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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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Copper reaction with nitric acid

According to this paper, the green colour from the reaction of copper and nitric acid could be explained: The color is greenish, probably as a result of a combination of the pale-blue color of the ...
Seiji's user avatar
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Do d-orbital electrons shield each other or not?

"The shielding of one 4f electron by another is less than that of one d electron by another, and as the nuclear charge increases along the series, there is fairly regular decrease in the size of ...
Avish Bhatia's user avatar
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Why does balancing the oxidation of dichromate(VI) to chromium(III) require six iron atoms?

The problem: Balance the following chemical equation using oxidation numbers: $$ \ce{Fe^2+ + Cr_2O_7^2- -> Fe^3+ + Cr^3+} $$ What I have tried: $$\ce{\overset{+II}{Fe}^{2+}(aq) + \overset{+VI}{Cr}...
Nora's user avatar
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Is it possible to make thermite that detonates? [closed]

Why does thermite burn pretty slowly? Can it burn much faster if the components were ground to much smaller grain sizes? Can it be made to actually detonate--that is, the entire pile turning into ...
John Smith's user avatar
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What is the oxidation state of the two tin bonds in the below structure?

I understand that typically, ethylene as a ligand has a neutral charge and would not contribute to the oxidation state of the transition metal bound to it. However, I am seeing conflicting information ...
Marethyu's user avatar
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D-d splitting in transition metal ions

Cu+2 ion has total of 9 electrons in its 3d orbital. When it undergoes d-d splitting an electronic transition can take place between t2 and e as in {Cu(CN)4}-2 complex because of the presence of one ...
Tabi Khan's user avatar
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1 answer
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Smell of orange peel travels super fast

Many years ago, my college chemistry teacher squeezed an orange peel in the front of the auditorium asking us to raise our hands when we smelled it. Hands rippled through the auditorium (at least 40 ...
Greg's user avatar
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How to regenerate indium wires for vacuum seals?

I have a setup consisting in a vessel that eventually gets at low temperatures (approximately 85K - 87K) and needs indium wire as sealant. Unfortunately, we have to frequently open and close this ...
frappesco's user avatar
2 votes
1 answer
397 views

Chlorine monoxide formation

In World War 1, the chlorine gas was handled by some soldiers by damping their hankerchiefs into sodium carbonate solution. The article chlorine monoxide suggests that the reaction release chlorine ...
Seiji's user avatar
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Why does the nitrito ligand have a higher Δo than water in the spectrochemical series?

I collected some data to determine the value of $\Delta_\text{o}$ for a some transition metal complexes (attached) and I'm very confused as to why $\Delta_\text{o}$ for the $\ce{ONO-}$ ligand is ...
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Would ferrous ion give the flame test?

My question to ask is "Does $\ce{Fe^2+}$ ion give flame test?" Background: Last month, I gave the JEE exam and a question was as follow: Number of metal ions characterized by flame test ...
Aryan Sinha's user avatar
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Multiplicity and signals of cis−[(Ph3P)2PtF2] in two NMR spectra

I am interested in the number of the signals and their multiplicities in the $\ce{^{31}P\{^1H\}}$ and $\ce{^{19}F\{^1H}\}$ NMR spectra of $\ce{[\textit{cis-}(Ph3P)2PtF2]}$. It is given that $\ce{Pt}$ ...
MathEnthusiast's user avatar
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How are oxidation states of bioinorganic molybdenum/tungsten complexes determined?

Here a screenshot from our lecture on bioinorganic molybdenum complexes, dealing with the catalytic cycle of xanthine oxidase: It is said that the only biologically relevant oxidation states of Mo ...
Mäßige's user avatar
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1 answer
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Why are Mo(NR2)3 complexes isolobal with the nitrogen atom in N2

In a Molybdenum complex of the form Mo(NR2)3, the Mo is in the oxidation state of +3, leaving it with 3 d electrons. When combined with an additional 2*3 electrons from the ligands, this leaves it ...
Kirandk's user avatar
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2 answers
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In an unsaturated solution, is the product of ions still equal to Ksp?

Suppose I have a solution of a sparingly soluble compound, and consider its solubility in g/L. If I have less g/L of solution than that amount, it means the solution is unsaturated, but what happens ...
odin98's user avatar
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Estimation methods for temperature evolution of a high $\Delta H_{mix}$ dilution ($\ce{KOH}$ in water)

Question up front: Can temperature evolution in solutions be short-hand-estimated by simple state based calculations - with reasonable expectations of precision? (+/- 10° C) I am trying to calculate ...
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Why mono and dioxides of germanium,tin and lead are amphoteric

I get that group 14 elements show +4 and +2 oxidation states so they can form both ionic and covalent compounds and so they are amphoteric but monoxide means that these elements have to show +2 ...
Tabi Khan's user avatar
1 vote
2 answers
381 views

What is the hydrated diameter of a lithium ion?

