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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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Why can't we just boil sodium carbonate solution to make NaOH?

To my knowledge, sodium carbonate dissasociates in water to form sodium bicarbonate and NaOH: $$\ce{Na2CO3 + H2O <=> NaHCO3 + NaOH}$$ Sodium bicarbonate decomposes at temperatures above 80 ...
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Disposal of activated carbon with adsorbed hydrogen chloride

TLDR: Adsorber vessel has activated carbon with adsorbed HCl gas, that needs to be emptied to conduct inspection. (12 tons) Heated purge (under N2, 200 C) can only get 75% HCl out, rest is not ...
15 votes
3 answers
2k views

How can I identify the material of this mystery gear?

I have this small gear which has sat on my desk for a couple years. I can't remember where it originally came from or what material it's made out of, so I'm hoping you can help me solve this mystery. ...
-2 votes
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Preparation of methyl red

I know that homework questions are not encouraged on stack exchange but I had to ask this as I couldn't get it's answer from any book and even Google. The question was given to us on preparation of ...
1 vote
0 answers
21 views

How predictable are the decomposition temperatures of trithiocarbonates?

How do the following parameters: Ionic radius of a cation. Oxidation number of a cation. Noble metal cation vs alkali metal cation. Something else that I may not know about. affect the decomposition ...
6 votes
1 answer
381 views

Thermal instability of sulfur and selenium iodides

After recent question about non-existent pnictide(V) iodides, I stumbled upon a similar issue in oxygen group. For example, $\ce{SI2}$ was reported to be found… but at the temperature as low as $\pu{9 ...
0 votes
1 answer
107 views

What reaction takes place when ammonia and sulfur dioxide are introduced into barium chloride solution?

What reaction takes place when gaseous $\ce{NH3}$ and $\ce{SO2}$ are introduced into $\ce{BaCl2}$ solution and an insoluble white solid is produced? I think that the white solid could be $\ce{BaSO4}$ ...
5 votes
2 answers
324 views

Using potassium dichromate and sulfuric acid to clean test tubes after Tollens’ test

We had an experiment at school to find out the biomolecules contained in the different foodstuffs. After doing Tollens’ test which turned out to be positive, our teacher instructed us to clean the ...
7 votes
3 answers
3k views

Nature of a1g Molecular Orbital Interactions in Ferrocene

While learning about ferrocene I've come across this molecular orbital diagram. What particularly confused me is the nature of the a'1g orbital. My professor taught that a'1g and e2g are considered ...
3 votes
1 answer
2k views

Second ionization energies of copper(Cu) and silver(Ag)

The ionization energies of copper and silver are First ionization energy: Cu-745.5 kJ/mol Ag-731.0 kJ/mol Second ionization energy: Cu-1958 kJ/mol Ag-2073 kJ/mol Now, looking at the ionization ...
-3 votes
1 answer
30 views

How to dissolve Copper sulphate in oils [closed]

We need to mix copper sulphate in certain oils to prepare an antiseptic oil. For that we need to dissolve copper sulphate in oils. How to do that?
7 votes
1 answer
440 views

Is there a selective wet etch of Bi2O3 Bismuth Oxide?

I'm looking for a wet etch of Bismuth Oxide that does not etch $\ce{Bi}$ itself. There are obviously chemicals that etch $\ce{Bi2O3}$, but $\ce{Bi}$ is pretty fragile, so almost everything I've found ...
5 votes
1 answer
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How to make a thin layer of crystalline barium titanate on copper substrate?

Is it possible to create a thin $\ce{BaTiO3}$ crystal layer on a copper plate by putting the plate in a beaker, pouring in heated hydrofluoric acid that has been saturated with $\ce{BaTiO3}$ powder ...
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2 answers
656 views

Calculating the potential of iron–copper electrochemical cell with Nernst equation

Calculate the ${E_\mathrm{cell}}$ (not ${E^\circ})$ at $\pu{25 °C}.$ $$\ce{Cu(s) | Cu^2+ (\pu{0.10 M}) || Fe^2+ (\pu{0.0030 M}) | Fe(s)}$$ $$ \begin{align} E^\circ(\ce{Cu^2+/Cu}) &= \pu{0.339 V} \\...
1 vote
2 answers
707 views

How would I find the molarity/concentration of a gas using pV = nRT?

The problem I'm working on is: At $\pu{1100 K}$ and a total pressure of $\pu{1 atm}$, $\ce{SO3}$ is $75.0\%$ dissociated. $$\ce{2SO3(g) <=> 2SO2(g) + O2(g)}$$ Assume $\pu{1.00 mol}$ of $\ce{SO3}...
2 votes
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Phase diagram of ammonium hydrosulfide, a volatile salt

Salts (ionic compounds) usually have low volatility due to the strong ionic bond. However, there are exceptions. Smelling salts decompose and release ammonia gas. What is "volatile"? If a ...
5 votes
2 answers
161 views

Synthesizing Cyclotetrazane from Hydrazine and Diazene?

