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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Clarification on Oxidation Number and Ionic Charge

I am confused on the differentiation between ionic charge and oxidation number (state). For example and simplicity, $\ce{NaCl}$ is an ionic compound so it forms $\ce{Na+}$ and $\ce{Cl-}$. Are these (...
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Should moderately soluble compounds like calcium hydroxide be denoted (aq) or (s)?

I'm learning to write balanced molecular and ionic equations. For "moderately soluble" compounds such as calcium hydroxide, how do I know whether to write the state symbol as (aq) or (s)? This is the ...
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Intercalation and Ionic Bonds

What I know: Coming from a physics background and a frequenter of more glib stack exchange sites, I only recently found out that intercalation is a thing when studying Lithium-Ion Batteries. As I ...
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Ionic compound gases

Does any molecule containing only ionic bonds exist as a gas in room temperature? In the case of carbon dioxide, it is a covalent molecule which is a gas at rtp. Does the same apply for ionic ...
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How can FeS2 be the formula of iron sulphide and CaC2 be the formula of calcium carbide?

I know that the valency of iron can either be 2 or 3 and so the formulae of the possible sulphides of iron should be $\ce{FeS}$ and $\ce{Fe2S3}$. But I have recently seen the formula $\ce{FeS2}$ used ...
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Nomenclature of polyatomic ions

Is there a way to remember polyatomic ions (i.e $\ce{PO4^{3-}}$, $\ce{SO4^{2-}}$ etc.). For example, our professor will ask on an exam what the equation for iron (III) carbonate. Obviously the (III) ...
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Why is the formation of NaCl an exothermic process?

My book says, When NaCl forms, what really happens is that $\ce{Na+}$ and $\ce{Cl-}$ come together and form an ionic bond and thus NaCl is formed and it is a quite exothermic reaction. Why and ...
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How is NH4Cl a salt?

So what I know is, a salt is an ionic compound between a metal and a non-metal which exchange electrons. Like in $\ce{NaCl}$, $\ce{Na}$ is the metal and $\ce{Cl}$ is the non-metal, $\ce{Cl}$ hogs up ...
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Is Fe(OH)3 a salt or an alkali?

I know that a neutralization reaction (i.e. a reaction between an acid and a base) results in the formation of a salt and water, but when I came to know that $\ce{Fe(OH)3}$ is salt, I began to have ...
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How can one determine the charge of a polyatomic ion? [closed]

I'm stuck on determining the charge on various polyatomic ions according to the rule of charge balance. I keep getting 0 for each of these, but wonder if that's not the case. $\ce{KMnO4}$ $\ce{K2C2O4}...
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Why is benzenediazonium fluoroborate water insoluble and stable at room temperature?

Benzenediazonium fluoroborate is water insoluble and stable at room temperature. Why is this salt, water insoluble? Also I am told that benzenediazonium salts are stable only at low temperature(<5°...
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Calculating the chloride concentration

What are the concentrations of $\ce{Cl-}$ in the following solution? $1.9\ \mathrm{g}\ \ce{MgCl2}$ is dissolved in water to make $1\ \mathrm{L}$ total solution $$48.31\ \mathrm{g/mol}\ \ce{MgCl2}$$ $...
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Type of reaction between metal and salt

What type of reaction is the following? $\ce{ 10Na(l) + 2KNO3 (s) -> K2O(s) + 5Na2O(s) + N2 (g)}$ So far my best guess has been that it's a double replacement reactions with evolution of gas. Is ...
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Why does an anion not only bind to a single cation?

When $\ce{Na}$ binds with $\ce{Cl}$ to form $\ce{NaCl}$, why does the Na bind with multiple $\ce{Cl}$'s and not only one? A Na-ion is positively charged due to donating an electron and a $\ce{Cl^-}$...
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Relationship of Dielectric constant with ionic bond

How is dielectric constant related to formation of ionic bond?
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Is beryllium difluoride covalent or ionic?

My textbook says that despite the large electronegativity difference $\ce{BeF2}$ is covalent since the beryllium ion will have too much charge density and it will attract the fluorine electron cloud ...
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About ionic bonds (and ionic compounds) [closed]

I have a few questions: All ionic bond occurs between a metal and a non-metal. Is this true? In the definition of metal and/or non-metal are the metaloids included? In the definition of non-metal are ...
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Naming of hydroxides

In naming of compound, for example in strong base; KOH and $\ce{Ca(OH)2}$ have different formula, in potassium hydroxide, one hydroxyl group is attached while in calcium hydroxide two hydroxyl group ...
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How to distinguish between CsCl and NH4Cl by a chemical test?

