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Precipitation of Ions03:11

Precipitation of Ions

Predicting Precipitation
The equation that describes the equilibrium between solid calcium carbonate and its solvated ions is:
Formation of Complex Ions03:45

Formation of Complex Ions

A type of Lewis acid-base chemistry involves the formation of a complex ion (or a coordination complex) comprising a central atom, typically a transition metal cation, surrounded by ions or molecules called ligands. These ligands can be neutral molecules like H2O or NH3, or ions such as CN− or OH−. Often, the ligands act as Lewis bases, donating a pair of electrons to the central atom. These types of Lewis acid-base reactions are examples of a broad subdiscipline called coordination...
2° Amines to N-Nitrosamines: Reaction with NaNO201:20

2° Amines to N-Nitrosamines: Reaction with NaNO2

Secondary amines react with nitrous acid to form N-nitrosamines, as depicted in Figure 1. Nitrous acid, a weak and unstable acid, is formed in situ from an aqueous solution of sodium nitrite and strong acids, such as hydrochloric acid or sulfuric acid, in cold conditions. In the presence of an acid, the nitrous acid gets protonated. The subsequent loss of water results in the formation of the electrophile known as nitrosonium ion.
Precipitation Titration Curve: Analysis01:21

Precipitation Titration Curve: Analysis

The precipitation titration curve demonstrates the change in concentration of one reactant with the volume of titrant added. During the titration of chloride ions with silver nitrate, the precipitation titration curve is divided into three regions: before, at, and after the equivalence point. Before the equivalence point, low redissolution of the sparingly soluble silver chloride precipitate gives a low silver ion concentration. However, in the second region, representing the equivalence point,...
Chemical Reactions in Aqueous Solutions03:03

Chemical Reactions in Aqueous Solutions

Chemical substances interact in many different ways. Certain chemical reactions exhibit common patterns of reactivity. Due to the vast number of chemical reactions, it becomes necessary to classify them based on the observed patterns of interaction.
1° Amines to Diazonium or Aryldiazonium Salts: Diazotization with NaNO2 Overview01:26

1° Amines to Diazonium or Aryldiazonium Salts: Diazotization with NaNO2 Overview

Nitrous acid and nitric acids are two types of acids containing nitrogen, among which nitrous acid is weaker than nitric acid. Nitrous acid with a pKa value of 3.37 ionizes in water to give a nitrite ion and the hydronium ion.
The nitrous acid is unstable. Hence, it is formed in situ from a solution of sodium nitrite and cold aqueous acids such as hydrochloric or sulfuric acid. In an acidic solution, the –OH group of nitrous acid undergoes protonation to give oxonium ion, followed by water loss...

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Related Experiment Video

Updated: Jun 1, 2026

Preparation of Silver-Palladium Alloyed Nanoparticles for Plasmonic Catalysis under Visible-Light Illumination
11:16

Preparation of Silver-Palladium Alloyed Nanoparticles for Plasmonic Catalysis under Visible-Light Illumination

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Bis(2-amino-pyridine-κN)silver(I) nitrate.

Hoong-Kun Fun, Jain John, Samuel Robinson Jebas

    Acta Crystallographica. Section E, Structure Reports Online
    |May 18, 2011
    PubMed
    Summary

    This study reveals the crystal structure of a silver(I) compound with 2-aminopyridine ligands. The structure features linear coordination around silver atoms and a 2D network formed by hydrogen bonds.

    Area of Science:

    • Coordination Chemistry
    • Crystallography
    • Supramolecular Chemistry

    Background:

    • Silver(I) complexes are of interest due to their diverse coordination geometries and applications.
    • 2-aminopyridine is a versatile ligand capable of forming coordination complexes.
    • Understanding crystal packing and intermolecular interactions is crucial for materials design.

    Purpose of the Study:

    • To elucidate the crystal structure of the [Ag(2-aminopyridine)2]NO3 complex.
    • To characterize the coordination environment around the silver(I) ions.
    • To investigate the hydrogen bonding network within the crystal lattice.

    Main Methods:

    • Single-crystal X-ray diffraction was employed to determine the molecular and crystal structure.
    • Analysis of bond lengths, angles, and intermolecular interactions (hydrogen bonds) was performed.

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  • The crystallographic inversion centers and their impact on the asymmetric unit were identified.

    • Main Results:

    • The asymmetric unit contains partial cations and anions, with inversion centers generating full units.
    • Silver(I) ions exhibit linear bicoordination with nitrogen atoms from two 2-aminopyridine ligands.
    • A two-dimensional network is formed via N-H⋯O and C-H⋯O hydrogen bonds between cations and nitrate anions.

    Conclusions:

    • The crystal structure of [Ag(2-aminopyridine)2]NO3 is characterized by linear silver(I) coordination and extensive hydrogen bonding.
    • The hydrogen bonding network plays a significant role in stabilizing the two-dimensional supramolecular architecture.
    • This structural insight contributes to the understanding of silver coordination complexes and their solid-state properties.