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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Can we assume that the ionic bond equilibrium separation distance is simply the sum of the atomic radii?

Background I am reading a materials science textbook. The current section is discussing ionic bonds and the attractive/repulsive forces between ions. The attractive force between ions is given as $$ ...
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86 views

What is the structure of sodium chloride in the liquid state?

I understand that sodium chloride when solid, is a lattice, so NaCl there is an empirical formula,(so, expresses that the ratio of Na to Cl is 1-1), and not a molecular formula expressing exact ...
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Why are group 13 compounds in the +1 oxidation state more ionic than those in the +3 oxidation state?

I know that for group 13 metals in the p block, the stability of +1 OS is generally more than the stability of +3 OS as it is energetically not favourable to attain the higher OS of +3 and such ions ...
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42 views

Why does $\mathrm{NO_3}$ have charge $1-$? [closed]

I'm given the following problem: Write the molecular equation for the reaction $\mathrm{Iron\;(III)\; Nitrate\; and\; Sodium \;Phosphate}$ I begin by attempting to determine the empirical formula of ...
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27 views

What are the Ionic Properties of Co-ordinate Covalent Bonds? [closed]

In my 10th grade book, it says that A coordinate bond has properties of both covalent and ionic bonds. Therefore, it is also called dative or co-ionic bonds. I understand that it has properties of ...
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43 views

Isn't my book doing this problem about ionic product wrongly?

Problem: After adding a $\pu{150 mL}$ $\pu{6.7\times10^{-5} M}$ $\ce{NaOH}$ solution to a $\pu{100 mL}$ $\pu{2.5\times10^{-5} M}$ $\ce{FeCl2}$ solution, green colored $\ce{Fe(OH)2}$ precipitate is ...
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85 views

If bond types are in reality intermixed, how come different bonds form completely different structures?

According to the bond triangle, compounds don't exist as solely ionic or solely covalent, but rather have ionic, covalent, and metallic character to them. So each bond type is connected and similar in ...
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39 views

Dissolution of ionic compounds

Where can I find a table that lists the rates of dissolution of common ionic compounds like sodium chloride, potassium permanganate, and ammonium nitrate? Are there tables and equations that relate ...
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74 views

Are there any binary ionic compounds with carbon in it? [closed]

It may be organic, may be inorganic but is ionic and binary in nature and contains carbon. Is there any such compound?
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Linearity of membrane resistance and contact resistance overvoltages in proton-exchange-membrane-water-elektrolyzer-cells (PEM-WE)

I am questioning why the cell component's resistance to the electrons (contact resistance) and protons (membrane resistance) flow follow the ohmic law. This assumption is made in recent papers on PEM-...
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131 views

Isn't hydrogen chloride a salt, because it is an ionic compound? [closed]

So I just learned in chemistry that salts are ionic compounds. Shouldn't, $\ce{H+Cl-}$ be a salt since hydrogen ion has positive charge and chloride ion has negative charge? If $\ce{HCl}$ is a salt ...
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What is the correct molecular, total ionic, and net ionic reaction equation of reaction between magnesium nitrate and sodium chromate? [closed]

From the question, I think that the reactants are $$\ce{Mg(NO3)2(aq) + Na2CrO4(aq)}$$ But the problem is, I am confused about the result of the reaction. Is it $$\ce{MgCrO4}$$ and/or $$\ce{NaNO3}$$? ...
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98 views

Databases for Enthalpy of Solution and Ionic Radii for Ionic Salts

I am looking to investigate the relation between experimental enthalpies of solution and theoretical enthalpies of solution calculated using theoretical equations for the lattice enthalpy and ...
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2answers
240 views

Does lithium form ionic hydride? [duplicate]

It is stated in my chemistry textbook that lithium indeed forms lithium hydrides. However, significant covalent characters could be found in lithium hydrides (like least reactivity). But in some other ...
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96 views

Why is the thermal stability of calcium carbonate higher than that of magnesium carbonate even though lattice energy decreases down a group?

The difference in thermal stability of $\ce{CaCO3}$ and $\ce{MgCO3}$ can be explained using Fajans' rules, but why not using the lattice energy method? Why is the thermal stability of $\ce{CaCO3}$ ...
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Determining ion charge using rate constants and ionic strength

I am given the following data: The rate constant $k$ at $\pu{25 ^\circ C}$ in a reaction of persulfate ions and iodide ions in a water solution is assumed to vary with the total ionic strength of the ...
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117 views

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} $ $\ce{2NO2 \to N2O4}$ ...
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279 views

Can chemical composition be determined from elemental composition?

