Questions tagged [inorganic-chemistry]

Inorganic compounds generally do not have C-H bonds, while organic compounds do have such bonds. The distinction between inorganic and organic chemistry, however, is far from absolute.

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1 answer
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What does $n$ represent in "hydrated compound⋅nH2O"? [closed]

On Wikipedia it is written that in "hydrated compound⋅nH2O" $n$ is the number of water molecules per formula unit of the salt. I don't understand what that means and this is indicated in ...
4 votes
0 answers
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Ferrocene's band gap is supposed to make it colorless but it isn't. Why is it so?

Wang and Islam [1] state that the ferrocene molecule's band gap, i.e. the HOMO-LUMO gap at the Kohn-Sham level, is 5.03 eV, which corresponds to an absorption wavelength of at most 240 nm. So, ...
0 votes
1 answer
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How do i know the order of the reaction? [closed]

$$\ce{2N2O5 ↔ 2N2O4 + O2}$$ is this reaction first order or second order ? And why ? I know first order is when duplicating the concetration the velocity duplicates too, and secod order reaction is of ...
1 vote
3 answers
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Can hydrogen fluoride form three or more hydrogen bonds? [duplicate]

As far as I know, each $\ce{HF}$ molecule has two hydrogen bonds, one formed by its hydrogen atom and one which the $\ce{F}$-atom forms with hydrogen atom of a third $\ce{HF}$ molecule. In other ...
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0 answers
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Stability comparison of europium(II) and ytterbium(II) ions

“Which one of the lanthanoids given below are most stable in divalent form?” This question was asked in JEE Main 2022 (Indian entrance test for engineering). Now the question had both $\ce{Eu^2+}$ and ...
-1 votes
3 answers
69 views

Does iron rust because of impurities found in it (ex. carbon)?

If we, theoretically, get a piece of ideally 100% pure iron and it is left in moist air? Will it rust? My understanding of iron rust is that the Iron itself becomes the ANODE and carbon impurities (as ...
1 vote
2 answers
96 views

What gives dilute/conc nitric acid/ conc sulfuric acid their oxidizing property?

I know that dilute sulfuric acid and very dilute nitric acid don't have any oxidizing tendency while dilute/conc $\ce{HNO3}$ and conc $\ce{H2SO4}$ do. Why do these more concentrated acids have this ...
0 votes
2 answers
64 views

How heating of iron results in formation of new compound? [closed]

Question: Which of the following processes results in the formation of the new compound? A. Dissolving common salt in water B. Heating water C. Heating of the platinum rod D. Heating iron rod I'...
5 votes
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Does the wavelength of light absorbed by a complex depend upon extent of splitting or stability?

Background: we were doing Crystal Field Theory in school when this question popped up. Specifically we were talking about stability obtained due to the chelate effect and if the extra stability in a ...
-2 votes
0 answers
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Well I know ions have same bond order but does it also mean there bond length is same too? [closed]

This is question regarding that if bond order is same then is it necessary to have bond lengths same and if not what is true order of bond lengths
8 votes
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Comparison of C=O bond strength in metal carbonyls

Find the weakest $\ce{C=O}$ bond among $\ce{[Mn(CO)6]+},$ $\ce{Fe[(CO)5]},$ $\ce{[Cr(CO)6]}$ and $\ce{[V(CO)6]-}.$ I thought the $\ce{C=O}$ bond strength would be lowest in $\ce{[V(CO)6]-}$ since the ...
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0 answers
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Fluoride coating of aluminum oxide [closed]

I'm currently reading into fluorine flow water filtration & desalination [1]. The idea is to use fluorines to have minimal friction to water while repelling ions. One of the use cases is using ...
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Why is the shielding effect of s-subshell more compared to that of p,d,f-subshell?

Screening effect: it is basically the repulsion of outer shell electrons by inner shell electrons Now, if we look at the above picture, $s$-subshell of the 3rd shell is farther away from electrons of ...
-2 votes
0 answers
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What kind of Spinel Structure is $Co^{2+}Fe^{3+}O_4$ [closed]

It's asked to me to calculate the magnetic moment of $Co^{2+}Fe^{3+}O_4$. My question is what kind of structure it is containing only one Fe. And does Fe takes tetrahedral site or octahedral site? ...
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0 answers
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Find concentration of ammonium and ammonia when 0.5 mL 25% ammonium hydroxide is mixed in 1 L H2O at 20 ºC

Doing an experiment where I do as the title says, but am struggling to know the right way to calculate the concentration of NH3 and NH4+. Ammonia 25% (Density: 0.91 kg/L, Mwt: 35.05 g/mol) One thing i'...
1 vote
0 answers
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Relationship between d group and $\Delta_O$ value found in Tanabe-Sugano diagram

So this question came up in class recently and got me thinking, is there any relationship between the metal d group and the $\Delta_O$ found for some allowed transition in Tanabe-Sugano diagram? I ...
-3 votes
0 answers
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How can compounds be mixture of compounds [duplicate]

My teacher told me that we can write $FeCr_{2}O_{4}$ as $FeO•Cr_2O_3$ . I am confused what does this mean. Probably $FeCr_{2}O_{4}$ is something like a mixture of $FeO$ and $Cr_2O_3$. But how is that ...
19 votes
2 answers
102k views

Why does the solubility of group II hydroxides increase and the solubility of sulfates decrease down the group?

