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Qualitative Analysis

Qualitative Analysis

For solutions containing mixtures of different cations, the identity of each cation can be determined by qualitative analysis. This technique involves a series of selective precipitations with different chemical reagents, each reaction producing a characteristic precipitate for a specific group of cations. Metal ions within a group are further separated by varying the pH, heating the mixture to redissolve a precipitate, or adding other reagents to form complex ions.
For instance, group IV...

Synthesis and Decomposition Reactions

Synthesis and Decomposition Reactions

Synthesis and decomposition are two types of redox reactions. Synthesis means to make something, whereas decomposition means to break something. The reactions are accompanied by chemical and energy changes.

Electron Configuration of Multielectron Atoms

Electron Configuration of Multielectron Atoms

The alkali metal sodium (atomic number 11) has one more electron than the neon atom. This electron must go into the lowest-energy subshell available, the 3s orbital, giving a 1s22s22p63s1 configuration. The electrons occupying the outermost shell orbital(s) (highest value of n) are called valence electrons, and those occupying the inner shell orbitals are called core electrons. Since the core electron shells correspond to noble gas electron configurations, we can abbreviate electron...

Alkali Metals

Alkali Metals

Group 1 elements are soft and shiny metallic solids. They are malleable, ductile, and good conductors of heat and electricity. The melting points of the alkali metals are unusually low for metals and decrease going down the group, while the density increases going down the group with the exception of potassium (Table 1).
Table 1: Properties of the alkali metals

Ionic Crystal Structures

Ionic Crystal Structures

Ionic crystals consist of two or more different kinds of ions that usually have different sizes. The packing of these ions into a crystal structure is more complex than the packing of metal atoms that are the same size.
Most monatomic ions behave as charged spheres, and their attraction for ions of opposite charge is the same in every direction. Consequently, stable structures for ionic compounds result (1) when ions of one charge are surrounded by as many ions as possible of the opposite...

Phosphate Buffer

Phosphate Buffer

The phosphate buffer system is a critical biological mechanism for maintaining pH stability in the body. This system operates primarily through two components: sodium dihydrogen phosphate (NaH2PO4), which acts as a weak acid, and sodium hydrogen phosphate (Na2HPO4), which serves as a weak base.
Sodium dihydrogen phosphate does not fully dissociate in neutral or acidic solutions. When a strong base, such as sodium hydroxide (NaOH), is introduced into the solution, sodium dihydrogen phosphate...

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Related Experiment Video

Updated: May 27, 2026

Combining Solid-state and Solution-based Techniques: Synthesis and Reactivity of Chalcogenidoplumbates(II or IV)

Combining Solid-state and Solution-based Techniques: Synthesis and Reactivity of Chalcogenidoplumbates(II or IV)

Published on: December 29, 2016

A new langbeinite-type phosphate: K(2)AlSn(PO(4))(3).

Hai-Yan Li¹, Dan Zhao

¹Department of Physics and Chemistry, Henan Polytechnic University, Jiaozuo, Henan 454000, People's Republic of China.

Acta Crystallographica. Section E, Structure Reports Online

|November 8, 2011

Summary

Single crystals of dipotassium aluminium tin tris-phosphate were synthesized. This novel phosphate framework features disordered aluminum and tin atoms, forming a 3D structure with potassium ions in large cavities.

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Combining Solid-state and Solution-based Techniques: Synthesis and Reactivity of Chalcogenidoplumbates(II or IV)

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Published on: December 29, 2016

Preparation and Reactivity of a Triphosphenium Bromide Salt: A Convenient and Stable Source of Phosphorus(I)

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Synthesis of High Purity Nonsymmetric Dialkylphosphinic Acid Extractants

Synthesis of High Purity Nonsymmetric Dialkylphosphinic Acid Extractants

Published on: October 19, 2017

Area of Science:

Solid-state chemistry
Inorganic crystal structure analysis
Materials science

Background:

Phosphate compounds exhibit diverse structural motifs and properties.
Aluminum and tin phosphates are of interest for their potential applications.

Purpose of the Study:

To synthesize and characterize single crystals of dipotassium aluminium tin tris-phosphate, K(2)AlSn(PO(4))(3).
To elucidate the crystal structure and atomic arrangement of this novel compound.

Main Methods:

High-temperature synthesis in a platinum crucible.
Single crystal X-ray diffraction analysis.

Main Results:

Successful synthesis of K(2)AlSn(PO(4))(3) single crystals.
Determination of a 3D framework structure composed of vertex-sharing Al/SnO(6) octahedra and PO(4) tetrahedra.
Identification of occupational disorder where Al(III) and Sn(IV) atoms share the same crystallographic site in a 1:1 ratio.
Localization of potassium ions within large cavities, coordinated by 12 oxygen atoms.

Conclusions:

The study reveals a novel 3D framework structure for K(2)AlSn(PO(4))(3) with significant Al/Sn occupational disorder.
The crystal structure provides insights into the formation and stability of mixed-metal phosphates.
This work contributes to the understanding of complex phosphate materials.