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.

Filter by
Sorted by
Tagged with
0
votes
1answer
878 views

How to find the combining valence of an anion when it exhibits variable valency?

I'm doing an online course and can't for the life of me figure out how to write chemical formulas from the chemical name. Take the example of calcium chloride. I know the the valence for calcium is ...
2
votes
1answer
11k views

Bond dissociation energy order for C−C, N−N, O−O and F−F single bonds

Data from Chemistry LibreTexts — Strength of Covalent Bonds, Table 8.8.1: Average Bond Energies (kJ/mol) for Commonly Encountered Bonds at 273 K: $$ \begin{array}{cr} \hline \text{Bond} & D/\pu{...
1
vote
0answers
44 views

Why is molar extinction coefficient for dithiocyanatobis(triphenylphosphine)nickel(II) so high?

I recently looked at a data set where $\ce{[Ni(SCN)2(PPh3)2]}$ had 0 unpaired electrons (from magnetic moment calculation) which indicated to me that it was square planar. I wondered how it could have ...
2
votes
0answers
35 views

How to determine the number of π-electrons in a conjugated system from UV-Vis data?

Is there a way to determine the number of π-electrons in a conjugated system from UV-Vis data? I am modelling the electrons as particles in an infinite box of length $L$ equal to the length of the ...
1
vote
0answers
20 views

Determining the number of triphenylphosphine ligands in nickel(II) complex

A complex is synthesised by combining hydrated solutions of $\ce{NiCl2}$ $(\pu{0.6 g})$ with $\pu{1.35 g}$ triphenylphosphine $(\ce{PPh3}).$ After cooling the product precipitates as a solid with ...
3
votes
1answer
32 views

Why is there no salt bridge for hydrogen–silver bromide cell?

What is the reason there is no salt bridge for this cell? $$\ce{Pt(s) | H2(g) | HBr(aq) | AgBr(s) | Ag(s)}$$
1
vote
0answers
34 views

Green deposition on the anode after electrolysis of sodium bicarbonate solution in tap water

I use $\pu{12 V}$ battery with copper wires and tap water with $\ce{NaHCO3}$ dissolved in it. I connected the battery and everything went as expected but after 5 minutes bubbling stopped. I took out ...
-1
votes
1answer
45 views

Solubility of metal Hydroxides in excess Sodium Hydroxide (excess NaOH)

I recently came across a question which asked me to find out which metal hydroxides are soluble in excess $\ce{NaOH}$ solution. Number of hydroxides which are soluble in excess of $\ce{NaOH}$ among ...
0
votes
0answers
30 views

Why is magnesium sulfate more soluble in water than that of strontium and calcium sulfates?

Magnesium sulfate is soluble in water. Its solubility is $\pu{26.9 g}/\pu{100 mL}$ at $\pu{0 ^\circ C}$ $(\pu{35.1 g}/\pu{100 mL}$ at $\pu{20 ^\circ C})$.[1] However, both calcium sulfate $(\pu{0.21 g}...
3
votes
1answer
48 views

Why would substitution of H with D alter chemical shift?

The $\ce{^{119}Sn}$ chemical shift of the dimeric tin hydride shown below (R=terphenyl) changes on addition of $\ce{D2}$ from a 1:2:1 triplet at $\pu{657.9 ppm}$ (due to coupling between $\ce{Sn}$ and ...
1
vote
0answers
35 views

Can % location of electron on metal or ligand be negative (EPR)?

Given an EPR spectrum of [Co(3-methoxysalen)(py)] : and equations: A(x) = A(iso) + B A(z) = A(iso) - 2B %Co in SOMO = B/B0 where A(x) and A(z) are hyperfine coupling constants measured from the ...
0
votes
1answer
71 views

Calculating atomic mass of unknown element in given compound (gas) at STP

A gas $\ce{X2O5}$ has the density of $\pu{5 g L-1}$ at STP. What is the atomic mass of $\ce{X}$ given $A_\mathrm{r}(\ce{O}) = 16?$ Note: The problem is my homework for school and has been translated ...
-1
votes
0answers
61 views

The complex [Cr(NH3)6]3+ is a high or low spin complex?

Why is it correct to say that this complex $\ce{[Cr(NH3)6]^3+}$ is a high spin complex? I thought it was a low spin complex because $\ce{NH3}$ is a strong ligand, but in an exercise, I have to explain ...
0
votes
0answers
32 views

Why does dilithium have a longer bond length than dihydrogen?

