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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How to name LiN(CF2SO3)2?

I found this compound in the list of inorganic lithium salts from this article on ScienceDirect. It is said to be of the sulfonate group. Let's focus on the anion alone. I'm not sure if it can be bis(...
-1 votes
1 answer
390 views

Balancing a chemical reaction with oxidation numbers

We have been teached how to balance chemical reactions with oxidation numbers in school, but somehow I can't understand it. This is the equation to balance $$\ce{Cu(s) + NO3−(aq) + H+(aq) -> Cu^2+(...
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Solubility of CsCl

I was just learning in analytical chemistry about classical cation separation and in the $\ce{HCl}$ group I was wondering why $\ce{CsCl}$ is apparently easily soluble in water when $\ce{AgCl}$ ...
2 votes
1 answer
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Making an UV inactive salt UV active during purification of charged anion with HILIC purification?

In the context of a purification setup I am asking myself the question: Can a UV inactive charged substance made be UV active by a counter ion that absorbs UV light during a column run? If so, when no ...
9 votes
1 answer
442 views

What would superionic water ice look like?

Phys.org's Giant lasers crystallize water with shockwaves, revealing the atomic structure of superionic ice links to Nature Physics: Experimental evidence for superionic water ice using shock ...
4 votes
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279 views

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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1 answer
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How to determine the dynamic of progression of two simultaneous precipitation (double replacement) reactions? [duplicate]

We have a solution of mineral water with potassium chromate added to it, and want to titrate the chloride ions in the mineral water. We were told to use silver nitrate for this, which would produce ...
-3 votes
1 answer
61 views

How would the regions of this graph showing percentage of ionic character, be classified? [closed]

Looking here at this website - Omnicalculator, at the section of the website for calculating percentage of ionic character. Omnicalculator - Percentage Ionic Character They let you choose elements and ...
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1 answer
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Calculating the Hopping distance in K+ F- bonds

This is a graph showing the formation of K+ F- ionic bonds. To my understanding, when the atoms are far apart, their neutral state is more stable. But when they get closer, they form ionic bonds to ...
1 vote
1 answer
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Cesium Chloride Density Gradient Centrifugation and Isotopes

In Cesium Chloride Density Gradient Centrifugation, as used by Meselson and Stahl, Cesium ions can be seen as strongly affected by centrifugation, so much so that they can overcome their ionic bonds ...
-1 votes
1 answer
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How do you perform an ion exchange of a monovalent cation with Br- counterion to a divalent or trivalent anion?

I tried to react an organic compound I have synthesized containing a di-N substituted imidazole bromide salt with Ag3PO4 with water at room temp to try to replace the Bromide with PO4(3-). I dont ...
1 vote
1 answer
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Compare the covalent character of ZnCl2, CdCl2,HgCl2

I want to know how to arrange the covalent character of ZnCl2, CdCl2, and HgCl2. By Fajans' rules, We know that a smaller cation equals higher covalent character. We also know that atomic size ...
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1 answer
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Ionic compounds with hydride anion [closed]

Ionic compounds are formed when an atom $\ce{A}$ donates one of it's electron to another atom $\ce{B}$ to form an ionic compound $\ce{A+B-}$. This is significantly more likely to happen as the ...
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Ionic bond formation [duplicate]

When two separate pieces of sodium chloride crystals are physically put together, no wonder that they will not fuse with each other. But I don’t understand why. Ionic bonds are described to be non-...
1 vote
1 answer
872 views

Obtaining ammonium perchlorate via double displacement reaction

I was tasked with figuring out how to make some $\ce{NH4ClO4}$(ammonium perchlorate). I found that one way of making it was to react potassium perchlorate and ammonium chloride in a double ...
-2 votes
1 answer
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Is polarizing power related to solubility, melting point of a compound? [closed]

It is stated in this websites that "It is found that the greater the possibility of polarization, the lower is the melting point and heat of sublimation and the greater is the solubility in non-...
3 votes
1 answer
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Reduction of di-N-substituted imidazole to imidazoline to remove counterion?