I have the energy dispersive X-ray spectroscopy results from a sample of salt that I produced by collecting and processing ocean water by filtering, boiling, evaporating, and additional steps to try ...
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382 views

Why is it advised to use neutral ferric chloride solution while performing confirmatory test for acetate ions? [duplicate]

The reaction of $\ce{FeCl3}$ with $\ce{CH3COO-}$ is $$\ce{3Fe^{+3} +6CH3COO- +H2O<=> [Fe3(OH)2(CH3COO)6]^{+} +2H^{+}}$$ Recently I read that a solution of $\ce{FeCl3}$ hydrolyses very quickly to ...
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1k views

Why are entries missing on a solubility data chart for ionic compounds? [closed]

There is a solubility chart in my college chemistry class text for "Solubility of Ionic compounds in water". I have copied and pasted image of chart below. I was surprised to find a dozen ...
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102 views

Calculating the ionic strength for an aqueous solution containing potassium ferricyanide and sodium sulfate

I have the $100$ microM of K$_3$Fe(CN)$_6$ is dissolved in water and the following data: $$\begin{array}{c|c} \text{Experiment} & \ce{[Na_2SO_4]}/\pu{M} \\ \hline \mathrm{A} & 0 \\ \mathrm{B} ...
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388 views

Why does the dissolution of calcium hydroxide have a negative entropy?

We had an experiment on the dissolution of calcium hydroxide and we obtained the experimental entropy value $\pu{-203 J mol^-1 K^-1}$ with a percent error of $26.7\%.$ Doesn't dissolving a solid in a ...
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80 views

Forces operating in molten ionic solids

What type of forces exist between ions in molten ionic solids? If this force is electrostatic attraction only, then how is it different from electrostatic interaction when ionic compound exist as ...
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112 views

Calculating the ionic strength of a histidine solution

I'm trying to repeat the calculation of the ionic strength of a solution containing histidine as a buffer I recently read in a paper. In their paper, the authors calculate the ionic strength of a 20 ...
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68 views

Is ionisation an equilibrium process?

I read in a page that ionisation is an irreversible process. But, as equilibrium is always reversible would that mean equilibrium does not involve ionisation process. And than dissociation is a ...
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738 views

Determining whether a compound is ionic or molecular in nature [closed]

$\ce{HCl}$ is a molecular compound because there is a covalent bond between $\ce{H+}$(a proton) and $\ce{Cl-}$ (a chloride ion) $\ce{NH4NO3}$ is an ionic compound because there is an ionic bond ...
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127 views

What force causes an electron to jump from say Na to Cl?

Every explanation I can find says something like: valence electrons in metals have low ionising energies and non-metals ''want'' to complete their valence shell. But I can't seem to get my head around ...
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73 views

Do hydrides, like NaH or CsH, also form H-bond? [closed]

I know that when hydrogen acts as a cation, it can form H-bonds with the electronegative ions or groups. But, is this also true for anionic hydrogens? Will they form similar bonds, other than the ...
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1answer
33 views

Would ionic conduction be halted by shielding at the electrodes?

I've done this experiment myself and seen it front of my eyes. Set up a basic circuit with a battery, an LED, and connect the circuit with a salt-water solution and copper wire. The LED lights up. If ...
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Why does beryllium have an exceptionally high hydration energy?

You would expect solubility of Group $2$ fluorides to increase down the group, as lattice energy plummets much more sharply than hydration energy does. For the most part, this is true: $\ce{BaF2}$ is ...
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Is this analogy right? [closed]

Is my logic correct in this case ? Since the formal charge represents the charge the element possess in a covalent compounds, is it right to say that formal charge is the equivalent term for covalent ...
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1answer
98 views

Are Group 2 metal fluoride salts less soluble in organic solvents than Group 1 fluorides?

