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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103 views

Is carbon–sodium bond mainly ionic or covalent?

We all know that carbon mostly forms covalent bonds (almost always) and sodium mostly forms ionic bonds (almost always). But if $\ce{NaOH}$ reacts with ethyne, then $\ce{HC#CNa}$ and $\ce{H2O}$ are ...
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1answer
25 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 ...
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How to know dichromate is being reduced from Cr⁶⁺ to Cr³⁺?

When potassium dichromate is being used as an oxidising agent, it gets reduced from chromium(VI) to chromium(III). Is there any way to know that or calculate that other than being familiar with ...
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How to measure saturated salinity and mineral levels for flaked sea salt?

I am a sea salt enthusiast looking to make the perfect flakey sea salt. I start with sea water and boil it down to a thick brine. Then with less heat I reduce the brine more slowly and inverted salt ...
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0answers
33 views

Phosphine inner structure problem [duplicate]

We all know that phosphine $\ce{PH3}$ is a Drago's molecule. Now, I have heard in my class lecture that since phosphorous is a large atom, it doesn't undergo steric crowdance like $\ce{CH4}$. Thus, ...
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How come we can't use the equivalence point equation of NV=NV in this problem?

So, the problem is you prepare to standardize a $\ce{Na2S2O3}$ solution. $\pu{32 mL}$ of $\ce{Na2S2O3}$ solution is titrated into $\pu{50 mL}$ of a $\pu{0.01 M} \ \ce{KIO3}$ solution to reach the ...
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Symmetry Adapted molecular orbitals of Formaldehyde

I am currently trying to find the Symmetry Adapted linear Combinations (SALCs) of Formaldehyde $\ce{H2C=O}$, and use the 1s orbitals on the hydrogen atoms, and 2s, 2px, 2py and 2pz orbitals on the ...
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2answers
865 views

Considering the d-d transition how, does tetracyanidonickelate(II) ion exist as a colored complex?

As I refer on google, the resources indicated that, the d block elements which have unpaired electrons as in their ions, when they are making complexes with ligands, they can absorb different ...
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1answer
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Explaining the colour change in the potassium permanganate titration of iron(II) ions

In the redox titration: $$\ce{MnO4- + 8 H+ + 5 Fe^2+ -> Mn^2+ + 4 H2O + 5 Fe^3+}$$ the colour change which occurs is purple to colourless, because of the decreased concentration of permanganate ...
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1answer
65 views

Why is dinitrogen tetroxide a planar molecule?

Why is $\ce{N2O4}$ a planar species in spite of having a σ-bond in between two $\ce{N}$ atoms for free rotation? Does it not form a conformer? Any clarification would be appreciated.
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1answer
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Is silicon dioxide decomposition possible?

I was thinking about this, I made Gibbs free energy calculations and I can't figure out if $$\ce{SiO2(s) -> Si(s) + O2(g)}$$ is actually possible, even at a ridiculous high temperature.
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1answer
390 views

Reason for shorter bond between sulphur and oxygen?

I recently came across this sentence in my textbook: the bonds between sulphur and oxygen in oxides of sulphur ($\ce{SO2}$ and $\ce{SO3}$) are much shorter than might be expected for a single bond. ...
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316 stainless steel and high concentration, high temperature Hydrogen Peroxide

I'm looking at doing some experiments with small scale rocketry and I need to find the right materials for this project, where I will be burning through lots of HTC (peroxide above 90% concentration). ...
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2answers
133 views

Reactivity and its meaning

When we say that “potassium” is reactive, are we referring to a potassium atom or bulk potassium as in the solid metal? In other words does “potassium” refer to a type of atom or an agglomeration of ...
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2answers
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Difference between backbonding and hyperconjugation and conjugation [closed]

What is the difference between backbonding and hyperconjugation and conjugation? I mean the basic differences as all are concerned with donation of electrons. What is the most striking effect of each ...
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Dissolving hydrated vs non-hydrated salts

in chemical catalogs, salts are often sold in hydrated and non-hydrated versions. Like sodium sulfate anhydrous and sodium sulfate decahydrate. I tried dissolving the anhydrous and it didn't ...
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32 views

Does it make sense to have a control group for a school chemistry experiment?