When salts dissolve in water, the anions, cations, and strongly polar water molecules undergo hydration reactions, resulting in the formation of hydrated ions with a specific number of coordinated ...
陈永曜's user avatar
2 votes
1 answer
112 views

How do I find the amount of moles from the amount of units?

The problem: Find out the amount of moles of a certain substance knowing that the amount of units of said substance is $\pu{1.8E23}$. I have to find how many moles of carbon, hydrogen, and oxygen that ...
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Why do the carbonyl oxygens in EDTA not participate in coordination?

I recently had two, very brief lectures on coordination compounds. In those lectures, my teacher mentioned EDTA because of its importance in analytical chemistry and its very stable complexes and ...
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Transition of electrons between t2g and eg to give colour of coordination compounds

In the case of a hexaaquairon (III) complex, the iron (III) ion has 5 electrons, each singly occupying one d orbital. As the d orbitals are occupied, the vacant 4s, 4p and 4d orbitals are hybridised ...
Tabi Khan's user avatar
0 votes
1 answer
450 views

Why does balancing the reduction of dichromate(VI) to chromium(III) require four water molecules among the products?

Problem Balance the following chemical equation using oxidation numbers: $$\ce{Cr2O7^2–(aq) + HNO2(aq) –> Cr3+(aq) + NO3–(aq)}$$ Solution (in Swedish) $$\ce{\overset{+VI}{Cr}_2O7^2–(aq) + H\...
Nora's user avatar
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Bubbling air through hydrochloric acid to generate HCl gas

I am trying to build a system to generate dry HCl gas. I was wondering if you bubble air through diluted HCl will it produce a gas with mostly water vapor or HCL vapor, can we vary the proportions of ...
The Entity's user avatar
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Dot blotting immunoassay for visualizing the amyloid formation at different time points

We purchased the primary antibody approximately two months ago, and it has been stored in the freezer since then. Currently, we are attempting to assess its functionality through dot blotting. In our ...
Ash's user avatar
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1 answer
71 views

Is barium peroxide (BaO2) paramagnetic?

Is barium peroxide paramagnetic? I couldn't find find a credible source that states if it's paramagnetic or diamagnetic. I thought it must be cause it does have $\ce{O2^{-2}}$ in it but I'm unsure. ...
Substitute_Y's user avatar
1 vote
0 answers
138 views

Why exactly does copper have a higher melting point than zinc?

It is said that copper has a higher melting point than zinc because of the d electrons in copper being involved in metallic bonding. However, copper has no unpaired electrons in its d subshell just ...
wonderingwhy's user avatar
1 vote
1 answer
88 views

Is it not possible to prepare LAH using aluminium hydride?

Wikipedia lists this reaction for preparation of lithium aluminium hydride: $\ce{4 LiH + AlCl_3 -> Li[AlH_4] + 3 LiCl}$ But is it possible to prepare it by reacting aluminium hydride with lithium ...
Thecoder001's user avatar
3 votes
0 answers
91 views

Why is my Briggs-Rauscher reaction not oscillating?

I have been trying to run the Briggs-Rauscher reaction following this guide, which is pretty similar to other guides out there, yet the reaction is failing to not only oscillate, but display any color ...
user16791137's user avatar
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How to chemically remove niobium from boron carbide?

Previously I asked about chemical removal of CaO from boron carbide. I keep considering some refractory materials for use as sacrificial ones, so now I wonder if and how a layer of niobium (about 1.5 ...
akhmeteli's user avatar
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Does manganese dioxide disperse differently in bases than in water?

As part of a project in uni I've been given a task in my chemistry laboratory to synthesise manganese dioxide powders. I prepared a precipitate of it by reacting manganese chloride with sodium ...
A. Sreeram's user avatar
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0 answers
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Why hyperconjugation is called as σ to π* donation for alkenes and alkynes?

Why hyperconjugation is called as σ to π* donation for alkenes and alkynes if for C2 lowest unoccupied molecular orbital is σ2p not π*2p?
S K's user avatar
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1 answer
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Is salt formation catabolic or anabolic? [closed]

In class we learned that catabolic reactions are exergonic. I later checked that the free energy change of salt formation, $$\ce{2Na + Cl2 -> NaCl}$$ has a negative $\Delta G$. What explains this? ...
geneticscodingnoob's user avatar
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Water of Crystallisation in Borax and Copper Sulphate

The formula for borax is written as $\ce{Na2B4O7.10H2O}$ and also as $\ce{Na2[B4O5(OH)4].8H2O}$. From the structure, it obvious from where the 2nd formula comes. But the question I have is, what is ...
Sudarshan Kulkarni's user avatar
0 votes
1 answer
58 views

Electron configuration in benzene chromium tricarbonyl

I am not sure what is the electron configuration in benzene chromium tricarbonyl? From what I can work out, Cr is in 0 oxidation state (since all ligands are neutral). The complex is tetrahedral so ...
b20's user avatar
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2 votes
2 answers
118 views