Could cyclotetrazane — a compound with nitrogen atoms arranged in a square configuration — be synthesized? A hydrogen atom would be bonded to each vertex (nitrogen atom): Could cyclotetrazane be made ...
6 votes
1 answer
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What should be the IUPAC name of [(NH3)5Co-NH2-Co(NH3)4(H2O)]?

What should be the IUPAC name of $\ce{(NH3)5Co-NH2-Co(NH3)4(H2O)]}$? This is similar to $\ce{[(NH3)5Co-NH2-Co(NH3)5](NO3)5}$, i.e. μ-amido-bis[pentaamminecobalt(III)] nitrate. But the two parts are ...
66 votes
9 answers
41k views

Why do compounds like SF6 and SF4 exist but SH6 and SH4 don't?

Both $\ce{SF6}$ and $\ce{SH6}$ and $\ce{SF4}$ and $\ce{SH4}$ have the same central atom and the same hybridization, but my teacher specifically mentioned that $\ce{SH6}$ and $\ce{SH4}$ don't exist. I'...
8 votes
1 answer
9k views

Why can't NH5 form?

In ammonia a nitrogen atom forms 3 covalent bonds with hydrogen atoms and has one lone pair which can be used in a dative covalent bond with another hydrogen atom to form an ammonium ion. Instead of ...
-2 votes
0 answers
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Variation in electronic configuration [duplicate]

Why is the electronic configuration of platinum [Xe] 4f14 5d9 6s1 and not [Xe] 4f14 5d10 6s0?
5 votes
1 answer
5k views

Why is the chlorine missing an electron in chlorine monoxide?

I would draw the electron dot diagram structure for chlorine monoxide as follows: The correct answer is apparently with chlorine containing one unpaired electron: How would I know that? In the first ...
10 votes
0 answers
631 views

Identifying alkyl ligands as π-donors or π-acceptors in transition metal complexes

Is there a systematic way to identify an alkyl ligand as a π-acceptor or π-donor in a transition metal complex? Although various sources indicate that the weak field ligands are typically π-donors and ...
2 votes
1 answer
54 views

Does solubility product dictate predominant precipitate from the solution with several ionic compounds?

While removing temporary hardness through boiling, magnesium bicarbonate will give $\ce{Mg(OH)2}.$ $\ce{Mg(OH)2}$ predominates over $\ce{MgCO3}$ as the solubility product $K_\mathrm{sp}$ of $\ce{Mg(OH)...
4 votes
1 answer
17k views

Which half cell equation do you switch when calculating E° cell?

Given the following standard potentials calculate the overall $E^\circ_\mathrm{cell}$: $$ \begin{align} \ce{Pb(SO4)(s) + 2 e- &→ Pb(s) +SO4^2-(aq)} &\quad E^\circ &= \pu{-0.356 V} \\ \ce{...
1 vote
1 answer
40 views

Why is R₃P=O common but R₂Si=O rare? [closed]

I can understand why R₃N=O is 'rare' since for this double bond to form, Nitrogen would have to recruit a d-orbital like phosphorous does (the charge-separated model) but for N the d-orbitals aren't ...
4 votes
0 answers
658 views

Why isn't my Cu2O Cuprous Oxide red

A thin film sample of polycrystalline Copper(I) Oxide (Cuprous Oxide, $\ce{Cu2O}$) on quartz looks reddish in the center but bluish/grayish on the sides where the film is thicker. The same thin film ...
4 votes
0 answers
5k views

Why CO is a stronger and more common ligand than N2?

Both $\ce{N2}$ and CO are considered sigma-donors and pi-acceptors. Their molecular orbital diagrams are also similar, so why does CO generally bind more strongly and is a more common ligand?
3 votes
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27 views

Solubility or reactivity of tantalum carbide and potassium polyselenides?

It is probably an unexplored system, but is there anything known about the low temperature thermodynamic equilibrium state of this? By 'tantalum carbide', I mean $\ce{TaC}$, and by potassium ...
-1 votes
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33 views

Is the Trans Influence Truly Thermodynamic or part kinetic? If the starting complex is raised by a strong σ donor, won't the products be raised too?

I am a little confused about the trans influence and trans effect, but mainly the trans influence. I think I understand the trans effect as certain ligands being able to better stabilise the ...
11 votes
1 answer
292 views

What is this golden looking substance?

I am currently messing around with gallium compromising aluminum. I am using a titalium lock which is just a brand of aluminum padlock and I put a gallium-indium euctic alloy on the surface of it. It’...
-4 votes
0 answers
32 views

Presence of super rare compound Copper Peroxide?