I would like to synthesize a di-N-substituted imidazole (compound 4) in its free base form or reduce it to generate an imidazoline (compound 5) to remove the bromide counterion to the imidazole ring. ...
-2 votes
1 answer
66 views

Why is the statement regarding the strength of ionic bonds reasonable? [closed]

In largely ionic compounds (e.g. NaBr and NaI), it seems to be generally true that, the greater the differences of electronegativity between the forming substances (i.e. The compound has more "...
-1 votes
1 answer
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Is mercury(I) chloride ionic or covalent?

Is mercury(I) chloride ionic or covalent? If I look here, I see arguments either way. The article doesn't mention anything about a cation or an anion. Some might think there's two mercury ions each 1+ ...
3 votes
1 answer
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What is the most stable oxide of francium?

I read that the heavier alkali metals, like potassium, rubidium, and cesium all prefer to form superoxides. Since francium is the heaviest alkali metal so far, I assumed it would follow the same trend ...
-1 votes
1 answer
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Why do samples of ionic compounds break into pieces, but the pieces do not combine into larger samples again?

A distinct property of ionic compounds is that they are brittle. We are taught this is due to the fact that when force is applied to the lattice, ions are shifted, resulting in positive ions repelling ...
8 votes
1 answer
723 views

Is tropylium cyclopentadienide possible?

Has this ever been tried? The respective aromatic ions are readily accessible, e. g., in the form of sodium cyclopentadienide and tropylium bromide. It shouldn't be hard to just combine these two ...
4 votes
1 answer
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What factors cause a few sodium salts to be water-insoluble?

We know that almost all salts with sodium as cation are water-soluble. But there are a few examples where the salt is water-insoluble; such as sodium bismuthate, sodium fluorosilicate, and much more. ...
1 vote
1 answer
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Solubility of SrF2 in aqueous solution of NaF

This might be really simple question but I have no idea how to proceed to solve such kind of question. The solubility product of $\ce{SrF2}$ in water is $\pu{8E-10}$. Calculate its solubility in 0.1M ...
-2 votes
1 answer
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Calculating salinity from sodium and chloride in water [closed]

let me start by saying that I am definitely no chemist, so this question might (or might not) seem trivial to all you professionals out there. I have recently found a brand of carbonated water here in ...
4 votes
6 answers
1k views

Does an ionic bond have a dipole?

Is an ionic compound like NaCl considered a dipole? It has a positive side (Na+) and a negative side (Cl-). Or is it true that an ionic bond does not have a dipole because a dipole is, by definition, ...
2 votes
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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 ...
0 votes
1 answer
281 views

Magnesium chloride to citrate conversion (reaction/synthesis)

How would one prepare magnesium citrate from magnesium chloride and citric acid? Will it work if I just heat a mixture of magnesium chloride and citric acid in water? I'd expect HCl to vaporize off. ...
2 votes
4 answers
3k views

Equation for salt formation for ammonium oxalate?

I'm having trouble finding out the salt formation equation for $\ce{(NH4)2C2O4}$ I thought it was $\ce{NH3 + H2C2O4}$ but that doesn't seem to balance out. $\ce{HC2O4-}$ seems to work, but are ions ...
6 votes
5 answers
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Epsom salts - heavy metal contamination myth?

This recipe for home-made handwash (liquid soap) consists of bar soap, water, Epsom salts, and coconut oil. The author specifically warns against using 'artificial' Epsom salts, preferring the ...
12 votes
5 answers
28k views

MgCl2 acidic or neutral in water?

I'm currently taking chemistry 12. On our test we were asked, when given a $0.1~\mathrm{M}$ solution of certain compounds whether the resulting solution when added to water would be acidic, basic, or ...
4 votes
1 answer
542 views

Why does KCl have FCC structure instead of BCC?

I have this table here. \begin{array} {|r|r|}\hline \text{Radius Ratio} & \text{Coordination number} & \text{Type of Void} \\ \hline <0.155 & 2 & \text{Linear} \\ \hline 0.155-0....
2 votes
1 answer
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Cannot identify C[Mg+]

I am not able to identify the molecule C[Mg+]. I came across it a number of times in the USPTO-50k dataset, in reactions such as the one shown below: ...
3 votes
1 answer
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On the exact definitions of Frenkel and Schottky defects

The wiki page on vacancy defects says; It is also known as a Schottky defect, although in ionic crystals the concepts are not identical. As far as I'm aware, they're the same. Furthermore, the wiki ...
4 votes
2 answers
3k views

