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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Calculation of Degree of Dissociation from Ostwald's Dilution Law
A "weak" electrolyte, $\ce{A+B-}$, ionizes in solution as:
$$\ce{AB <=> A+ + B-}\tag{1}$$
$$ K_d =\dfrac{\ce{[A+][B-]}}{\ce{[AB]}}=\dfrac{(\alpha c_{0})(\alpha c_{0})}{(1-\alpha )c_{0}}=\...
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Ionic compound formation [closed]
Why do oxygen atoms differ in number in the compund Aluminate and Arsenate even they have the same suffixes ... Where Aluminate has 3 oxygen and Arsenate has 4 oxygen atoms.
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Unit cell structure of ionic crystal
I have a question about the structure of an LiH unit cell, and while this is related to a homework problem, it isn't the problem itself, I'm just looking for conceptual understanding. I've already ...
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Reaction of copper oxide with acid [closed]
Copper metal is less electropositive than hydrogen and thus less reactive. It is unable to displace hydrogen ions from a solution of sulfuric(IV) acid.
Why then would copper oxide or copper carbonate ...
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Bond strength of carbon compounds
I read online that C=O is more stronger than C=N and the reason behind this was, 'Since bond between C and O is more polar hence it will have a slightly higher ionic nature than C and N. As we know ...
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Basic Water Dissolving Salt Questions
I have a basic question about how water dissolves salt. In the Khan Academy explanation, it says that the H and Cl atoms attract each other while the O and Na atoms attract each other.
My question: ...
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Conditions for Complete hydrolysis of salt [closed]
My text book says that the cations (or anions) which are stronger than hydronium ion(or OH-) and their conjugate base (or acid) being very much weaker than water show complete hydrolysis.
While the ...
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Seeing solubility in various cases
Match the following:
$\begin{array}{|c|c|c|c|} \hline &\textrm{Column-I}&&\textrm{Column-II} \\\hline \textrm{(A)}&\ce{AgBr}&\mathrm{(p)}&\mathrm{(Solubility~in~water~is~more~...
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Are there ionic solids that conduct electricity?
We are taught in school that ionic substances don't conduct electricity, and when they do, it is either because they are in a molten state or because they are in solution. I understand these concepts.
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How can I remove the bitartrate anion from an organic bitartrate salt?
I have a compound, dimethylaminoethanol (DMAE) bitartrate, which I originally purchased as a supplement and possible smart drug. I bought an absurd amount of it. It didn’t do anything for me as a ...
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Covalent Bonds and Ionic Bonds [duplicate]
Covalent bond is a strong bond compared to Ionic Bonds but Ionic Compounds have higher melting and boiling points then covalent compounds. Why?
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How can ionic bonding in lanthanides occur without valence orbitals available for overlap?
I've recently been taught that the 4f orbitals in lanthanides are "core-like", supposedly meaning they have radius smaller than the 4d orbitals, therefore they are not available on the outside of the ...
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Why do ionic compounds form in the exact ratios that they do instead of more variable ratios? [closed]
I read that e.g. $\ce{Mg^{2+}}$ and $\ce{Cl-}$ come together because of electrostatic force or coulomb force and form an ionic bond. Then why is the formula $\ce{MgCl2}$? Why does one $\ce{Mg^{2+}}$ ...
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Why are stable ionic charges so strongly related to the group number?
Why do lighter elements have ionic charges so strongly related to the group number? For example, why does $\ce{Al}$ only show +3 ionic charge? The basic concept of stability in an ionic compound is ...
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How to account for the common ion effect on osmolarity quantitatively?
In adjusting the osmolarity of a solution of Benzalknonium Cl, Disodium Editate, and Disodium borate/boric acid buffer to be isotonic (about 290 mOsm), the addition of NaCl showed unexpected behavior, ...
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Can Ca and K exist as an ionic compound?
Recently in the Chemistry.SE chatroom a user posted this to celebrate the New Year:
Can Ca and K exist as an ionic compound? If not, why is it impossible?
Ca with atomic number 20, K 19
so 2019 -...
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Does brewing tea with hard water reduce the amount of bioavailable fluorine?
