Ammonia is a compound composed of nitrogen and hydrogen. It can be synthesized from pure ammonia, NH3, and hydrogen, H2. This is done through the process of hydrolysis, breaking down molecules with water.
Ammonia is a weak base due to the nitrogen in it. Like any other compound with a base, ammonia can accept hydrogen ions, H+). Due to this property, it can be dissolved in water.
When ammonia is dissolved in water, it forms two types of crystals: hexagonal and rhombic prisms. These crystals are very reflective due to the smooth surfaces of the prisms and the sharp edges of the hexagons. This makes it a useful cleaning agent.
Ammonia has many uses due to its low cost and effectiveness. Some common uses include fertilizers, household cleaners, and industrial products.
How is it made?
Ammonia is commercially made through the process of hydrogenation. Hydrogen and nitrogen are combined in a reaction that uses a catalyst and pressure to make ammonia.
The most common catalyst is platinum, which is why commercial production of ammonia uses platinum as a cost effective ingredient.
Other catalysts include ruthenium and osmium, though these are much more rare. Because of this, less expensive sources of ammonia do not use a catalyst, but instead use another chemical to promote the reaction.
Ammonia can also be synthesized from agricultural products such as corn or soybeans. This is an inexpensive way to produce ammonia for industrial use.
What is its structure?
Ammonia is a compound composed of nitrogen and hydrogen. It has one nitrogen atom bonded to three hydrogen atoms, making it a diatomic molecule.
Ammonia is a polar compound, which means that the nitrogen atom carries a slight negative charge while the hydrogen atoms carry a slight positive charge. This is due to the asymmetric structure of the nitrogen atom.
Because of this polarity, ammonia has pH-dependent effects. When dissolved in water, it has a mildly alkaline effect due to its dissociation into ammonium and hydronium ions.
These ions are not very strong, however, so any significant amount of ammonia must be diluted in water before it can neutralize water acidity. Its Kb value of 1.8×10−5 indicates how weak of a base it is.
What is its pKa?
Ammonia has a pKa of 9. This means that at a pH of 9, ammonia is 100% ionized. At any other pH, it will be less ionized, depending on the pH.
At a pH less than 9, ammonia will be negatively charged (anion). At a pH greater than 9, ammonia will be neutral (no charge). At a pH of 9, it will be neither anion nor cation; it will be ammonium.
Because ammonia is a weak base, at high concentrations it can act like an acid. This is because there are now free NH3+ ions in solution, so it can accept hydrogen ions from something like sodium bicarbonate (a baking soda solution).
Ammonia can also act as an acid in vivo due to buffering mechanisms within the body. These mechanisms help control the concentration of internal fluids such as blood and cerebrospurpleus fluid.
How does it react?
Ammonia is a weak base, which means it will only partially dissociate in water. It will form an ammonium cation and a hydronium ion when placed in water.
Ammonium cations are formed when ammonia reacts with water. The ammonium cation is the NH4+ ion, and it is then called an ammonium compound.
The formation of the ammonium cation and hydronium ion from ammonia occurs when both molecules are present in water. This reaction happens because of the difference in charge between the two compounds. The ammonia molecule is neutral, thus it can react with either a positive or negative ion.
Ammonia can also react with other chemicals to form different compounds depending on what chemical it reacts with.
Ammonia and water
Ammonia can form weak bonds with water molecules, forming a solution called ammonium hydroxide. This solution is called ammonia in its concentrated form.
Ammonia solutions with a concentration of at least 5% are called ammonia solutions. These solutions are usually produced in industrial settings, while household ammonia is usually a less concentrated solution.
Ammonia can be easily purified by passing it through a series of cooling tubes containing distilled water. The water acts to dissolve the ammonium hydroxide, and it can then be collected and reused.
This process is known as de-watering and is an effective way to reuse the material. It is also cost-efficient and efficient in reusing the material. De-watering also has environmental impacts, as it reduces waste that would otherwise be disposed of.
Ammonia and sodium hydroxide
Ammonia can react with sodium hydroxide, better known as household laundry detergent. This reaction occurs in water, producing an ammonium and sodium chloride, better known as table salt.
Ammonia is a weak base and reacts with acids to form salts and water. This reaction is known as neutralization and is used in the manufacturing of household ammonia.
Acids must be in a higher concentration than ammonia for a reaction to occur. This is why when putting down household ammonia, it must be in high concentration or it will decompose by reacting with the soil around it. It does not react with soil itself, only what is inside of it.
Ammonia and sodium chloride
Another interesting property of ammonia is its ability to act as a weak base. Because ammonia is composed of one nitrogen and three hydrogen atoms, it can accept one hydrogen ion (proton).
Ammonia can be dissolved in water, which is why it is often studied in relation to fish. When fish are exposed to too much ammonia in the water, it can detect it as a base and try to neutralize it.
Ammonia can be produced by decomposing animal waste. This is why studies on ammonia in the water often reference agricultural runoff as a source. It can also be produced by chemical reactions involving nitrogen compounds.
When ammonia in the water is detected, fish can attempt to neutralize it by exchanging an ammonium ion for a sodium ion, creating sodium ammonium nitrate. This compound is less harmful to the fish.
Ammonia and copper(II) sulfate
A interesting and important reaction involving ammonia is its reaction with copper(II) sulfate. This reaction is used to determine the concentration of ammonia in a solution.
Ammonia is a weak base and copper(II) sulfate is an ionic compound consisting of copper ions and sulfur ions. Copper(II) sulfate has a crystal structure and is colorless and odorless.
When these two compounds are mixed, a blue-green solution is formed. This solution is called litmus, named after the plant it color-changes from, and it consists of copper(II) sulfate crystals immersed in water.
When ammonia reacts with litmus, a white precipitate of ammonium ion is formed. Further analysis can determine the concentration of ammonia in a solution using this precipitate (Lucky, n.d.).
Leave a Reply