Point group of trimethyl borate $\ce{B(OCH_3)3}$

What's the point group of trimethyl borate $\ce{B(OCH_3)3}$. The answer that my teacher gave is $D_{3h}$ but I'm struggling to see the n perpendicular $C_2$ axes and the horizontal plane of reflection....
Joe's user avatar
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3 votes
1 answer
120 views

Acidity of H4P2O7 and H3PO4

As given in pKa of H4P2O7 and H3PO4. The acidity of pyrophosphoric acid is clearly stronger than phosphoric acid. The two acid structures is given below. Thought: Consider the pyrophosphoric acid ...
Shira's user avatar
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3 votes
1 answer
99 views

Schlenk line simultaneously opening vacuum and gas

I’ve been working in the lab for some time now, but I’ve found conflicting information when asking this question, so maybe you know the answer. When working in a Schlenk line with double oblique ...
Mäßige's user avatar
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7 votes
1 answer
435 views

Mn(OH)2 synthesis

I have a small problem while reading Inorganic Chemistry Reference book. The book stated that "In laboratory, Mn(II) hydroxide was prepared by the reaction of Mn(II) salt with alkaline in ...
Shira's user avatar
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-2 votes
1 answer
54 views

How to chemically remove CaO from boron carbide?

Previously I asked (How to remove graphite substrate of boron carbide coating?) how to chemically remove a thick layer of graphite from a thin layer of boron carbide. It turned out that was a hard ...
akhmeteli's user avatar
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0 votes
0 answers
16 views

Copper Blackening Biproducts

Apologies in advance for what is likely an incredibly basic question. I am trying to form CuO from a Cu thin film using a bath of 1l DI water, 50g NaOH, 50g NaClO2. I am wondering what the biproducts ...
Ryan's user avatar
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-1 votes
1 answer
73 views

Effects on pressure on reverse electrolysis

I am interested in the effects on pressure of the following reaction. $$\ce{O2 + 4H+ + 4e- → 2H2O}$$ I have been trying to find data on this for a while, and I am sure that the information exists, but ...
Evelyn21's user avatar
0 votes
1 answer
163 views

Is it not possible to balance the equation $\ce{I2 +O3 -> I4O9 +O2}$ in many ways? [closed]

The above reaction can be balanced in many ways. For example, the coefficient of $\ce{I2}$ is two when coefficient of $\ce{I4O9}$ is one. But the coefficient of $\ce{O3}$ and $\ce{O2}$ can be 5 and 3 ...
Rassank's user avatar
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1 vote
1 answer
177 views

Why does AsH3 have a higher boiling point than HBr?

Aside from the general trend of the boiling points of the hydrides, I noticed how the group 15 hydrides somehow "overtook" the group 17 ones in boiling point, which felt weird. Notably, H-...
nothingham's user avatar
1 vote
2 answers
175 views

Stability of H3MnO4, H2MnO4, HMnO4

I cannot seek out the reason why while $\ce{H3PO4}$ (phosphorus oxidation +5) is relatively stable and obtainable but $\ce{H3MnO4}$ (the same oxidation state +5) is rarely mentioned and perhaps ...
Shira's user avatar
  • 473
-1 votes
1 answer
27 views

How do you perform an ion exchange of a monovalent cation with Br- counterion to a divalent or trivalent anion?

I tried to react an organic compound I have synthesized containing a di-N substituted imidazole bromide salt with Ag3PO4 with water at room temp to try to replace the Bromide with PO4(3-). I dont ...
toodles's user avatar
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3 votes
1 answer
151 views

Role of MnSO4 in permanganometric titration

This might sound like a stupid question, but I have been unable to wrap my head around it. Recently in a lab I had to titrate H2C2O4 with KMnO4 in acidic medium (H2SO4). However, in the work, it ...
confusionfromarizona's user avatar
4 votes
0 answers
294 views

Chemistry of Rutile, CdCl2 and CdI2

During lectures, we were told that 3d transition metal fluorides generally prefer a rutile structure. Chlorides prefer a $\ce{CdCl2}$ structure where $\ce{Cl-}$ adopt a CCP lattice and the metal ...
user85426's user avatar
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-1 votes
1 answer
66 views

what will happen if we add lithium cobalt oxide into water?is it true that molecule will break and lithium will make LiOH and CoO2? [closed]

I have tried to dissolve powder coated on cathode of lithium ion batteries.
Talha Ahmed's user avatar
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0 answers
151 views

Products formed on reaction of aqueous solution of iron(III) nitrate nonahydrate

Crystalline iron(III) nitrate nonahydrate, Fe(NO3)3.9H2O, has a very pale violet color. When added to water, the crystals dissolve to form a brown solution. Treatment of this brown solution with ...
Priyanshu Kumar's user avatar
0 votes
1 answer
56 views

Reaction kinetics exercise for hydrogen iodide synthesis

The rate constant for the reaction of hydrogen with iodine is $\pu{2.45E-4 M-1 s-1}$ at 302 °C and $\pu{0.905 M-1 s-1}$ at 508 °C. a. calculate the activation energy and Arrhenius preexponential ...
wengen's user avatar
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