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Urea is a nitrogenous substance produced in the liver. Its chemical formula is CH4N2O. Ureophil and Carbamide are other names for it. This compound is the last byproduct of protein metabolism. It serves no physiological purpose and is a waste. It dissolves in blood and is eliminated by the kidneys in urine. Urea is non-toxic and dissolves in water. It has no colour and no scent. It is frequently employed in fertilizers and is utilized widely as a crucial raw ingredient in industries.
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Key Terms: Urea, Fertilizers, Urine, Water, Oxygen, Kidney, Hydrogen, Kidneys, Carbonyl Functional Group
Origin and Synthesis of Urea
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French chemist Hilaire Marin Rouelle first distinguished between urine and urea in 1773. German chemist Friedrich Wohler began the official production of ammonium cyanate later in 1828. This procedure is recognised as a lab synthesis of this organic molecule from all the inorganic components.
Then, commercially manufactured urea is produced in greater quantities using both liquid ammonia and liquid carbon dioxide. These substances combine at high pressure and temperature to make ammonium carbamate, which breaks down at a lower pressure to produce water and urea.
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| Ammonium Nitrate | Nitro Compounds | Ammonification |
| Methane | Nitrogen Fixation | Manure and Fertilizers |
| Nitrogen Cycle | Uses of Formaldehyde | Polymerization |
Structure of Urea
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The body's waste material urea has no physiological use. Before it is eliminated as urine, it disintegrates in the kidney and circulation. The carbonyl functional group connects the two distinct NH2 groups that make up the chemical molecule urea. Because urea is non-toxic, it dissolves in water. It has no colour, and it doesn't even have a fragrance.
The carbonyl group is joined by two amide groups in urea. This is how the name carbamide, which is made up of carboxylic and amide, came to be. When a carbon atom and an oxygen atom are double bonded, the result is a carbonyl group. A nitrogen atom is joined to two distinct hydrogen atoms to form an amide group.
Structure of Urea
Read More: Test for Presence of Urea in Urine
How is Urine Made?
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The body's three main excretory organs are the kidneys, lungs, and skin. They are the sole organs that can expel poisons and poisonous substances from the body, in other words. Excess carbon dioxide must be eliminated by the lungs, whereas excess salt and water must be eliminated by the skin.
On the other side, the kidneys also flush out extra water, salt, and urea. When dietary proteins are broken down into amino acids during digestion, urea is created, which is then transported to the liver. The liver transforms all the extra acids into ammonia, which is then changed into the less harmful compound urea.
Features of Urea
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Here are a few important features of urea:
- Nitrogen, carbon, and oxygen make up urea. It is present in the milk, blood, and sweat of mammals, as was previously described.
- It becomes urine when it is concentrated. In its simplest form, urea is a crystalline substance with a nitrogen concentration of roughly 46% when dry.
- In the US, urea is processed annually at a rate of about 1 million pounds. The majority of it is utilized in fertilizers to make the water-soluble in nitrogen content.
- Additionally, urea is utilized in the manufacture of plastics, glues, animal food, pricey commercial goods, and explosive components.
Properties of Urea
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Some important properties of Urea are listed below:
| Chemical Formula | CH4N2O |
| Molecular Weight/ Molar Mass | 60.06 g/mol |
| Density | 1.32 g/cm3 |
| Appearance | White solid |
| Melting Point | 133 °C |
Read More: Uremia
Uses of Urea
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The following are some uses for urea:
- Agriculture: Fertilizer that releases nitrogen is where more than 90% of industrial urea is used worldwide. Of all the solid fertilizers that include nitrogen, urea has the largest nitrogen content. The lowest transportation costs per unit of nitrogen fertilizer are consequently associated with urea.
- Chemical Industry: The production of urea serves as a raw ingredient for the two primary material groups. These compounds are also used in marine plywood, including urea-urea-formaldehyde resins and urea-melamine-formaldehyde.
- Explosives: Urea aids in the production of urea nitrate. Additionally, urea nitrate is a powerful explosive that is used on a regular basis in the industry. Additionally, it is a component of a homemade explosive device. Additionally, it serves as an explosive stabilizer in nitrocellulose.
- Automobiles: Urea is used in SNCR and SCR processes in automobiles to minimize the NOx emissions in exhaust gases. Additionally, the combustion of diesel, diesel fuel, and natural gas engines contributes to the release of these exhaust gases.
