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Related Concept Videos

Ions as Acids and Bases02:54

Ions as Acids and Bases

22.7K
Salts with Acidic Ions
Salts are ionic compounds composed of cations and anions, either of which may be capable of undergoing an acid or base ionization reaction with water. Aqueous salt solutions, therefore, may be acidic, basic, or neutral, depending on the relative acid-base strengths of the salt’s constituent ions. For example, dissolving the ammonium chloride in water results in its dissociation, as described by the equation:
22.7K
Titration of a Weak Base with a Strong Acid01:20

Titration of a Weak Base with a Strong Acid

9.1K
The titration curve of a weak base like ammonia with a strong acid like hydrochloric acid is the mirror image of the titration curve of a weak acid with a strong base.
Using the ICE table and substituting the Kb value, we calculate the initial pH of 50 mL of 0.1 M ammonia to be 11.11. Addition of 25 mL of 0.1 M hydrochloric acid to this solution of ammonia results in a buffer with an equal concentration of ammonia and ammonium ions. The pH of this buffer can be calculated by substituting these...
9.1K
EDTA: Auxiliary Complexing Reagents01:26

EDTA: Auxiliary Complexing Reagents

1.6K
EDTA titrations are usually carried out in highly basic conditions, where the fully deprotonated form of EDTA, Y4−, actively complexes with the free metal ions in the solution. Several metal ions precipitate as hydrous oxide (hydroxides, oxides, or oxyhydroxides) under these conditions, lowering the concentration of free metal ions in the solution. For this reason, auxiliary complexing agents or ligands such as ammonia, tartrate, citrate, or triethanolamine are used in EDTA titrations to...
1.6K
Qualitative Analysis03:46

Qualitative Analysis

21.9K
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...
21.9K
Weak Base Solutions03:21

Weak Base Solutions

19.7K
Some compounds produce hydroxide ions when dissolved by chemically reacting with water molecules. In all cases, these compounds react only partially and so are classified as weak bases. These types of compounds are also abundant in nature and important commodities in various technologies. For example, global production of the weak base ammonia is typically well over 100 metric tons annually, being widely used as an agricultural fertilizer, a raw material for chemical synthesis of other...
19.7K
Structure of Amines01:19

Structure of Amines

2.5K
The hybridized nitrogen atom in amines possesses a lone pair of electrons and is bound to three substituents with a bond angle of around 108°, which is less than the tetrahedral angle of 109.5°. However, the C–N–H bond angle is slightly larger at 112°, with a carbon–nitrogen bond length of 147 pm. This carbon–nitrogen bond length of of amines is longer than the carbon–oxygen bond of alcohols (143 pm) but shorter than alkanes’...
2.5K

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Synthesis of Cationized Magnetoferritin for Ultra-fast Magnetization of Cells
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α-NH4Fe(HAsO4)2.

Najoua Ouerfelli1, Amira Souilem1, Mohamed Faouzi Zid1

  • 1Laboratoire de Matériaux et Cristallochimie, Faculté des Sciences de Tunis, Université de Tunis ElManar, 2092 Manar II Tunis, Tunisia.

Acta Crystallographica. Section E, Structure Reports Online
|June 19, 2014
PubMed
Summary
This summary is machine-generated.

Researchers synthesized a novel ammonium iron arsenate compound, α-NH4Fe(HAsO4)2, featuring a 3D framework with channels suitable for ion exchange applications. Its structure is related to similar phosphate compounds.

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Area of Science:

  • Inorganic Chemistry
  • Crystal Engineering
  • Materials Science

Background:

  • The synthesis and structural characterization of novel inorganic compounds are crucial for developing new materials.
  • Isostructural relationships can provide insights into structure-property correlations.
  • Framework materials with open channels are of interest for ion exchange and catalysis.

Purpose of the Study:

  • To synthesize and characterize a novel ammonium iron arsenate compound.
  • To investigate its crystal structure and potential applications.
  • To explore its structural relationship with known compounds.

Main Methods:

  • Hydrothermal synthesis of α-NH4Fe(HAsO4)2.
  • Single-crystal X-ray diffraction for structural determination.
  • Analysis of coordination polyhedra distortion and hydrogen bonding.

Main Results:

  • The compound α-NH4Fe(HAsO4)2 was successfully synthesized hydrothermally.
  • It is isostructural with NH4Fe(HPO4)2, forming a 3D framework with interconnected channels.
  • Ammonium cations reside within these channels, indicating potential for ion exchange.

Conclusions:

  • The synthesized compound possesses a unique 3D framework structure.
  • The presence of channels and exchangeable ammonium ions suggests potential applications in ion exchange.
  • Further studies are warranted to explore its functional properties.