I read that brewed tea contains a relatively large concentration of Fluorine.
Fluorine can have negative health effects such as Skeletal Fluorosis. EDIT: I understand some Fluorine is necessary and ...
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Why does aluminum chloride have a higher lattice energy than aluminum fluoride?
From the table below (source: McMurry's Chemistry [1, p. 212]), it is evident that $\ce{AlCl_3}$ has a higher lattice energy than $\ce{AlF3},$ even though $\ce{F}$ is smaller than $\ce{Cl}$. Why is ...
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A question about nicotinamide adenine dinucleotide
In the structure of NAD+, why does the nitrogen of pyridine bind covalently to the the first carbon of glucose while the anion stabilizing the nicotine amide ion is the phosphate group? In other words,...
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Why are alkali metal compounds like sodium hydride or sodium amide strong bases but weak nucleophiles?
I understand why compounds such as $\ce{NaH}$ or $\ce{NaNH2}$ are weak nucleophiles: as they aren't very soluble in organic solvents, they react only on the clusters' surface. But why are they strong ...
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Clarifying question about chloride ions, water softening & corrosion
I have a question regarding the use of NaCl as a water softener.
Recently i was asked to comment on a series of test results from a water softening device were a lot of corrosion had occurred post ...
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Degree of dissociation of weak electrolyte at infinite dilution
Why the degree of dissociation of weak electrolyte is 1 at infinite dilution and how do we get the result? Like I know that at infinite dilution the concentration of solution is 0 but what does that ...
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What does higher electron gain enthalpy mean here?
While talking about ionic bonds my book states :
Higher the value of electron gain enthalpy of the atom, greater the ease of formation of the anion from it, i.e., other atom should have high value ...
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X-ray bombardment of CaCl2 and its resultant chemical changes
If one were to take $\pu{1 mol}$ of pure liquid Calcium Chloride (at $\pu{600 ^\circ C}$) and bombard it with $\pu{7.65 \times 10^{14} Ci}$ ($\pu{2.83 \times 10^25 particles}$) of x-rays ($\pu{75 keV}$...
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The "nose" of the periodic table [closed]
My teacher said that on the periodic table there is a "nose" formed by Al, Zn, Ag, and Cd. She said that they are all fixed charged (+3, +2, +1, and +2 respectively), and said that if I write them in ...
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Calculating the Ionic strength of sodium acetylsalicylate
With the addition of aqueous NaOH to an aspirin solutions in water the reaction will yield products of sodium acetylsalicylate and water. I would like to measure the amount of sodium apsirin formed ...
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Feasibility of using ionic liquid fuels in an MHD type reactor
First off I would like to say that my knowledge on chemistry, even general chemistry, is basic if not poor.
That said, I have some intuituions on this matter. I haven´t found any paper regarding ...
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Measurement of the lattice energy
The lattice energy of a solid ionic compound is the energy released when one mole of the solid compound is formed from its constituent gaseous ions at $\ce {298 K}$ and $\ce {1 bar}$. However, gaseous ...
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Determining which compound is more 'ionic'
I was going through my chemistry textbook (IB Pearson), and it explicitly stated that the higher the absolute difference between the electronegativity of elements in a binary compound, the more 'ionic'...
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Sulfate and carbonate ions as ligands
The pentahydrate salt of copper (II) sulfate exists as a blue solid while the anhydrous and monohydrate salts appear as white solids. The structures of these salts are discussed here. The blue colour ...
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Why is the product of the reaction "Bi + O2" Bi2O3 instead of Bi2O5?
I am stuck on a homework question that states:
A piece of solid bismuth is heated strongly in oxygen.
The answer key states the answer as $\ce{Bi + O2 → Bi2O3}$. However, it is to my understanding ...
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Lattice Energy of MX2 type
While finding the solution to the question that which among BaO and BaCl2 has hi that is energy I found that it was BaO whose lattice energy is high and there were explaining it just with charges. So ...
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What is dielectric constant and how does it explain the reason why water is one of the best solvents
When i was reading solublity of ionic compounds,they mentioned that polar compunds are fairly soluble in polar solvents and water is better solvent due its high dielectric constant.Can anybody explain ...