So I'm trying to make copper acetate, and in equal parts 5% acetic acid and 6% hydrogen peroxide (slightly les H2O2 since higher concentration), I put a piece of copper metal. Immediately there was ...
3 votes
0 answers
30 views

Thermostability of Metal Carbonates and Nitrates

While studying in high school, I came across the following thermal decomposition reactions: $$\ce{Li2CO3 -> Li2O + CO2 }$$ $$\ce{MgCO3 -> MgO + CO2}$$ $$\ce{PbCO3 -> PbO + CO2}$$ $$\ce{Ag2CO3 ...
1 vote
1 answer
59 views

Manganese Oxidation States, Reverse Chameleon?

A well known experiment is where a basic sodium hydroxide and sucrose solution is added to a KMnO4 solution. The colors change from purple permanganate to green manganate to yellow/orange manganese ...
2 votes
1 answer
350 views

What materials are resistant to hot chlorine?

I'm looking to do an experiment involving hot chlorine gas (900 Celsius), however at the moment the only material I'm aware of that could cope with this is Hastelloy's C-22 alloy. What other ...
9 votes
5 answers
11k views

Are there any sodium salts that are insoluble in water?

Are there any sodium salts (e.g. NaCl) that are insoluble in water? If so, what are their approximate $K_\mathrm{sp}$ values?
-2 votes
1 answer
55 views

Hydrogen oxidation number

I am aware that since 2005, IUPAC guidelines established that hydrogen is more electronegative than all elements from group V in the periodic table (you can check official documentation). Thus, $\ce{...
-1 votes
0 answers
38 views

Xe-F bond lengths and geometry of XeF6 [duplicate]

My teacher states that the geometry (not shape) of XeF6 is distorted octahedral but according to VSEPR theory I conclude it should be pentagonal bipyramidal. Please tell why is there such deviation. ...
1 vote
0 answers
142 views

Is this Ferrous Chloride powder?

I recently ordered a 500g sample of Ferrous Chloride powder. However the powder is in light brown color, and on dissolving it in water, it gives a similar brown hue and it is not a clear solution. ...
3 votes
0 answers
65 views

With two reagents common on Mars, fluorite and CO2, how would I produce carbon tetrafluoride?

The hypothetical terraforming of Mars would require the heating of the atmosphere. A commonly suggested method is the in-situ production of fluorocarbons, powerful greenhouse gases. For example, ...
5 votes
1 answer
391 views

Abundance of sulfur containing compounds in the air

I noticed a piece of jewelry has tarnished, so I looked up information about silver tarnishing. I read that this is due to the formation of silver sulfide on the surface of my necklace and that the ...
10 votes
0 answers
19k views

Why does the reaction of sodium nitrate, aluminium, and sodium hydroxide yield ammonia?

From Russian test problem 4301: $$\ce{3NaNO3 + 8Al + 5NaOH + 18H2O -> 8Na[Al(OH)4] + 3NH3(g)}$$ How does ammonia evolve here? Is it that we get hydrogen gas evolving in the reaction between Al and ...
1 vote
1 answer
44 views

Need help with synthesis of iron (II,III) oxide (Fe₃O₄) nanoparticles

I am attempting to synthesize iron (II,III) oxide nanoparticles (Fe3O4). I have some iron acetate and have seen some literature where people have synthesized Cu nanoparticles using a polyol process. ...
-2 votes
1 answer
57 views

Solubility of lead carbonate

Lead nitrate reacts with sodium carbonate to form lead carbonate, if sodium carbonate is in excess will the white precipitate of lead carbonate dissolves ? Like in lead nitrate reaction with excess of ...
0 votes
0 answers
52 views

Behavior of polyanionic silicate chains in silico

I am trying to understand the stability of charged linear molecules, more specifically these, which contain periodically repeated high electron affinity parts, such as single-bonded oxygen (radicals). ...
-2 votes
0 answers
25 views

Coordination compound isomerism

In bridging complexes, an exchange of non-bridging ligands between two metal cations gives rise to coordination position isomerism. But what if there is an exchange of bridging and non-bridging ...
0 votes
3 answers
5k views

Is the magnitude of ionisation enthalpy and ionisation energy is same?

In my textbook it is written that ionisation energy and ionisation enthalpy are two different quantities. ionisation energy is the amount of energy provided to extract an electron from the outermost ...
3 votes
1 answer
181 views

Does chromium chromate -- Cr₂(CrO₄)₃ -- exist?

Is it possible to synthesise such a salt as chromium (III) chromate/dichromate? The intended formulas are $\ce{Cr2(CrO4)3}$ and $\ce{Cr2(Cr2O7)3}$ and they feature both trivalent and hexavalent ...
2 votes
1 answer
686 views

What is the difference between bond disassociation energy and lattice energy?

Bond disassociation energy refers to amount of energy required to break bonds of one mole of atom of particular type whereas lattice energy is the energy required to separate a crystal lattice ...
-1 votes
1 answer
78 views

What is the nature of the bonds in BaO2 (Ionic or covalent)?

My study material mentions that BaO2 has both covalent and ionic bonds, but doesn't provide any explanation regarding this.

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