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23 votes
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Could ammonium azanide exist?

Technically, ordinary liquid ammonia may be regarded as a very dilute solution of ammonium azanide through its autoionization. (Water is similarly very dilute hydronium hydroxide.) This technicality ...
Oscar Lanzi's user avatar
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11 votes

Could ammonium azanide exist?

In standard conditions ammonium amide in pure form wouldn't be stable as it would turn into ammonia through proton transfer. However, it is being taught that in liquid ammonia there is an equilibrium ...
Fractal's user avatar
  • 402
11 votes

Is tropylium cyclopentadienide possible?

While I can't give a definitive disproof, my intuition is that an unsubstituted cyclopentadienide anion would be far too nucleophilic and react with the tropylium cation at non-cryogenic temperatures (...
Nicolau Saker Neto's user avatar
8 votes

Does an ionic bond have a dipole?

"A dipole" strongly implies a single thing having two poles. A molecule, like for example HCl, is a single thing. It consists of two atoms sharing a privileged spatial relationship, that ...
Randy Lambreghts's user avatar
7 votes
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Why does KCl have FCC structure instead of BCC?

ChemLibreTexts describes the radius ratio rule as follows. (We) consider that the anion is the packing atom in the crystal and the smaller cation fills interstitial sites ("holes"). Cations ...
ananta's user avatar
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6 votes

Does an ionic bond have a dipole?

Context is important for any coherent answer The question is more subtle than it looks because the context matters for the answer. Does an ionic bond have dipole? Yes, by definition: some separation ...
matt_black's user avatar
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5 votes
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Cannot identify C[Mg+]

One explanation for C[Mg+] is the one of of methylmagnesium as in the Grignard reagent of methylmagnesium chloride (C[Mg+].[Cl-])...
Buttonwood's user avatar
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5 votes
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Why is Fe3O4 a non-stoichiometric compound?

Stoichiometric compounds have composition with fixed and exact atomic ratio in small integer numbers. Nonstoichiometric compounds have their real composition expressed by atomic ratios in rational ...
Poutnik's user avatar
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5 votes
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Does chromium chromate -- Cr₂(CrO₄)₃ -- exist?

You're assumption is correct, chromic chromate, $\ce{Cr2(CrO4)3}$ does exist. Some other names listed at NIH.gov are chromium(III) chromate and dichromium tris(chromate), and the diagram below is from ...
DrMoishe Pippik's user avatar
4 votes
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How to Derive the Born-Mayer Equation?

There's no need to Taylor expand; the exponential cancels exactly. Starting with the following (lattice-constant dependent) expression for the total ionic energy: \begin{equation} E_P(r) = -\frac{...
S. Macfoy's user avatar
4 votes

Finding the atomic packing factor (APF) of Sodium Chloride and other FCC ionic compounds

Coming to question 1, that is, is your calculation correct? Quoting from Wikipedia, In solid sodium chloride, each ion is surrounded by six ions of the opposite charge as expected on electrostatic ...
Harikrishnan M's user avatar
4 votes
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What would superionic water ice look like?

As suggested in the comments, "what does superionic ice look like" in terms of its "natural" (reflected/transmitted) color is difficult to access because the phase seems to exist ...
Oscar Lanzi's user avatar
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3 votes

What factors cause a few sodium salts to be water-insoluble?

Having fluorine as the element ionically bonded to sodium is one factor that inhibits solubility. Like all other pretransition metal ions (which are hard acids), bonding to fluorine bases is typically ...
Oscar Lanzi's user avatar
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3 votes
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Is mercury(I) chloride ionic or covalent?

A ionic crystal is one with structure dominated by ionic interactions. The charge separation in $\ce{Hg_2Cl_2}$ is small, with Mullicken charges about 0.2e at most [1]. By comparison, alkali halides ...
permeakra's user avatar
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3 votes

What is the most stable oxide of francium?

With a half-life of just 22 minutes for the longest-lived isotope francium-223, Wikipedia says that due to intense heat of radioactivity it vaporizes itself. This is because as more and more atoms of ...
Proscionexium's user avatar
2 votes

Why is Fe3O4 a non-stoichiometric compound?