$\ce{CsCl}$ and $\ce{NH4Cl}$ have similar reactions. For example, they can react with $\ce{AgNO3}$ to produce $\ce{AgCl}$ precipitate. So my question is: Can we use a chemical test to distinguish ...
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How to distinguish between Na2CO3 and NaHCO3 by a chemical test?

$\ce{Na2CO3}$ and $\ce{NaHCO3}$ have similar reactions. For example, they can react with acid to produce $\ce{CO2}$. So my question is: Can we use a chemical test to distinguish between $\ce{...
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Barium sulfide vs Ba2S2

I was predicting a very simple chemical equation $$\ce{Ba + S ->}$$ And I had solved it as $$\ce{Ba + S -> BaS}$$ The answer should make sense as barium has a charge of +2, and sulfide has a ...
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Melting point of ocean salt: eutectic?

I'm interested in the melting point of ocean salt. While sodium chloride has a melting point of 801 °C, ocean salt contains 15 % other ions, mainly sulphate, magnesium, calcium and potassium (the ...
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Melting points of alkali metal halides

The correct order of melting point of alkali metal halides is: $\ce{MF}>\ce{MCl}>\ce{MBr}>\ce{MI}$ $\ce{MI}>\ce{MBr}>\ce{MCl}>\ce{MF}$ $\ce{MCl}>\ce{MF}>\ce{MBr}>...
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Alkali and alkali earth metal carbonates and bicarbonates decomposition

Which of the following can not decompose on heating to give $\ce{CO_2}$? $\ce{Li_2CO_3}$ $\ce{Na_2CO_3}$ $\ce{KHCO_3}$ $\ce{BaCO_3}$ What I have read till now: Lithium carbonate ...
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Why is MnO2 not a peroxide?

As I know, $\ce{MnO2}$ is called manganese(IV) oxide. Why can't we name it manganese peroxide since manganese(II) exists too? In other words, how do we know that the oxidation number of manganese in ...
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How to make γ-MnO2 in a lab?

I am working on Li-ion batteries, and I need to use γ-$\ce{MnO2}$ (electrolytic manganese dioxide). I have googled and read quite a few papers, but I am not very sure of those methods. I'd love ...
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Chemical Formula for Barium Chloride

Barium Chloride is represented as $\ce{BaCl2}$. Since chlorine is a diatomic molecule, It should be denoted as $\ce{Cl2}$. Formulating, we get \begin{array}{|c:cc|}\hline \small \rm Element & ...
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Alkalide compounds

I have read much more about metallic hydrides but I am totally confused about "inverse alkali hydrides" or "hydrogen alkalides" while reading refer to this. What are these compounds and how do they ...
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Why exactly does molten NaCl explode, when it is poured into water?

Why does molten $\ce{NaCl}$ explode, when it is poured into water? $\ce{NaCl}$ has a high melting point, $1074\ \mathrm{K}$ ($801~\mathrm{^\circ C}$). $\ce{NaCl}$ has a molar mass of $58.44\ \mathrm{...
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What happens when potassium iodide is added to a copper (II) salt?

$$\ce{Cu^2+ + KI -> ??}$$ I thought of this reaction: $$\ce{Cu^2+ + 2KI -> CuI2 + 2K+}$$ But since $\ce{CuI2}$ doesn't exist, the $\ce{I-}$ ions must reduce $\ce{Cu^2+}$ to $\ce{CuI}$ and ...
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What is the structural formula of alkali hypohalite: MOX or MXO?

Recently I came across this question and in the comment section, there was an argument regarding the formula of sodium hypoiodite which kept me wandering: what is the actual formula of alkali ...
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How to measure saturated salinity and mineral levels for flaked sea salt?

I am a sea salt enthusiast looking to make the perfect flakey sea salt. I start with sea water and boil it down to a thick brine. Then with less heat I reduce the brine more slowly and inverted salt ...
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Is the reaction of silver nitrate and copper endothermic or exothermic?