I've tried MO theory however they both have a bond order of 1. Which means we can not relate the bond order to the bond length. My thinking - I think that the h2 bond length is shorter due to only ...
0
votes
2answers
125 views

Total entropy change for a spontaneous reaction

For the oxidation of iron, $$\ce{4 Fe(s) + 3 H2O(g) -> 2 Fe2O3(s) + 3 H2(g)}$$ the entropy change is $ \pu{–549.4 J K^{-1} mol^{-1}}$ at $\pu{298 K}.$ In spite of the negative entropy change of ...
-2
votes
0answers
15 views

Bond dissociation energy between phosphate group and deoxyribose in a nucleotide

I need to know the bond dissociation energy between C and O (phosphoester bond) between sugar and phosphate group in a single nucleotide in DNA. I will be really happy if anyone can guide me to any ...
-2
votes
1answer
44 views

Is mixture of ammonium hydroxide and ammonium nitrate a buffer solution? [closed]

Is a mixture of $\ce{NH4OH}$ and $\ce{NH4NO3}$ a buffer solution? I have seen some examples with $\ce{NH4OH}$ and $\ce{NH4Cl}$ but never $\ce{NH4NO3}$.
0
votes
1answer
64 views

Calculating the potential of an electrochemical cell (Nernst equation)

This is the problem: Calculate the ${E_\mathrm{cell}}$ (not ${E°}$) at 25°C. I found that the reaction is $$\ce{Cu(s) + Fe^2+(aq) -> Cu^2+(aq) + Fe(s)}$$ $\ce{Cu}$ gets oxidized and $\ce{Fe^2+}$ ...
3
votes
1answer
266 views

Ordering the reduction potentials for Cr3+, Mn3+ and Fe3+?

I have been asked to order, with explanation, the standard reduction potentials for the following: $\ce{Cr^3+ + e- -> Cr^2+}$ $\ce{Mn^3+ + e- -> Mn^2+}$ $\ce{Fe^3+ + e- -> Fe^2+}$ (all ions ...
4
votes
2answers
189 views

Lewis structure of dinitrogen trioxide

I have a confusion related to the structure of $\ce{N2O3}.$ I was taught 1 is the correct one, but I believe 2 is better since it has no formal charge on it. Why is 1 correct and 2 wrong?
-1
votes
1answer
58 views

Why is it that nitrogen hybridizes in ammonia, yet in F2, fluorine does not [closed]

It seems rather arbitrary to me that we have decided that nitrogen sp3 hybridizes in ammonia to stay consistent with VSEPR, yet that fluorine uses its 2p orbital to bond with another fluorine in F2 (I....
3
votes
0answers
28 views

Does β-hydride elimination in main group metals occur?

As a side reaction of Grignard reagents, the following reaction is introduced on the Internet. I think this is β-hydride elimination reaction, but magnesium is a main group metal, not a transition ...
1
vote
1answer
201 views

Why Inorganic chemistry reaction mechanisms are hard to find?

My textbook Chemistry Part 1,as in the attached photo states that[after the KClO3 reaction] “This reaction which apparently seems to be of the tenth order is actually a second order reaction. This ...
0
votes
0answers
17 views

Lattice Energy and Stability in s block compounds

Lattice energy decreases down the group but stability of the compound still increases why? For the purpose of this post I'll take alkali earth metal carbonate as an example. As we go down the group ...
0
votes
2answers
123 views

How does addition of AgCl affect concentration of iodide in KI solution?

In a mixture of $\ce{AgCl(s)}$ and initial $\pu{0.10 M}$ $\ce{KI}$, what is the $[\ce{I-}]$ after the reaction proceeds? Disclaimer: This is not a graded assignment, but rather a problem I'm trying to ...
0
votes
1answer
17 views

Are compounds which are used to seed clouds like silver(I) iodide hygroscopic?

I have read a teensy bit of the subject matter and the explanation they provided for silver iodide's ability to being a good site for ice to form is because of its size resembling an ice nucleus. How ...
1
vote
0answers
39 views

Chemically producing sodium metal from magnesium

Anyone with experience making sodium metal ($\ce{Na}$) with the following process? Reactants: $\pu{14 g}$ magnesium powder, $\pu{20 g}$ sodium hydroxide; Catalysts: $1$ to $\pu{2 g}$ menthol crystals; ...
-4
votes
2answers
44 views

Milliliters of NaBr when changing molarity [closed]

I was very confused by this problem. I was able to get the molarity, but I wasn’t certain how to go from there: If $\pu{2.60 g}$ of $\ce{NaBr}$ is dissolved in enough water to make $\pu{160.0 mL}$ of ...
1
vote
0answers
28 views

Does the anti-rust properties of bluing carbon steel disappear at a certain temperature?

Yesterday I blued my new carbon steel wok over a very high (200K BTU) burner which is capable of getting the wok to 1000+ degrees with ease. I understand that bluing adds a rust-resistant layer which ...
-3
votes
1answer
24 views

critical temperature and critical pressure condition data of Starch (Corn) [closed]

does anyone know where can I find the critical temperature and critical pressure condition data of Starch (Corn)?
1
vote
2answers
38 views

Why transition metal chloride complex have lower reduction potential than metal aqua ions?

Why transition metal chloride complex have lower reduction potential than metal aqua ions? For example: $$ \begin{align} \ce{Au^3+(aq) + 3 e- &-> Au(s)} &\quad E^\circ &= \pu{+1.52 V}\...
4
votes
1answer
291 views

IUPAC name of H[AuCl4]

Is $\ce{H[AuCl4]}$ tetrachloroauric [III] acid or hydrogen tetrachloroaurate[III]? As per the rules I have studied the latter name is correct. Then why am I getting the former name mentioned ...
5
votes
0answers
47 views

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 ...
3
votes
1answer
46 views

Why is hydrated beryllium ion acidic?

