucine is an amino acid.
Phenylalanine - Amino Acid
![This is the chemical structure of phenylalanine.](https://www.thoughtco.com/thmb/ctjwxM8y1PSe9YseMFb4C7RtYW0=/1500x0/filters:no_upscale():max_bytes(150000):strip_icc()/phenylalanine-58b5df4a5f9b586046f1151f.jpg)
Phenylalanine is an amino acid.
Asparagine - Amino Acid
![This is the chemical structure of asparagine.](https://www.thoughtco.com/thmb/vNZC0g21Bcgq5w9G0w8VLq2RLf8=/1500x0/filters:no_upscale():max_bytes(150000):strip_icc()/asparagine-58b5df6c3df78cdcd8e21fe5.png)
Asparagine is one of the amino acids.
Aspartic Acid - Amino Acid
Aspartic acid is one of the amino acids.
Glutamic Acid - Amino Acid
![This is the chemical structure of glutamic acid.](https://www.thoughtco.com/thmb/MOQvLYK48hpVDqIHyGE_2NxLNis=/1500x0/filters:no_upscale():max_bytes(150000):strip_icc()/gluamic_acid-58b5deaa5f9b586046ef8a5a.png)
Glutamic acid is an amino acid.
Methionine - Amino Acid
![This is the chemical structure of methionine.](https://www.thoughtco.com/thmb/bHaUjhM9oJsis0qJPmABz8ET4ec=/1500x0/filters:no_upscale():max_bytes(150000):strip_icc()/Methionine-58b5df4d5f9b586046f11df6.jpg)
Methionine is an amino acid.
Alanine - Amino Acid
![This is the chemical structure of alanine.](https://www.thoughtco.com/thmb/b1Wrqvn2oN_qYB-7tqiRO8qjRJE=/1500x0/filters:no_upscale():max_bytes(150000):strip_icc()/alanine-58b5df723df78cdcd8e22f8b.png)
Alanine is an amino acid.
Glycine - Amino Acid
![This is the chemical structure of glycine.](https://www.thoughtco.com/thmb/kB1VwKXsJZS6N9E82ysanCFyFgY=/1500x0/filters:no_upscale():max_bytes(150000):strip_icc()/glycine-58b5df5c3df78cdcd8e1f74d.jpg)
Glycine is an amino acid.
Tryptophan - Amino Acid
![This is the chemical structure of tryptophan.](https://www.thoughtco.com/thmb/Pxdnvfbb77fZ7jjtogtq1NHYKsI=/1500x0/filters:no_upscale():max_bytes(150000):strip_icc()/tryptophan-58b5de995f9b586046ef5efb.png)
Tryptophan is an amino acid.
Leucine - Amino Acid
![This is the chemical structure of leucine.](https://www.thoughtco.com/thmb/321ySyyOUOJzRhxM1Vzx4eay8ww=/1500x0/filters:no_upscale():max_bytes(150000):strip_icc()/leucine-58b5df533df78cdcd8e1de70.jpg)
Leucine is an amino acid.
Proline - Amino Acid
![This is the chemical structure of proline.](https://www.thoughtco.com/thmb/vr-QYshAxKoySuScOPIWrVm3y18=/1500x0/filters:no_upscale():max_bytes(150000):strip_icc()/proline-58b5df473df78cdcd8e1c00a.jpg)
Proline is an amino acid.
Serine - Amino Acid
![This is the chemical structure of serine.](https://www.thoughtco.com/thmb/CXNQIX6vN01hnPemM1mVAzgjxFg=/1500x0/filters:no_upscale():max_bytes(150000):strip_icc()/serine-58b5df443df78cdcd8e1b83e.jpg)
Serine is an amino acid.
Threonine - Amino Acid
![This is the chemical structure of threonine.](https://www.thoughtco.com/thmb/qMPxzqPgRvT6jlJTZKjYpl6pOQs=/1500x0/filters:no_upscale():max_bytes(150000):strip_icc()/threonine-58b5df403df78cdcd8e1af6b.jpg)
Threonine is an amino acid.