- Uses in laboratories: Urea can be a potent protein denaturant, making it valuable for use in laboratories. This is due to the fact that it shatters the proteins' non-covalent linkages. Above all, this characteristic contributes to some proteins' increased solubility.
Urea Fertilizer
Read More: Soil Fertility And Replenishment Nutrients
Things to Remember
- The term "urea" refers to a chemical substance also known as "carbamide." Additionally, the chemical formula of urea is CH4N2O.
- In the body, urea serves only as a waste product with no physiological use. Prior to being expelled as urine, it dissolves in the kidney and blood.
- When dietary proteins are broken down into amino acids during digestion, urea is created, which is then transported to the liver. The liver transforms all the extra acids into ammonia, which is then changed into the less harmful compound urea.
- In its simplest form, urea is a crystalline substance with a nitrogen concentration of roughly 46% when dry.
- Urea serves as a fertilizer with nitrogen release. It serves as a stabilizer in explosives made of nitrocellulose. It is a crucial reagent in lanthanide chemistry. It is employed in the production of powerful explosives, such as urea nitrate.
Sample Questions
Ques. What functions does urea serve? (3 Marks)
Ans. Carbamide is another name for urea, the carbonic acid diamide. This substance has the chemical formula CH4N2O. Urea is a vital ingredient in fertilizer and feed, as well as a raw material for the production of polymers and pharmaceuticals. The removal of two waste products, ammonia and CO2, as well as the control of blood pH are all made possible by urea.
Ques. What effects does urea have on the skin? (3 Marks)
Ans. In small doses, the nitrogen molecule urea helps the skin by binding water and gently exfoliating it. Higher doses of it can exfoliate the skin, but larger amounts can also irritate the skin. Other cosmetic chemicals may become more skin-absorbent when combined with urea.
Ques. How long does it take urea in fertilizer to start working? (3 Marks)
Ans. You won't be able to see any reaction if the soil is dry. However, urea hydrolysis transforms into carbon dioxide and ammonium with the help of urease and soil moisture. On high pH soils, the entire process typically takes 2-4 days. But before applying urea to the soil, one must take precautions. A soil test must be done first to make things simpler.
Ques. Where does the body make urea? (3 Marks)
Ans. The liver is where urea is predominantly made, and blood is subsequently used to transport it throughout the body. A metabolite (a byproduct of the breakdown of amino acids), urea, is formed in the liver. When amino acids are broken down, ammonium ions are produced. In the production of nitrogen molecules, some are utilized. Ammonium ions in excess are changed into urea.
Ques. Why does urea make a weak base? (3 Marks)
Ans. The explanation is that the lone pair in urea does not participate in any resonance because it is freely available. However, in any regular amide, the lone pair is conjugated to the residue and prevented from donating electrons, making it a weaker base than urea. Two nitrogen atoms in urea have two lone pairs of electrons.
Ques. How is synthetic urea produced? (5 Marks)
Ans. Urea was first produced artificially in 1828 thanks to a scientific discovery involving inorganic substances. Ammonia and carbon dioxide are combined to create the chemical compound urea in a high-pressure, high-temperature reactor (Ammonium Carbamide).
The chemical is subsequently further dehydrated by the heat, forming the crystalline substance urea. Because of its high nitrogen content and simplicity of conversion to ammonia in the soil, urea is one of the most concentrated nitrogenous fertilizers. It is a cheap material that can be sprayed on foliage, added directly to the soil, or used in mixed fertilizers.
Ques. Explain urea in a human body. (3 Marks)
Ans. The majority of living things produce the waste material urea, also known as carbamide. The primary organic substance in human urine is this substance. Ammonia is converted by the liver into urea, a non-toxic chemical that may be safely transported in the blood to the kidneys where it is excreted in the urine.
Ques. What is a high level of urea, describe its symptoms and the food that causes high urea. (5 Marks)
Ans. Generally speaking, a range of 6 to 24 mg/dL (2.1 to 8.5 mmol/L) is regarded as normal. However, typical ranges can change depending on your age and the lab's reference range. Inquire about your results from your doctor. With age, urea nitrogen levels often rise.
Uremia symptoms include
- Cognitive impairment (problems with thinking and remembering).
- Fatigue.
- Breathing difficulty brought on by fluid retention.
- Decrease in appetite.
- Muscle pain.
The foods that raise urea levels are dark-coloured food, Avocados, Canned Foods, Whole wheat bread, Brown Rice, Bananas, Dairy, Oranges, Processed meats, and Pickles.
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