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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3k views

If I mix carbon dioxide and sodium hydroxide in the right amounts in water, do I get baking soda?

Suppose I need a sodium bicarbonate solution (for non-food related reasons). Can I get something resembling it by mixing $\ce{NaOH}$ and $\ce{CO2}$ in water? Of course one should not attempt to make ...
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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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1answer
623 views

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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157 views

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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Why doesn't LiHCO3 exist in solid state?

I have read that $\ce{LiHCO3}$ does not exist in solid state. Is it because of the size of anion-cation concept or is it something else? So why is it only for lithium and not for sodium too?
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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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2answers
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Difference between lattice energy and thermal stability

For an ionic compound, is it always true that the greater the thermal stability, the greater the lattice energy. E.g. for 2 ionic compounds MX and MY, if MX has a higher thermal stability than MY, ...
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1answer
118 views

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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1answer
549 views

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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1answer
10k views

What is the yellow precipitate formed from reacting diamminsilver fluoride and potassium iodide?

These two compounds, silver diamine fluoride and potassium iodide (actually a solution called Lugol’s solution), are being used together in dentistry. When combined they form a yellow precipitate. I ...
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945 views

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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146 views

Unknown salt formed from electrolysis of urine

I am not sure what I was expecting to happen with this but I created a circuit to electrolyze various household liquids. My electrodes are copper — or at least claim to be, I think they might just be ...
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655 views

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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1answer
109 views

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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1answer
2k views

Stability by using charge/radius rule

I found a question Which is more stable among the following? (a) $\ce{CaCO3}$ (b) $\ce{MgCO3}$ Answer : (a) Explanation was given as: "$\ce{Mg^2+}$ has smaller radius than $\ce{Ca^2+}$ and thus $...
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1answer
967 views

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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1answer
2k views

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). ...
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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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Percentage of yield reaction question

By bubbling $\ce{Cl2}$ in a solution containing $176.6~\mathrm{g}$ of $\ce{MgBr2}$ are obtained [sic!] $135~\mathrm{g}$ of $\ce{Br2}$. However, the yield of this reaction is not $100~\%$. How many ...
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2answers
577 views

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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1answer
4k views

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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1answer
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Why do non-polar covalent compounds dissolve in non-polar covalent compounds only?

My textbook says that electrovalent and polar covalent compounds dissolve in electrovalent compounds and polar covalent compounds but not in non-polar covalent compounds. I understand the reason for ...
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Can solutions of polar covalent compounds conduct electricity?

I learned in class that solutions of polar covalent compounds are weakly conductive, while ionic solutions are strongly conductive. But I'm getting different answers online. According to this lecture,...
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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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1answer
453 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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331 views

Why do increasing concentrations of zinc chloride not linearly decrease the freezing point?

I did an experiment on how different concentrations of $\ce{ZnCl2}$ affect the freezing point of demi water. My results were that till a concentration of about $10\ \mathrm{mol\,dm^{-3}}$ the freezing ...
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2answers
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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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Is iron(III) carbonate stable in water?

I searched for this onsite already, and also found the following answer on Quora: In aqueous environment, iron(III) is bound by water molecules and exists as $\ce{[Fe(H2O)6]^3+}$. Due to strong ...
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1answer
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Help balancing reaction between Iron (II) chloride and potassium phosphate

Very rusty with chemistry and looking to review some basics. Came across the following: Iron(II) chloride and potassium phosphate react. Write and balance the molecular, ionic, and net ionic ...
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1answer
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Why doesn't a fractured salt crystal stick back together? [duplicate]

If you crack a large crystal of a salt like NaCl, why don't the pieces spontaneously bond back together on contact? The bonding is an exothermic process and the charged ions are presumably stuck ...
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Naming of ester alkoxide

I'm trying to name the following compound: I believe the carboxyl group has priority and should make up the parent name. I'm not sure how to name the alcohol derivative portion. My first thought is: ...
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2answers
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Does the salinity in seawater affect the process of alkaline hydrolysis?

I am an architecture student doing a project on crematorium spaces. I am looking at resomation or alkaline hydrolysis as an alternative method of disposition of a body. From what I gather from ...
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What is the name of the chemical compound: Cr(CO3)3?

Cr(CO${_3}$)${}_3$ This is an ionic compound. Chromium is a transition metal cation and CO${_3}$ is an anion with a charge of 2-, as said in my chemistry textbook. And since CO${_3}$ has a charge ...
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132 views

Would distilling a sodium fluoride solution generate hydrogen fluoride to any noticeable extent?

If you have a solution of NaF, and you boil it (to get pure water by distillation) can the fluoride ions in water separate from sodium ions and combine with hydrogen ions to form HF? ...
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270 views

Electrolysis of Anhydrous Sodium Hypochlorite

Considering liquid anhydrous sodium hypochlorite: $$\ce{NaClO (l)}$$ Assuming the ions are free, What would be produced if this were electrolysed? As I've found lots of information for it's ...
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How to balance chemical equations with polyatomic ions [closed]

I know that you can not split poly-atomic ions but I am confused on how to balance the following equation: 9PbSO4 -> 10PBSO3 + 3O2 Pb = 9 Pb = 10 S = 9 S = 10 O = 36 O = 36 Obviously the ...
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2answers
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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 ...
6
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3answers
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In my homemade electrolysis setup, only the negative end bubbles?

I've created an electrolysis setup by connecting a $6~\mathrm{V}$ battery to a cup filled with saline water via pencils; I am confused as to why only the negative pencil bubbles though. After running ...
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101 views

What kind of unit is this [A*m^2/mol]?

I found a term on this website that gives a unit of [A*m^2/mol]. The equation is: $k_d^{eff}=\frac{2RT\kappa^{eff}}{F}(t^+-1)\left(1+\frac{\text{d}\ln(f)}{\text{d}\ln(c)}\right)$ where R is the gas ...
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1answer
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Air ionization, positive ions

Sharp air cleaners has a technology called PlasmaCluster. They say that it produces negative ions $\ce{O-}$ and positive ions $\ce{H+}$ (the difference with classical ionization is that ionization ...
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2answers
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How to balance the equation for the reaction of aluminum bicarbonate and hydrochloric acid?

Here's what I have to balance: Solid aluminum bicarbonate and hydrochloric acid combine to form an aluminum chloride solution and carbonic acid. Or in an equation form: $$\ce{\text{__ } Al(...
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796 views

What are the products of the double displacement reaction of oxalic acid and cesium hydroxide?

A solution of oxalic acid is mixed with a solution of cesium hydroxide. This chemical reaction requires double displacement. I got this as my chemical equation: $$\ce{C2H2O4 + CsOH -> H3O + CsC2O4}...
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390 views

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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2answers
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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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4answers
5k views

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 ...