Solvent for copper(I) iodide, copper(I) thiocyanate, silver iodide for HTM deposition; safety for methylammonium lead iodide

I'm a student working in a high school laboratory that is looking to pursue research into perovskite cells for next year, but I have some solubility and safety questions. What would be a good solvent ...
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1 answer
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why chemical bond between Na and Cl happens [closed]

We know that if Cl and Na get too close, they produce ionic bonding. Cl has 17 proton and 17 electrons and is considered stable. Na has 11 protons and 11 electrons and is considered stable. I ...
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2 answers
230 views

Why is Fe3O4 a non-stoichiometric compound? [closed]

Fe combines with O in a whole number ratio 3:2. Even the ions Fe2+ and Fe3+ are in the ratio 1:2. Then, why Fe3O4 is a non-stoichiometric compound?
8 votes
2 answers
11k views

Why does adding salt to water reduce the pH? [closed]

I recently heard someone claim that adding table salt to vinegar caused HCl to form which helped them clean coins - clearly not the case - however I thought I'd disprove it by doing an experiment. So ...
5 votes
2 answers
11k views

Comparing ionic character of group 1 elements

According to Fajan's rule ionic character should increase down the group as the size of cation increase. So it must be $$\ce{LiH < NaH < KH < RbH < CsH}$$ However, the following two ...
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1 answer
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Can ionic and/or metallic bonding produce stable long chains? Like polymers, though not necessarily as useful [closed]

Question Polymers are long chains ⛓️ of covalent bonds. Can similar structures exist for ionic and/or metallic bonding? They don't have to be as useful. I know there can be polymers with ionic bonds ...
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Why does iodine trichloride dimerize?

In which of the dimerization process, the achievement of the octet is not the driving force $\ce{2AlCl3 \to Al2Cl6}$ $\ce{BeCl2 \to BeCl2}$ (solid) $\ce{2ICl3 \to I2Cl6} $ $\ce{2NO2 \to N2O4}$ ...
11 votes
3 answers
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Is potassium bifluoride an ionic or a covalent compound?

The statement below is an excerpt from my textbook (Chemistry Part II, Textbook for Class XII by NCERT, ed. January 2014): Because of the tendency of fluorine to form hydrogen bond, metal fluorides ...
3 votes
1 answer
242 views

Can I convert copper(II) acetate or carbonate to copper(II) sulfate?

I am a high school student who does chemistry as a hobby, and as such I really don't know very much. I managed to make some copper(II) acetate and copper(II) carbonate, and now I'd like to convert it ...
1 vote
0 answers
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Hannay smith equation derivation

Our chemistry teacher taught us about Hannay smith equation for calculating the percent ionic character. He did not told how that equation was derived. I could not find any satisfactory result from ...
1 vote
2 answers
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Intermolecular Forces for Ionic Compound?

So in class we have learned London dispersion, dipole-dipole, ion-dipole and hydrogen bonding for intermolecular forces. Our teacher always uses covalent molecules as examples. So I was wondering ...
5 votes
3 answers
11k views

Why are magnesium chloride and calcium chloride more soluble than sodium chloride?

I read that $\ce{MgCl2}$ and $\ce{CaCl2}$ are more soluble than $\ce{NaCl}$ in water. Solubility of $\ce{MgCl2}$ is $\pu{543 g/L}$ and that of $\ce{NaCl}$ is $\pu{360 g/L}$ (both at $20^{\circ} \pu{C}$...
4 votes
2 answers
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Why triiodide ion does not form ionic bond with cation having +2 charge?

In general, I found that triiodide ion generally forms ionic bond with cations having +1 charge like $\ce{NH4+I3-}$, $\ce{K+I3-}$, $\ce{Tl+I3-}$. But, I have never seen triiodide ion forming ionic ...
2 votes
1 answer
118 views

Why metal hydrides have low lattice enthalpy

Lattice enthalpy is inversely proportional to the distance between the ions. And the trend of lattice enthalpies is: $\ce{MF>MCl>MBr>MI}$. But why do metal hydrides have lesser lattice ...
3 votes
0 answers
2k views

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_+ \...
1 vote
0 answers
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How to change the counterion of a nucleotide salt?

I need to take the sodium nucleotide salts I have available in my lab and modify them to instead contain some more exotic counterions. Can I do this by binding my nucleotides to a strong anion ...

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