I know that solubility of alkaline earth metal hydroxides increases down the group and solubility of alkaline earth metal sulfates decreases down the group. What is the reason for these trends?
4 votes
1 answer
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Which metal hydroxides are soluble?

Alkali metals (Li, Na, K, Rb, Cs) and the alkaline earth metals (Ca, Sr, Ba - sometimes Mg is included also) form hydroxides that are well-known to be soluble or at least slightly soluble and create ...
2 votes
0 answers
197 views

Why does Nitrogen Oxide NO exist? [duplicate]

The nitrogen oxide $\ce{NO}$ exists and has an uneven number of valence electrons. This is "impossible". Why does it exist? Why is it not dimerized? Nitrogen has 5 valence electrons and ...
-3 votes
1 answer
39 views

What does it mean finely divided aluminum?

Reaction of aluminum with oxygen Finely divided aluminum Burns with oxygen with a brilliant yellow flame at high temperature and produce white aluminum (aluminum oxide).
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1 answer
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The reaction of iron with sulfur to produce Iron(II) sulfide is inconvenient (for me)

I am taking a lot of iron properties this semester, but I have found some contradicting piece of information about the reaction of iron with nonmetals illustrated with two cases \begin{align}\ce{ **...
4 votes
1 answer
210 views

Relationship between molecularity and the reaction order

Should the molecularity be equal or less than the reaction order? Consider the reaction: $$\ce{H2(g) + I2(g) → 2 HI(g)}$$ If we consider the mechanism of this multi-step reaction, the molecularity is ...
-2 votes
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Will Laticrete's Spectralock 1 grout desilver a mirror's edges?

I make/sell mosaic mirrors. I'd like to use Laticrete's Spectralock 1 grout but I don't know if it will desilver the mirror's edges over time. I contacted both Laticrete and the mirror manufacturer to ...
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Why are hydrated oxide and hydroxide formulae used interchangeably for some metals?

I recently discovered that the Cr(OH)3 precipitated during group three testing in qualitative analysis is actually Cr2O3.xH2O. Why are these two formulae used interchangeably, and is there a list of ...
-2 votes
1 answer
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When a compound is soluble in a dilute mineral acid, is it necessary that it is also soluble in that concentrated acid?

For example, Barium Phosphate is soluble in dilute mineral acids. Does that also mean that it is also soluble in concentrated form of those acids?
1 vote
1 answer
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What are oxidation numbers of each element in CuH?

My chemistry teacher said hydrogen when bonded with metals has oxidation number (O.N.) of −1 except CuH: in CuH the hydrogen has O.N. +1 and the copper has O.N. −1. But on the internet it is ...
3 votes
2 answers
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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 is not so stable to ...
7 votes
1 answer
364 views

Is LiNbO3 a perovskite or not?

I am collecting a database of perovskite materials and could not decide if $\ce{LiNbO3}$ is categorized as perovskite or not. $\ce{LiNbO3}$ has been identified as a perovskite [1] as well as non-...
0 votes
1 answer
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Evaporation of zinc oxide

My question involves the evaporation of silicate material (e.g., rocks, minerals, geologic material), specifically I am trying to work the number of electrons (n) that are involved in the evaporation ...
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Are nitro and nitrito-N interchangeable in the IUPAC name of a complex?

I searched but couldn't find anywhere whether nitro and nitrito-N can both be used in the IUPAC name of an inorganic complex. For example, triamminetrinitrocobalt(III) and triamminetrinitrito-N-cobalt(...
2 votes
1 answer
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Conductometric titration curve plotting

In the conductometric titation of HCl vs NaOH, the conductance initially decreases, reaches a minimum at equivalence point, and then the slope of the curve becomes positive: Source: https://chart-...
3 votes
1 answer
110 views

Determining direction of equilibrium for metal complex

Determine if $K$ is greater or less than $1$. At first I thought the equilibrium would favor the right side because this could have to do with ligand binding where the negative charge would probably ...
0 votes
2 answers
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Why is there a charge on COOH⁻¹?