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Why don't ionic compounds show stereoisomerism?
When I was reading about crystalline nature of ionic compounds, I came across the statement that ionic compound doesn't show stereoisomerism. What does that mean and can anybody explain the reason ...
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Is it possible to burn things in a halogen atmosphere?
Fires can burn in oxygen. But, can they burn in halogen atmospheres (fluorine and chlorine only)? I am wondering this because combustion reactions involve oxygen and carbon and other elements. But, ...
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In the Lewis structure for barium fluoride, why does barium lose its valence electrons?
I searched for $\ce{BaF2}$ Lewis structure, and found out that the Barium atom loses its 2 valence electrons to form $\ce{F- Ba^2+F-}$.
Before seeing it I thought each of $\ce{Ba}$'s valence electrons ...
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Why is there no effective alternative to metal salts in antiperspirants?
Metal salts, especially aluminum compounds are used in antiperspirants to prevent sweating. I found out aluminum chloride hexahydrate, which is found in most antiperspirants, undergoes an acid-base ...
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Why does moving from left to right on the periodic table result in higher conductivity?
Question is in the title. I understand that the metals towards the left form stronger bonds with other chemicals compared to metals towards the right, and that the ones with weaker bonds break down ...
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How to determine the conductivity of different chemical compounds?
I am doing an experiment that involves testing the conductivity of three different chemical compounds dissolved in water. I will be testing Potassium Chloride, Calcium Chloride and Zinc Chloride. All ...
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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 ...
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Is calcium chloride an acidic or basic salt?
What I reason:
Calcium chloride is the salt of hydrochloric acid and calcium hydroxide. Calcium hydroxide is usually not considered a strong base, and I believe this is because of it's low solubility. ...
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What happens when an ionic compound is boiled? [duplicate]
Do ionic compounds such as NaCl become individual ions such as one Na ion and one Cl ion or are they hold together by ionic bonds even when they are boiled. Thanks in advance.
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Why is Lithium Chloride (LiCl) soluble in alcohols?
According do J.D. Lee's Concise Inorganic Chemistry, LiCl is soluble in alcohols because it has some covalent nature, althought it is mainly polar.
Why would LiCl have covalent character? Why doesn't ...
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Ionic equilibrium between multiple ions
This is a question from IIT-JEE 1993:
For the reaction
$$\ce{[Ag(CN)2]^- -> Ag^+ + 2CN^-}$$
the equilibrium constant at $\pu{298 K}$ is $\pu{4e-10}$. The silver ion concentration in a ...
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Gap in ionic radii
The above picture was shown in a presentation by my prof in inorganic chem as we were discussing ionic radii more in depth (all in pm). These are all isoelectronic radii. Notice the sudden leap in ...
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Calculating the strength of an ionic bond that contains poly-atomic ions
So the bond association enthalpy for ionic compounds like $\ce{NaCl}$ and $\ce{NaBr}$ can be easily calculated from a Born-Haber cycle. But the way a Born-Haber cycle is constructed it uses info that ...
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Ionic compounds and van der Waals forces
I'm having trouble understanding exactly what intermolecular forces occur in ionic compounds.
What I understand is that ionic compounds are held together by electrostatic interactions between ...
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Calling compounds electron deficient [closed]
I believe this is a conceptual question and might sound silly, but please help me with it:
I can understand when ions like $\text{Co}^{3+},\text{Mg}^{2+}$ are called electron deficient, because they ...
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Why does Coca-Cola Zero Sugar Contain Sodium Despite no Sodium Ingredients?
According to the Coca-Cola website and every label I read, Coca-Cola Zero Sugar is a mixture of organic compounds:
CARBONATED WATER (OC(OH)₂), CARAMEL COLOR (Various sugars), PHOSPHORIC ACID (H₃PO₄...
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Dissociation behaviour of polyelectrolytes
Assuming a solution of 100 polycationic molecules, each of them carrying 100 amino groups and an apparent pKa of 6.5. Would it mean that, at a pH of 6.5,
50 molecules will be fully protonated
50 ...
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