I'm wondering if it makes sense to have a control group for the following experiment: measure the speed of gas produced when hydrochloric acid and calcium carbonate react, as a function of surface ...
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What is the structure of XeF6? [duplicate]

Doubt I searched the net and found the following result: But why is the lone pair placed in equitorial? Shouldn't it be placed in axial? Afterall equitorial bond angle is 72° while axial is 90°.
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21 views

Basicity order of 2nd group oxides

It's a general trend that basicity of oxides decreases down the group. But recently I came across a statement "the basicity of second group oxide decreases down the group and decrease in basic nature ...
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1answer
2k views

Why is KOH less soluble than NaOH in alcohols?

Alkali metal hydroxides solubility in water increases down the group. Because the mechanism of dissolution is the same in alcohols, why the anomaly?
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44 views

Why are sulphide salts of p and d block coloured?

I have studied that sulphide salts of s block are colourless while p and d block salts are coloured. But colour intensity of a salt is directly proportional to polarisation in salt. And s block ...
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15 views

The molecular diagram of the Boron hydrogen bond (B-H)

In class today, we had a discussion about the bond between boron and hydrogen and we drew it like this(The pictures on the right are the corresponding molecular orbitals): The argument was that 2s ...
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1answer
21 views

Can MCM-41 (mesoporous materials) be used for ion exchange?

Wikipedia, and this journal article talk of a microporous and mesoporous material MCM-41. Although MCM-41 has dynamic sized pores which can be changed, but it is hydrothermally unstable. Can this ...
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2answers
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Why is neodymium the most paramagnetic lanthanide?

My textbook says that paramagnetism rises to a maximum in neodymium. I don't understand how gadolinium has 8 unpaired electrons, whereas neodymium has only 4. Shouldn't paramagnetism be higher in ...
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Inorganic IUPAC for Compounds with bridged ligands?

Can we use bis(tetraammine) instead of octaammine is the 2nd example ? As in the 1st example they used bis(pentaammine) and also in the 3 one the used bis(carbonylcyclopentadienyliron)
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2answers
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Do all metal salts in aqueous solution contain metal aquo complexes?

I know that nickel nitrate in aqueous solution contains the metal aquo complex ion $\ce{[Ni(H2O)6]^2+}$. But do all metal salts in aqueous solution contain such complex ions? If not, on what factors ...
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Interference of Ca-EDTA with fluoride delivery in mouthwash

The goal of fluoride mouthwash is to deliver $\ce{F-}$ to the surface of the teeth to turn hydroxyapatite in the dental enamel into fluorapatite. Typically sodium fluoride or stannous fluoride are ...
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5answers
31k views

What is the chemical structure / hybridization of sulfuric acid?

I was looking at the chemical structure of $\ce{H2SO4}$. Intuitively, I would have expected this molecule to be square planar in accordance with $p^2d^2$ or $sp^2d$ hybridization, but instead it is ...
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2answers
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How to measure the color of honey? [closed]

After doing some research, I found that honey's color could be a factor of climate. I am very interested in this subject and I'm a high school student so we don't have as much apparatus as you would ...
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1answer
84 views

Terminology for describing nuclei participating in metallic bonds

I've read many times that in metals (for example sodium metal), what constitutes the crystal lattice is an arrange of atoms, since no electron is given or lost, they are just shared between all the ...
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1answer
86 views

Making hard water

Does anyone know how to make hard water with a hardness of 200+ ppm in terms of $\ce{CaCO3}$? I live in Seattle and we have very soft water and we need hard water for testing purposes. Obviously you ...
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Effect of charge density on electrolysis of dilute sulphuric acid

I am told that if electrolysis of dilute sulfuric acid is performed under high charge density, then the following reaction takes place at anode instead of evolving oxygen: $$\ce{2 HSO4- -> H2S2O8 +...
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1answer
111 views

Why does HgCl2 react with HCO3^- but not with CO3^2-?

