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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Rock salt structure: chloride lattice or sodium lattice?

Source From this diagram of the rock salt structure ($\ce{NaCl}$) we see that both the chloride and sodium ions have the same environment. That is to say, they each have the same number of neighbours ...
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How to know which ionic compound have the highest lattice energy without knowing the values of the radii?

Given two ionic compounds, for instance: $$\ce{CaS} \quad \mathrm{or} \quad \ce{KCl}$$ What is the procedure to predict which of the two have the highest lattice energy (in absolute value)? (...
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180 views

Manganates (II)

I want to ask about character of manganese(II) compounds. I read that $\ce{MnO}$ is basic, just like $\ce{Mn(OH)2}$. I started doing research and I read ions like $\ce{MnO2^{2-}}$ and $\ce{HMnO2^-}$ ...
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If I drink water without sipping, is there a chance of saliva diffusing into my bottle?

I always prefer to drink water without sipping, like this: I do this so that my saliva doesn't contaminate the water contents, which would make the water impossible to share with my friends. But ...
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Why is the empirical formula of sodium chloride NaCl? [duplicate]

Since we know in sodium chloride crystal sodium ions are surrounded by $6$ chloride ions and each chloride ions are again bonded to $6$ sodium ions. What I want to know is that on what basis empirical ...
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417 views

Why does the conductivity of a LiOH solution decrease when boric acid is added?

If I start with pure water and add $\ce{LiOH}$ the conductivity of solution increases. However, if I then dissolve boric acid in the same solution the conductivity falls. I would have thought adding ...
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What is melting? Which bonds do we break to melt something?

To melt diamond, we have to break the covalent bonds, which we can consider 'intermolecular' because it is one giant molecule. To melt Methane, we have to break the van der Waals (intermolecular) ...
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Why is there an increasing solubility in water for chlorides, chlorates, perchlorates in that order?

According to Wikipedia $\pu{100 mL}$ of water dissolve at $\pu{25 ^\circ{}C}$ about $\pu{35 g}$ of $\ce{NaCl}$ (1), but about $\pu{79 g}$ of $\ce{NaClO3}$ (2), and around $\pu{210 g}$ for $\ce{NaClO4}$...
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An ionic compound dissociates into 3 ions of 3 different elements?

When an ionic compound dissolves in water and becomes ions. 1) Typically we see: $\ce{AB ->}$ Ions $\ce{A+ + B-}$ $\ce{ABC ->}$ Ions $\ce{AB+ + C-}$ 2) But how about the one below, is there ...
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Where can I find a downloadable database of basic physical and chemical properties?

The web has many online databases of properties of compounds locked behind search interfaces, but I can't find anything you can actually download. I want a corpus of data that might allow me to, say, ...
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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 ...
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Anion-exchanged compound - smaller 1H NMR integrations

I anion exchanged one of my compounds (Br- to PF6-) and the NMR integrations changed as shown on the two NMRs below. The aliphatic region peaks integrate to smaller values in the second one. Are there ...
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Dissociation of zinc hydride

How can we determine if zinc hydride is a ionic compound? If it is a ionic compound then why doesn't it dissociate when put in water?
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Why is CaCl2 called calcium chloride?

Doing a first year chem class. Just read through the molecular naming of compounds and now I'm confused as to why $\ce{CaCl2}$ is called calcium chloride and not calcium dichloride?
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Crystallisation and crystal surface

It is my understanding that if you put table salt (as an example of polar compound) in water, the Na+ and Cl- ions will freely move through the solution. They will make the solution conductive and ...
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Reaction between zinc and sulfur

Would the reaction between zinc and sulfur be $$\ce{Zn_{(s)} + S_{(s)} -> ZnS_{(s)}}$$ or $$\ce{8 Zn_{(s)} + S_8\ _{(s)} -> 8ZnS_{(s)}}$$ I know that $\ce{S}$ and $\ce{S8}$ are allotropes of ...
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Chemical Equation: Sulfuric acid and powdered sodium carbonate

I was asked to write a balanced chemical equation for the reaction between sulfuric acid and sodium carbonate. The balanced equation isn't the problem. The question asks to also show all the state ...
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174 views

How to solve this contradiction?

I am getting confused about this the more problems I do on it. My understanding was that only strong acids and strong bases will react to produce water and a salt. Something like this: Molecular Eq: $\...
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How do hydrogen bonds break the ionic bonds of a crystal lattice? [duplicate]

In the case of water dissolving sodium chloride. I was under the impression that hydrogen bonds were much weaker than the ionic bonds in sodium chloride, so how do they overcome the ionic bond ...
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Magnesium bicarbonate dissociation products

What is the equation for $\ce{Mg(HCO3)2}$ dissociation? Are there more steps because it's a complex substance? Could the possible products be $\ce{MgHCO3+ + HCO3-}$?
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No reaction in net ionic equation for lithium nitrate and sodium chloride?

I've heard that nothing in the following net ionic equation reacts: $$ \ce{Li+ + NO3- + Na+ + Cl- -> \text{"nothing"}} $$ Is this true? Could someone explain why there would be no reaction?
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Why does Fluorine have a high affinity for Calcium?

I keep hearing from several websites and videos that Fluorine seems to like bonding to Calcium specifically; can someone please tell me why? I can't seem to find a clear response on the internet. ...
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Why do Ca-Ca distances get shorter in ionic structures, as compared to the metal?

I saw in the book Chemistry of the Elements by Greenwood & Earnshaw, 2nd ed., p 66, that the distance between calcium atoms decrease when it's forming an ionic structure. The closest $\ce{M-M}$ ...
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polar covalent bond

Please take a look at the image of polar covalent bond in the $\ce{H2O}$ molecule below. My question is given in bold type in the following discussion. Here is my flow of thought that confused me so ...
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Finding out the composition of seawater/brine?