Is the following reaction endothermic or exothermic and why? $$\ce{2 AgNO3 + Cu -> Cu(NO3)2 + 2 Ag}$$ EDIT: I have a feeling that it is exothermic due to the fact that it is spontaneous and will ...
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Why does Cu(OH)2, which is generally insoluble due to low Ksp become soluble in excess of a base, such as NaOH?

Where does the "excess" criteria come into the picture? Also, can the equilibrium $$\ce{Cu^2+ + 6 H2O <=> [Cu(H2O)6]^2+}$$ participate in the solubility process in any case? So there are 2 ...
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Why does KCl come in amber coloured bottles?

I remember from school that photosensitive chemicals are kept in amber coloured bottles. Is KCl photosensitive? I read up the impurities list on the bottle and it says that it may have bromides too? ...
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Why did my iron nails not dissolve in hydrochloric acid?

I was trying to dissolve iron metal in HCl to make iron chloride, but ran into some problems. I'll give a brief background of my experiment. I took iron nails and put them in a container filled with ...
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Does the activity product decrease with increasing ionic strength?

I have a question regarding what happens to the solubility of $\ce{CaSO_4}$ or the rate that $\ce{CaSO_4}$ will dissolve when we add $\ce{NaCl}$ to the solution: $\ce{CaSO_4}$ will dissolve into $\...
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What is the colour of chromium(III) chloride solution?

I had a question asking about the colour of the solution of chromium(III) chloride in my exam, all my colleagues have different answers, I couldn't find any exact answer after searching!
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Problems with creating sodium hydroxide from sodium (hydrogen) carbonate

If sodium hydrogen carbonate (baking soda, $\ce{NaHCO3}$) is heated to greater than $50~\mathrm{^\circ C}$, it will release carbon dioxide and water to form sodium carbonate: $$\ce{2NaHCO3 -> ...
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AlCl3: ionic and covalent?

My textbook states that AlCl3 is both an ionic and a covalent compound .How is it so?
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Why is MnSO4 colourless?

I get it that transition metal salts have colour due to d-d transition from $\mathrm{t_{2g}}$ to $\mathrm{e_g}$ orbitals in octahedral and the opposite in tetrahedral but why would $\ce{Mn^2+}$ not ...
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What will be the reaction between tin (II) chloride and copper (II) chloride?

I just tried conducting an experiment during lunch today. Now, I calculated this reaction 4 days ago dealing with electrochemistry, $$\ce{SnCl2 + CuCl2 -> Cu(s) + SnCl4}$$ Theoretically, I got ...
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How is Al2Cl6 covalent and Al2O3 ionic?

I encountered a question where the type of bonding for various oxides are prompted. Two of which are $\ce{Al2Cl6}$ and $\ce{Al2O3}$. I thought that chlorine atoms are more electronegative than oxygen ...
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Why do ionic compounds have such high melting points and boiling points? Do they have IMAFs? [duplicate]

Molecules have IMAFs that determine the melting and boiling points. What about with ionic substances? What keeps the different compounds together? Do they experience IMAFs? I've heard that it's the ...
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Does increasing electronegativity imply more covalent character?

If there is a larger electronegativity difference between two atoms, shouldn't the compound be more ionic? In an explanation of the diagonal relationship, it states that "on moving across the period, ...
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Why Does Coordination of Metal Ions Happen Anyways?

I've been studying coordination chemistry, but I still have a fundamental question about the area: why do transition metals even form coordination compounds, while main group metals do not? Why can't ...
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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 ...
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What is the most stable oxide of Fr?

I read that the heavier alkali metals, like K, Rb, and Cs all prefer to form superoxides. Since Fr is the heaviest alkali metal, I assumed it would follow the same trend as the previous alkali metals, ...
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Ionic Compounds and finding Anions

K2HPO4 is an ionic compound with an -2 Anion and a +1 Cation. The thing I'm finding hard to understand is why the four Oxygen atoms don't add to the Anion charge. E.g. H+1 P-3 O-2 O-2 O-2 O-2 = ...
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Is it possible to have an airborn fluorescent particle that reacts to lightning?

I want to measure the expansion of the atmosphere when it is heated and impacted by lightning, to have an idea of the propagation of sound waves made by lightning. To do this, the ideal would be to ...