The exact formulation of $\ce{Fe3O4}$ is indeed stoichiometric and requires a fixed amount of $\ce{Fe}$ and $\ce{O}$ to react as stated in the question statement. However, usually, this won't be the ...
ananta's user avatar
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2 votes
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why chemical bond between Na and Cl happens

Here is an easier explanation not relying on "stability" or quantum mechanics. You start out with some sodium ions and some chloride ions in aqueous solution. Each sodium ion is surrounded ...
Karsten's user avatar
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2 votes
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Why do samples of ionic compounds break into pieces, but the pieces do not combine into larger samples again?

Your intuition is not wrong... but the atoms near the surface have to be free to move or exactly aligned, and must not covered by an adhered layer of air. For example, by dissolving a salt in water ...
DrMoishe Pippik's user avatar
2 votes

Does an ionic bond have a dipole?

As a supplementary answer, the common definition of a dipole is a separation of charges, this separation means different the presence of opposite charge particules or quasiparticles. To be clear a ...
M06-2x's user avatar
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2 votes
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How would the regions of this graph showing percentage of ionic character, be classified?

The relation of the calculated ionic character and the Pauling electronegativity difference is the function of the ionic character model. There are no regions A-F in this context. There is just the ...
Poutnik's user avatar
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2 votes
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Cesium Chloride Density Gradient Centrifugation and Isotopes

The ratio of masses of 135Cs to 137Cs is smaller, by a factor of 5, than the ratio of masses of 14N to 15N. While what you suggest is theoretically possible, the thermal motion of water, which must ...
DrMoishe Pippik's user avatar
2 votes

Reduction of di-N-substituted imidazole to imidazoline to remove counterion?

As Ref.1 pointed out, aromatic nitrogen heterocycles in which the nitrogen contributes only one electron to the $\pi$-system are electrophilic as compared to benzene, and show a reduction by lithium ...
Mathew Mahindaratne's user avatar
1 vote

I have fabricated a starch film impregnated with calcium carbonate, and the film is showing hydrophobic behaviour after addition of calcium carbonate

$\ce{CaCO3}$ itself is hydrophylic, though it might be less so than starch. However, surface texture may make a substance hydrophobic. Simply forming a surface into nano-pillars can make it water-...
DrMoishe Pippik's user avatar
1 vote

How to determine the dynamic of progression of two simultaneous precipitation (double replacement) reactions?

Consider that solubility of $\ce{AgCl}$ is 1.9 mg/L and of $\ce{Ag2CrO4}$ is 22 mg/L, both at 25 °C. When just a little $\ce{AgNO3}$ has been added, the $\ce{Ag2CrO4}$ is not concentrated enough to ...
DrMoishe Pippik's user avatar
1 vote

Why is the statement regarding the strength of ionic bonds reasonable?

If a bond is ionic, the strength depends on the charge of the bonding partners and the distance of the ions. Strength here refers to the energy required to increase the distance between the two ions ...
Karsten's user avatar
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1 vote
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Solubility of SrF2 in aqueous solution of NaF

In the expresion $\ce{S(2S + 0.1)^2}$ the first $\ce{S}$ is for the concentration of $\ce{Sr^{2+}}$ which is dissolved. There are two ions of $\ce{F^-}$ for each atom of $\ce{Sr^{2+}}$. So $\ce{2S}$ ...
MaxW's user avatar
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1 vote
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Calculating salinity from sodium and chloride in water

You can't really balance cations and anions with the information given to get precise compound concentrations. However some "back of the envelope" calculations can be done. To compare the ...
MaxW's user avatar
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1 vote
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Magnesium chloride to citrate conversion (reaction/synthesis)

Eventual direct mixing of $\ce{MgCl2}$ and $\ce{H3Citr}$ to get $\ce{MgH-Citr}$ and $\ce{HCl}$ and eventual precipitation of the citrate would hit the stumble stone of acidification of solution, ...
Poutnik's user avatar
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