As part of a project, I am working on precipitating salts from seawater and brine. I have a sample of seawater and I need to measure the concentrations of $\ce{Mg^2+, Ca^2+ and Li+}$ present in the ...
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Is lithium hydride a salt?

Hydrogen is generally considered a non-metal, and a non-metal and a metal often makes a salt. However, lithium hydride seems like a special case. The wikipedia article does not clearly state if the ...
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Why do displacement reactions occur?

Suppose we have a compound, say copper sulfate. I know that sulfate is a poly-atomic ion, having valency 2. And, in this case, copper also has valency 2. So, to fullfill their 'octet' requirements, ...
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Why don't salt crystals attract each other?

If salt is made of ions in a giant lattice, surely if I have two crystals they would attract each other and fuse? Or maybe the ions can't get close enough to each other to attract, or the surface is ...
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Does mercury chloride (ii) evaporate at room temperature? [closed]

if you leave mercury chloride (ii) exposed to air in a room does it evaporate to any significant level which can cause toxicity?
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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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making patinas for copper

Copper nitrate, calcium carbonate and ammonium chloride mixed will patina copper green. I need to know If calcium carbonate should be a heavy powder or a reagent. If calcium chloride is a dehydrate ...
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Substituting Ulexite

I'm working on ceramic glaze chemistry. One ingredient I don't have, but want to substitute is ulexite: $$\ce{NaCaB5O6(OH)6.5H2O}$$ I have borax, calcium borate, and calcium silicate: $$\ce{NaB4O7 ...
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Charge density is the amount of charge per unit volume but what is charge?

I was studying about x ray crystallography and my book says that charge density is measured in electrons per nano-meter cubed and this means that charge is the amount of electrons. But i am not sure ...
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How can I prepare Sn(NO3)2?

What is the method to be followed to prepare $\ce{Sn(NO3)2}$? I tried to prepare $\ce{Sn(NO3)2}$ from reaction below: $$\ce{SnCl2 + 2HNO3-> Sn(NO3)2 + 2HCl}$$ But $\ce{SnCl2}$ is not soluble. We ...
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Solubility of gold salt solution?

I was wondering what salts of gold are soluble and which are insoluble. From what I understand, silver is soluble as silver nitrate but insoluble as most other common salts like chlorides and ...
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Is the bond in HF ionic while it is covalent in HCl?

Why would a hydrogen atom "donate" to fluorine in an ionic bond but not in $\ce{HCl}$? Why would $\ce{H}$ and chlorine share instead of $\ce{Cl}$ just stripping it away like $\ce{F}$ does?
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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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Does bonding happen naturally? [closed]

For example, how do the bonds in NaCl form? I understand that the elements need to obtain an octet structure to become more stable, by either accepting or losing electrons. In NaCl, from my ...
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Why is sodium cyanide an inorganic compound?

I have been told that sodium cyanide is an inorganic compound during a lab experiment but I don't know the reason for this. Shouldn't sodium cyanide be an organic compound because it has a carbon ...
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Whose solubility increases with increase in temperature?

Solubility of which among the following substances in water increases slightly with rise in temperature? (a)$\ce{KBr}$ (b)$\ce{KCl}$ (c)$\ce{KNO3}$ (d)$\ce{NaNO3}$ Answer is (b). I don't know why. ...
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Why is potassium phosphate KH2PO4 in this reaction?

This is a continuation of this question because the first thing that came in my mind is that why potassium phosphate in this reaction is $\ce{KH2PO4}$ and not $\ce{K3PO4}$? In the wikipedia article ...
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Why is Sodium Chloride White? [closed]

Why is solid sodium chloride white - and for that matter, why are the majority of salts white in solid form?
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How to write equations for dissociation of ionic compounds in water?

Please write a dissociation-in-water equation for the compounds $\ce{BeI2}$ and $\ce{LiI}$. Make sure to add the states of matter after each compound. Currently, for $\ce{BeI2}$ I have the equation $$...
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Salts that are more hydrophilic than NaCl

What other, rather easy to obtain, salts are more hydrophilic than $\ce{NaCl}$? Is there a hydrophilic scale for substances like the Mohs scale of mineral hardness?
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Sweet non-toxic salts

I have recently read one post over here in chemistry exchange about tastes of ionic salts, some described lead and beryllium ones to be sweet but toxic, some my point is there any salt that is ...
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What is the difference between a Chemical Formula and Formula Unit?

In my textbook, a chemical formula is described as : "A formula that shows the kinds and numbers of atoms in the smallest representative unit of a substance" While a formula unit is described as : ...
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Why exception is noted in the solubility of lead salts?

There are many exception in the solubility of lead salts like: Lead sulfate is insoluble in cold water whereas most of the sulfates are soluble in cold water. Lead chloride is also insoluble in cold ...
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Proof of Concentration dependence of molar conductivity

If we go by the simple electron model, Conductivity/Concentration=carrier charge*mobility and mobility is only dependent on temperature for electrons. My question is regarding strong electrolyte, I ...
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510 views

Would sodium carbonate from carbon dioxide plus hydroxide be formed in solution or as a solid?

If normal breathable atmosphere were to be reacted with aqueous sodium hydroxide, what form would the resulting sodium carbonate take, would it be dissolved in the solution or solid? Note: I'm ...
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Do the compounds in a chemical equation need a net charge of zero when predicting reaction products?

For predicting reaction products in chemical equations, I am not sure of what the subscripts would look like in the product side. I know the types of reactions, but when you predict the products, do ...

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