Questions tagged [ionic-compounds]
Compounds in which at least some of bonds have ionic character stronger than covalent or metallic. Many compounds called salts are ionic compounds but not all of them.
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What are the limitations of the Born-Lande' equation?
The Born-Lande' equation is used to theoretically calculate the lattice energy, $\Delta U$, of ionic compounds. It is often cited as such in literature,
$$\Delta U = -\frac{k_Az_1z_2Me^2}{4 \pi \...
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Why does beryllium have an exceptionally high hydration energy?
You would expect solubility of Group $2$ fluorides to increase down the group, as lattice energy plummets much more sharply than hydration energy does. For the most part, this is true: $\ce{BaF2}$ is ...
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Chemistry of Rutile, CdCl2 and CdI2
During lectures, we were told that 3d transition metal fluorides generally prefer a rutile structure. Chlorides prefer a $\ce{CdCl2}$ structure where $\ce{Cl-}$ adopt a CCP lattice and the metal ...
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Gap in ionic radii
The above picture was shown in a presentation by my prof in inorganic chem as we were discussing ionic radii more in depth (all in pm). These are all isoelectronic radii. Notice the sudden leap in ...
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What type of bonding is present in lithium tetrahydridoaluminate?
I can tell that the negative ion has one bond which is a co-ordinate/dative covalent bond.
However, overall, would you say that lithium tetrahydridoaluminate (lithium aluminium hydride) is ionic? If ...
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How can I transform Thiamine sulfate to Thiamine hydrochloride?
I have got thiamine sulfate and want to have thiamine hydro chloride. Can I obtain it by dissolving thiamine sulfate in water and adding calcium chloride water solution as long as calcium sulfate will ...
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Calculating the ionic strength of a histidine solution
I'm trying to repeat the calculation of the ionic strength of a solution containing histidine as a buffer I recently read in a paper. In their paper, the authors calculate the ionic strength of a 20 ...
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Expression comparing the Solubility of Ionic compounds
In chemical bonding, I am taught an expression that compares the Solvation Energy and the Lattice Energy of an ionic compound which is being dissolved in a polar solvent (could be water, could be ...
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why does lithium fluoride have a higher lattice energy than lithium iodide?
Based on my knowledge, lattice energy is proportional to the multiplication of the charge of the ions, divided by the sum of the radius of ions, as follows:
$$\text{Lattice energy} \propto \dfrac{q_+ \...
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Tin (II) chloride is white while tin(II) iodide is red. Why?
Tin (II) chloride is white while tin(II) iodide is red. Why?
The answer given in my book says:
Bigger anion has higher polarizability; more polarization greater is the intensity of colour(...
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Chemical bond at Aluminum / Aluminum oxide interface
I am trying to find out what chemical bond holds aluminum oxide to the aluminum on which it forms. The only information I was able to find on the internet was in a Google book which suggested that the ...
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Are Fajans rules relevant to melting and boiling points of alkali metal hydrides?
Among LiH, NaH, KH, RbH, CsH the one with the highest melting point is LiH, and it keeps on decreasing till CsH. The reason for this in my textbook is that the size of cations keeps on increasing down ...
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Crown ether complex formation with cesium carbonate
I am searching for some papers which form complex between crown ether and caesium carbonate. But Most papers only use caesium carbonate as a base in the synthesis of crown ether, not ionic compound ...
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Why is the Conductivity trend same in fused and in dissolved or aqueous state of ionic compounds?
For an example if we take $\ce{KCl}$ and $\ce{NaCl}$ then I have understood the part where in aqueous state $\ce{Na+}$ becomes bigger than $\ce{K+}$ hence the conductivity reverses but in fused state ...
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What is the structure of sodium chloride in the liquid state?
I understand that sodium chloride when solid, is a lattice, so NaCl there is an empirical formula,(so, expresses that the ratio of Na to Cl is 1-1), and not a molecular formula expressing exact ...
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