Many ligands are a combination of donor types, but the “pure” donor diagrams can be considered as;
Related Questions;
Sunday, November 29, 2020
Saturday, November 28, 2020
What are the inverse spinel structures?
INVERSE SPINEL STRUCTURE (Fe3O4-Magnetite):
In Fe3O4, Fe+2 and Fe+3 ions are present in the ratio 2:1. it may be considered as having composition FeO.Fe2O3. In Fe3O4 Oxide arranged in ccp. Fe+2 ions occupy octahedral voids while Fe+3 ions are equally distributed between octahedral and tetrahedral voids
MgFe2O4 also has structure similar to magnetite. In this Mg+2 ions are present in place of Fe+2 ion in Fe3O4. Magnetite has inverse spinet structure.
Related questions;
What are the normal spinel structures?
NORMAL SPINEL (AB2O4 )
STRUCTURE:
Example of Spinel is a MgAl2O4.( mineral) In it oxide ions (O-2) are arranged in ccp with Mg+2 ions occupying tetrahedral voids and Al+3 ions in a set of octahedral voids.
Many ferrites (such as ZnFe2O4) also possess spinel structure. These are very
important magnetic materials and are used in telephone and memory loops in
computers.
Friday, November 27, 2020
Law of Isomorphism
When two or more compound forms similar type of crystals or able to form mixed crystals, they are known as isomorphs. For examples:MgSO4.7H2O, ZnSO4.7H2O and FeSO4.7H2Oare isomorphs of each other as their crystals posses same shape.
According to Mitscherlich [year 1819]. The valency of elements that are similarly placed to that of other elements in their isomorphs are always same.
In the above example Fe, Zn and Mg have same valency [2] and equal ratio of water molecule in each isomorphs.
If equivalent mass of one element is known then atomic mass can be calculated by knowing the valency of other isomorphs key element.
ILLUSTRATIVE EXAMPLE(4): Which pair of the following substances is said to be isomorphous?
(A) White vitriol and blue vitriol
(B) Epsom salt and Glauber's salt
(C) Blue vitriol and Glauber's salt
(D) White vitriol and Epsom salt
SOLUTION:
Epsom salt (MgSO4.7H2O) and White vitriol
(ZnSO4.7H2O) contains divalent cation
Mg2+ and Zn2+ and same number of
water molecules as water of crystallization
which hold criteria for isomorphism. Hence (D) is correct.
Friday, November 20, 2020
What are the chemical formula and chemical name of Red Vitriol?
The chemical formula of Red Vitriol is CoSO4.xH2O (x=7) and chemical name is Cobalt sulphate.
Related Questions;
Subscribe to:
Posts (Atom)