I have started learning Qualitative Salt analysis recently. When I was reading about tests to distinguish $\ce{CO3^2-}$ and $\ce{HCO3-}$, I came across a line in a book which states $\ce{HgCl2}$ ...
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2answers
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Can aqua regia work with sources of chloride and nitrate other than hydrochloric acid and nitric acid?

According to Professor Poliakov and a question on Chemistry Stackexchange here, gold dissolves in aqua regia because the nitrate ion oxidizes the gold into $\ce{Au^3+}$, and the chloride bonds to the ...
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28 views

Extent of Hydrogen bonding in H2O2

Several books that I have read say that in $\ce{H2O2}$ the degree or extent of H-bonding is 6 as each H atom would form 1 and O atom would form 2 H-bonds respectively. However if we look at HF the no....
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What is the role of hydration enthalpy in oxidation?

My textbook says that the greater oxidizing behavior of fluorine than chlorine can be attributed to the high hydration enthalpy of F ions and the low dissociation enthalpy of F-F bond. While the ...
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3answers
10k views

Hybridization of nitrogen in trisilylamine, (SiH3)3N?

I want to know the hybridization of the central atom in $\ce{(SiH3)3N}$. I think it should be $\mathrm{sp^3}$, because $\ce{N}$ is attached to three silicon atoms and one lone pair. But actually it ...
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1answer
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if we mix bleaching powder in water will this be converted to Sodium Hypochlorite? [closed]

if we mix bleaching powder in water will this be converted to Sodium Hypochlorite ?
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What exactly are the frontier orbitals in diradical species like O2?

I read about frontier orbitals, namely HOMO, LUMO. But what's exactly HOMO/LUMO? I know HOMO stands for highest occupied molecular orbital and LUMO stands for lowest unoccupied molecular orbital. But ...
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3answers
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Method to know the number of isomers of metal complexes

Whenever I try to find the number of geometrical isomers (including optical isomers) of coordination compound, I got confused, and mostly miss few isomers. Is there any standard method to know the ...
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1answer
43 views

Deviation from ideal gas law curves

So I was reading through my textbook on deviations from an ideal gas, and they had plotted a curve of experimental PV/nRT against the pressure. They talk a lot about why the volume is really smaller ...
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1answer
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What is Drago's rule? Does it really exist?

My textbooks states the Drago's rule in inorganic chemistry as follows: The more electronegative atom prefers the orbital having more p character, and lone-pairs or less electronegative elements ...
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What happens to electrolysis of dilute NaCl? [duplicate]

We know that pure water has approximately $10^{-7}$ ions of $\ce{H+}$ and $\ce{OH-}$ due to auto ionisation property but what after these ions? Will electrolysis of $\ce{H2O}$ stop and electrolysis of ...
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2answers
740 views

Difference between organic and inorganic chemistry [duplicate]

This question may seem vague at a first glance, and even lead to the thought: "come on, just go Google it!" But it's a real question because it does not make enough sense to me (even after Googling ...
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Why is a silent electric discharge used for the preparation of ozone from oxygen?

I learnt that ozone is prepared by passing oxygen through a 'silent' electric discharge. Can someone please explain what is meant by a 'silent' discharge here, and why that helps? I couldn't get a ...
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2answers
62 views

Why do things want to lower their energy? [closed]

Like if we consider a container of gas molecules as a system, Why does it want to lower its energy? I have read that always more spontaneous events are favored. So Gibb's Free energy should have a ...
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22 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 ...
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3answers
50 views

Ideal Gas equation and its Assumptions [duplicate]

The two assumptions are that the gases are points of mass that move, they have no volume and that there is no interaction between other molecules. But even the points of mass can collide with each ...
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1answer
35 views

Chirality and number of sterioisomers

I have recently read that the number of sterioisomers in a compound having n chiral centres is 2^n. (That is, if no meso form is present) The below question asks for the number of sterioisomers in ...
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2answers
966 views

What does thermal stability of compounds depend on?

Does it somehow depend upon the lattice energy of the compound? My textbook says that Lithium carbonate is not so stable to heat and forms more stable $\ce{Li2O}$ and $\ce{CO2}$. Could it depend on ...

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