It is clear that Group 1 metal fluoride salts DO NOT readily form solutions in organic medium. The amount of solvation that can occur leading to the eventual release of a fluoride ion depends on many ...
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208 views

How do I calculate weight percent of BaCl2

A $\pu{0.1036 g}$ sample containing only $\ce{BaCl2}$ and $\ce{NaCl}$ is dissolved in $\pu{50 mL}$ of distilled water. Titrating with $\pu{0.07916 M}$ $\ce{AgNO3}$ requires $\pu{19.46 mL}$ to reach ...
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128 views

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 ...
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Dielectric constant for gases possessing van der Waals forces [closed]

I've learnt that water can dissolve ionic bonds because it possesses a high dielectric constant. In the cases of covalent compounds (especially the non-polar covalent compounds), where the molecules ...
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1answer
1k views

Finding the atomic packing factor (APF) of Sodium Chloride and other FCC ionic compounds

For a piece of coursework I am doing, I need to calculate the atomic packing factor of some ionic compounds. I have had no formal teaching in this area, so what I know comes from information I have ...
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276 views

charge density as a measure of lattice enthalpy & polarizing power?

My official CIE A level textbook, and some mark schemes mention the following: Ions with the same charge have a lower charge density if their radius is large. This is because the same charge is ...
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853 views

Understanding strong acid titrated with weak base graph

I don’t understand why the conductivity doesn’t change after the equivalence point. To my understanding, at the equivalence point there is $\ce{NH3}$, $\ce{NH4+}$ and $\ce{Cl-}$ in the solution. As ...
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1answer
297 views

Why is the ionic radius of hydride so large?

The order of ionic radii for halides and hydride is apparently as follows: $$\ce{F-} < \ce{Cl-} < \ce{Br-} < \ce{H-} < \ce{I-}$$ Why is the hydride ion so large, even larger than bromide ...
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44 views

A trick to find resultant pH [duplicate]

Consider the following problem: Find the $\mathrm{pH}$ of the solution formed by the mixing of two solutions of $\mathrm{pH}$(s) $2$ and $3$ of equal volumes. The normal way: Since the resulting ...
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1answer
76 views

Is there a notion of generalized acidity for lithium ions?

From my understanding, the basic notions of acidity can be explained by considering a cup of pure water, and then adding a substance to it which creates either free $\ce{H+}$, or free $\ce{H3O+}$ and $...
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Expression comparing the Solubility of Ionic compounds

In chemical bonding, I am taught an expression that compares the Solvation Energy and the Lattice Energy of an ionic compound which is being dissolved in a polar solvent (could be water, could be ...
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1answer
678 views

Does boron form compounds without covalent bonds?

I have read that boron, due to the very high sum of its first three ionization energies, it is not able to form its +3 ions, and thus it generally forms only covalent compounds. But in a popular ...
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563 views

Order of solubility of sodium halides and potassium iodide

Order the following ionic compounds in decreasing order according to their ease to dissolve in water. a) NaBr; b) KI; c) NaF; d) NaCl. d > a > b > c a > b > c > d b > c > d &...
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101 views

Is there a room temperature ionic liquid permanganate [closed]

I need to figure out a permanganate based ionic liquid that is usable at room temperature. Unfortunately, information on which compounds could be usable and which ones aren't is scarce. That's why I'm ...
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1answer
61 views

When converting between a hydrated electrolyte amount in mass and in milliequivalents (meq), why are the water molecules taken into account?

A textbook I'm reading called "Ansel's Pharmaceutical Calculations, 13th edition" defines the milliequivalent (meq) thus (p. 187): This unit of measure is related to the total number of ...
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33 views

What kind of bond exists between a metal and a non-metal with a difference in electronegativity of less than 1.7? [duplicate]

I'm being taught that the kind of bonds that exist between elements depends on the electronegativity difference between the elements. A difference less than 1.7 is covalent and a difference higher ...
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1answer
156 views

How does a body lose electrons? [closed]

If there is a Na and cl in solid form , There will be atoms inside of them.How do they lose electrons ?.We know solid body has a structure and covering.Just like you can touch is the covering of table ...
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2answers
118 views

When writing the net ionic equation, if one of the products ionizes, what is the most appropriate way to account for this in the answer?

Take these two practice problems and their solutions from Ebbing (8th ed) that involve completing the molecular equation, then writing the net ionic equation: 4.42a: $\ce{Ca(OH)2(aq) + 2H2SO4(aq) ->...
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263 views

Why does lattice enthalpy decrease with increasing ionic size?

Lattice enthalpy decreases as ions get larger, but I have found two explanations: The charge density is greater in smaller ions, so greater attraction The ions are themselves able to get closer ...

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