Ammonia Addition
Ammonia Addition - Related Videos
08:14
Ammonia Synthesis at Low Pressure
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Cited by 17 •
2017
Ammonia can be synthesized at low pressure by using a conventional catalyst and an ammonia selective absorbent.
06:27
Fast and Accurate Exhaled Breath Ammonia Measurement
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Cited by 16 •
2014
Ammonia is an important physiologic metabolite relevant to various disease and wellness states. It is also a difficult molecule to measure in breath, which demands particular precautions be taken to obtain accurate results. Not all factors influencing ammonia are known, but progress can be difficult without accounting for these factors.
01:27
Conjugate Addition (1,4-Addition) vs Direct Addition (1,2-Addition)
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2025
α,β-Unsaturated carbonyl compounds with two electrophilic sites, the carbonyl carbon, and the β carbon, are susceptible to nucleophilic attack via two modes: conjugate or 1,4-addition and direct or 1,2-addition. Conjugate addition results in a thermodynamically stable product. The reaction retains the stronger C=O bond at the expense of the weaker C=C π bond. The process is slow as the β carbon is less electrophilic than the carbonyl carbon. Direct addition products are formed faster owing to...
01:08
Conjugate Addition of Enolates: Michael Addition
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2023
The attack of a nucleophile at the β carbon of an α,β-unsaturated carbonyl compound is called conjugate addition. Conjugate addition reactions of active methylene compounds, such as β-diketones, β-keto esters, β-keto nitriles, and α-nitro ketones, are called Michael addition reactions. The reaction is catalyzed by a base that abstracts the acidic methylene hydrogen, generating a doubly-stabilized enolate ion that serves as the nucleophile or the Michael donor. The base employed depends on the...
12:05
Preparation of Hydrophobic Metal-Organic Frameworks via Plasma Enhanced Chemical Vapor Deposition of Perfluoroalkanes for the Removal of Ammonia
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Cited by 15 •
2013
Herein the procedures for plasma enhanced chemical vapor deposition of perfluoroalkanes on microporous materials such as metal-organic frameworks to enhance their stability and hydrophobicity are described. Furthermore, breakthrough testing of milligram quantities of samples is described in detail.
FAQs
Ammonia accepts protons from water or other acidic species, producing ammonium and hydroxide ions. This proton-transfer behavior can raise the solution’s basicity, but the resulting pH depends on the ammonia concentration and the existing chemical environment. Monitoring pH therefore helps chemists determine whether the addition has produced the intended acid–base condition.
Ammonia can coordinate with metal ions, forming soluble ammine complexes. This coordination changes the composition of the solution and may alter how the metal behaves in precipitation or qualitative-analysis reactions. Observing changes in solubility or solution color can therefore provide evidence that metal coordination has occurred.
These variables influence how ammonia distributes through the system and how strongly it changes acidity or coordination behavior. Concentration and pH affect the chemical balance, while temperature and mixing influence the conditions experienced throughout the solution. Controlling them improves reproducibility and helps distinguish intended chemical changes from uneven or poorly regulated addition.
A controlled approach sets the intended amount and addition rate, introduces ammonia while maintaining effective mixing, and evaluates the resulting pH, color, solubility, or composition. The amount and rate should be adjusted according to the desired chemical response. This procedure helps regulate reaction conditions and supports clearer interpretation of the observed outcome.
In qualitative analysis, ammonia addition can help reveal differences in precipitation behavior and metal-ion coordination. Changes in solubility, color, or solution composition may indicate that the added ammonia has altered the chemical environment. Because the response depends on pH, concentration, and mixing, controlled addition is important when comparing observations between samples.
The method supplies ammonia as a ligand, meaning a species that coordinates with a metal ion, while also modifying the solution’s acidity. Chemists can use these combined effects to study ammine-complex formation, regulate precipitation, or adjust conditions during synthesis. The resulting changes in composition, color, or solubility help assess the reaction’s progress and selectivity.