Lysine - Amino Acid
![This is the chemical structure of lysine.](https://www.thoughtco.com/thmb/CVmuY1vSSS6tb7jTa51K-xSNNj4=/1500x0/filters:no_upscale():max_bytes(150000):strip_icc()/lysine-58b5dec53df78cdcd8e081fb.png)
Lysine is an amino acid.
Arginine - Amino Acid
![This is the chemical structure of arginine.](https://www.thoughtco.com/thmb/VgsjAJgcjU82XNuQDyGzLnlSrBA=/1500x0/filters:no_upscale():max_bytes(150000):strip_icc()/arginine-58b5df6f5f9b586046f175f8.png)
Arginine is one of the amino acids.
Amino Acid General Structure
![This is the general structure of an amino acid.](https://www.thoughtco.com/thmb/Np_x1JwQeUzPwk97gOVEShS-odM=/1500x0/filters:no_upscale():max_bytes(150000):strip_icc()/amino_acid-58b5de935f9b586046ef51d1.png)
This is the general chemical structure for an amino acid.
Valine - Amino Acid
![This is the chemical structure of valine.](https://www.thoughtco.com/thmb/N01Ennj2FVlQBYp_P8LuIIU2eUw=/1500x0/filters:no_upscale():max_bytes(150000):strip_icc()/valine-58b5df313df78cdcd8e18a29.jpg)
Valine is an amino acid.
Tyrosine - Amino Acid
![This is the chemical structure of tyrosine.](https://www.thoughtco.com/thmb/NcO-RibAJAoOb3UfoJxFHOhxO3s=/1500x0/filters:no_upscale():max_bytes(150000):strip_icc()/Tyrosine-58b5df345f9b586046f0df23.jpg)
Tyrosine is an amino acid.
Hydrobromic Acid Structure
![This is the chemical structure of hydrobromic acid, HBr, one of the strong acids.](https://www.thoughtco.com/thmb/W7Pe7ktPShy0EQQi3qkL9gLQdwU=/1500x0/filters:no_upscale():max_bytes(150000):strip_icc()/hydrobromic-acid-58b5efba3df78cdcd81023ce.jpg)
Hydrobromic acid (HBr) is a strong acid.
Nitric Acid
![This is the chemical structure of nitric acid.](https://www.thoughtco.com/thmb/TqcQHlVm3mjIWTJo7hbW3ermLy0=/1500x0/filters:no_upscale():max_bytes(150000):strip_icc()/nitricacid-58b5fd325f9b58604641468a.png)
Nitric acid has the chemical formula HNO3.
Also known as: aqua fortis, azotic acid, engraver's acid, nitroalcohol
Carbonic Acid
![This is the chemical structure of carbonic acid.](https://www.thoughtco.com/thmb/UgdYeQvqjfarPSVtPKVeyOXUY-M=/1500x0/filters:no_upscale():max_bytes(150000):strip_icc()/carbonicacid-58b5fd2b3df78cdcd832162f.png)
The chemical formula for carbonic acid is CH2O3.
Carbonic acid is also known as: aerial acid, acid of air, dihydrogen carbonate, kihydroxyketone
Oxalic Acid
![This is the chemical structure of oxalic acid.](https://www.thoughtco.com/thmb/co_H5gN3leYxDBKWavtwEtW9sZQ=/1500x0/filters:no_upscale():max_bytes(150000):strip_icc()/oxalicacid-58b5fd295f9b586046412c55.png)
The chemical formula for oxalic acid is H2C2O4
Oxalic acid is also known as: ethanedioic acid, hydrogen oxalate, ethanedionate, acidum oxalicum, HOOCCOOH, oxiric acid.
Boric Acid
![This is the chemical structure of boric acid.](https://www.thoughtco.com/thmb/OqoTvO5lHEb90k89WRpJOvdhOx8=/1500x0/filters:no_upscale():max_bytes(150000):strip_icc()/boricacid-58b5fd255f9b586046412008.png)
Boric acid has a chemical formula of H3BO3
Boric acid is also known as: acidum boricum, hydrogen orthoborate