The beryllium ion, $\ce{Be^{2+}}$, forms the aquo complex $\ce{[Be(H2O)4]^{2+}}$. According to LibreTexts, this complex is acidic in solution: $$\ce{[Be(H2O)4]^{2+} + H2O -> [Be(H2O)3OH]+ + H3O+}$$ ...
-5
votes
1answer
47 views

variable oxidation states [closed]

which of the statements is true: looking at the electronic configuration of an element, can the possible oxidation states/oxidation number of an elemnet be predicted. for example, the valence ...
3
votes
2answers
83 views

Biological activity of the isotopes of the same element

I have a question regarding biological activity of different isotopes of the same elements, notably $\ce{^206Pb}$ and $\ce{^208Pb}$. Lead is known to be toxic, such that it can replace calcium from ...
0
votes
0answers
37 views

Are high spin complexes and spin free complexes the same thing?

While solving some Coordination Compounds problems, I came across a problem that asked Select which complex is high spin or spin free octahedral complex. The term 'spin free' sounds like a complex ...
3
votes
1answer
87 views

Why does green ferrous sulfate solution change color to yellow upon addition of hydrochloric acid?

I was demonstrating the formation of $\ce{Fe(OH)2}$ precipitate at school when the light green $\ce{FeSO4}$ I was using reacted with dil. $\ce{HCl}$ turned yellow. This only happened with dil. $\ce{...
-1
votes
1answer
38 views

How to calculate how much weak acid would dissociate in water?

So I know water has a pH of 7. If we add 0.1 mol of a strong acid inside 1 liter of water, it WILL fully dissociate into 0.1 mol of A- and 0.1 mol of H+ thus making the pH of the solution 1. But what ...
1
vote
1answer
7k views

Why basicity of oxides increases down a group?

Take group $13$ oxides as an example. The elements in this group are $\ce{B,Al,Ga,In,Tl}$. Boron oxide $\ce{B2O3}$ is acidic and $\ce{Al2O3}$ and $\ce{GaO3}$ are amphoteric while $\ce{In2O3}$ and $\ce{...
13
votes
2answers
16k views

Why does N₂ react with O₂ to Form NO at high temperatures?

This also raises questions that I have about the Haber Process which produces ammonia ($\ce{NH3}$) from molecular nitrogen ($\ce{N2}$) and hydrogen ($\ce{H2}$). I have heard multiple times that bond ...
0
votes
1answer
76 views

Salt analysis of Ag salts

So I was doing analysis of Ag salts and I found Agbr is curry white partially soluble in ammonia , AgI is yellowish and insoluble . BUT silver phosphate is also yellow . So can anyone tell whether or ...
14
votes
1answer
235 views

Does CN4 with the following structure exist?

I am a mathematician, not a chemist, so my questions are rather combinatorial. I am intrigued by the possibility of the following binary compound: $$\ce{\overset{-}{N}=\overset{+}{N}=C=\overset{+}{N}=\...
0
votes
0answers
39 views

How does the anti-bonding eg orbital (eg*) affect the bonding of ligands?

In the molecular orbital for octahedral metal-ligand complexes, there is an eg orbital and an eg* orbital. When the the d orbitals on the metal split, it will fill up some of the eg* orbitals I ...
33
votes
2answers
23k views

What do the prefixes meta, ortho, pyro mean in inorganic chemistry?

In inorganic chemistry, when is the prefix meta used? (as in metaborate and metasulphite) What about the terms pyro and ortho (as in orthophosphorous acid)? For example, I recently came to know about ...
2
votes
1answer
26 views

API formulations - are excipients required

I have the following API's Itraconazole, Ivermectin, Fenofibrate, Pyrvinium Pamoate,  Sulfasalazine, Artesunate,  All-Trans Retinoic Acid, Doxycycline,  Atovaquone,  Extremestane, Syrosingopine and ...
-3
votes
1answer
88 views

Determining iron content by titration

The redox reaction is $$\ce{KMnO4-(aq) + 8 H+(aq) + 5 e- -> Mn^2+(aq) + 4 H2O(l)}.$$ Where does $\ce{H+}$ come from in this reaction? What happened to $\ce{K+}$ in potassium permanganate?
8
votes
4answers
26k views

Why does nitrogen have a maximum covalency of 4?

As nitrogen has $1$ lone pair and $3$ electrons, either it should have maximum covalency of $5$ or $3$. But why does it have a maximum covalency of $4$ instead? Why did it leave $1$ electron? Why did ...
-4
votes
1answer
87 views

How to calculate pH of an CH3COOH solution? [closed]

please, does anyone know, how to properly (with calculation procedure) calcutate $\mathrm{pH}$ of an $\ce{CH3COOH}$, when you know only: -$\ce{CH3COOH}$ is 8% (water solution) -density of $\ce{...
1
vote
0answers
21 views

How to dissolve hardened aluminum silicate beads back into solution?

TLDR: We use the adsorber beads (which is essentially alumino-silicate beads) to adsorb some stuff from our process stream. The spent beads are dissolved in NaOH and sent to our wastewater treatment ...

1 2
3
4 5
83