The dissociation of formic acid ($\ce{HCOOH}$) is: $$ \ce{HCOOH -> H+ + COOH-} $$ Why is there a charge on $\ce{COOH^{-1}}$ though? Is it achieved through: $$1\times(\ce{C^{4+}}) + 2\times(\ce{O^...
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Does manganese reacts with water at "not" standard conditions?

In my answer, I stated that manganese is said to not react with water under normal conditions although some sources say it reacts with water to liberate hydrogen gas. Does it implies that it reacts ...
0 votes
0 answers
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Does solid manganese reacts with atmospheric air when heated?

As discussed in my answer, manganese is not particularly reactive to air. The surface of manganese lumps oxidize to a minor extent but when it is finely divided, it becomes pyrophoric and burns in air....
1 vote
1 answer
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Why does the Shielding Constant of Orbitals in Slater's rule get higher, the further away we are from the electron we are considering?

My text material says: $\mathrm{Z_{eff}= Z-S}$ where $\mathrm{Z_{eff}}$ is the effective nuclear change on that specified electron; $\mathrm{Z}$ is the atomic number and $\mathrm{S}$ is the shielding ...
5 votes
2 answers
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Why are silver halides insoluble in nitric acid

The silver halides $\ce{AgCl},~\ce{AgBr},~\ce{AgI}$ are insoluble in $\ce{HNO3}$. This is given in J.D.Lee's inorganic chemistry text. (The strength of nitric acid is not specified though). But won't ...
5 votes
1 answer
173 views

Is Chromium(VI) fluoride able to be synthesized properly?

Chromium(VI) fluoride, also known as chromium hexafluoride is a possible chemical compound with a chromium atom attached to 6 fluorine atoms. It has been unsuccessfully synthesized a number of times ...
1 vote
1 answer
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The effects of acetic acid on porous concrete brick and mortar joints

I mistakenly applied a patio cleaner containing acetic acid to my porous concrete facing brick thinking it was biocide. The concentrate solution has a pH of 3 and I diluted it to one part concentrate ...
3 votes
2 answers
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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 $\ce{CaCO3}$ ...
3 votes
0 answers
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Can denticity and hapticity be defined simulaneously for a ligand?

I am freshly studying coordination chemistry. What I understand from denticity and hapticity is: Denticity - no. of electron donating sites in a ligand. Hapticity - no. of electron donating atoms in a ...
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0 answers
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Where can I find the released combustion energy in NASA CEA rocket problem?

I am using NASA CEA program for a study project. I have read the CEA Nasa user's manual over and over, yet I haven't found an answer to my question which is : where can I found in the output of NASA ...
1 vote
0 answers
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Buffer when testing soda with DCPIP

We are testing a range of sugary drinks (coca cola, orange juice, and chocolate milk) with DCPIP to detect vitamin C. The coca cola has given a false positive and we were wondering if this is due to ...
2 votes
1 answer
144 views

Comparison of enthalpy change for the dissolution of alkaline earth metal oxides

Compare the heat liberated per mole for the following reactions: $\ce{MgO + H2O -> Mg(OH)2}$ $\ce{CaO + H2O -> Ca(OH)2}$ $\ce{SrO + H2O -> Sr(OH)2}$ $\ce{BaO + H2O -> Ba(OH)2}$ Data for ...
0 votes
1 answer
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Which of these are more reactive: the lanthanides or aluminium? [closed]

I am not sure whether to consider the standard reduction potential or ionisation enthalpy. Which of these are more reactive: the lanthanides or aluminium?
-1 votes
1 answer
498 views

hydrated halide structure

What is the structure of $\ce{LiCl.2H2O}$? I think when $\ce{LiCl}$ is put in aqueous medium, it will break into $\ce{Li+}$ and $\ce{Cl-}$. Then $\ce{H2O}$ will give LP to Li and hydrate it. But why 2 ...
-5 votes
1 answer
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How does the amount of Calcium Carbonate in blackboard chalk influence its quality [closed]

Does the amount of calcium carbonate in chalk influence its charecteristics ? If so please mention them
1 vote
1 answer
112 views

Is potassium permanganate an oxidizing agent or is the permanganate ion the oxidizing agent?

I have seen both potassium permanganate and the permanganate ion being called the oxidizing agent. Isn't it more appropriate, however, to call the permanganate ion the oxidizing agent only as the ...
2 votes
3 answers
312 views

Why do we sometimes change the sign for standard electrode potentials?

Question: In this cell, the copper is oxidized and $E_{cell} = \pu{+1.15 V}$. $$\begin{align} \ce{Cu^2+(aq) + 2e− -> Cu(s)} & &(E &= \pu{+0.34 V})\\ \ce{Mn^3+(aq) + e− -> Mn^2+(aq)} ...

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