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 is cupric oxide more basic than cuprous oxide?

I have learnt earlier that metal oxides with higher metal oxidation states are more acidic than those with less oxidation states, but copper disobeys this rule. Why?
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Hydrogen Peroxide Heat of Dilution

Based on some data here, I am getting the heat of dilution of 100% $\ce{H2O2}$ as approx. 1100 cal/mole. That's about 4.6 kJ/mol if I did my math right. Is this a correct value? Seems too low to ...
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What are the disadvantages of using the InChI format?

What are the disadvantages (if any) in producing and using the InChI format of chemical compound representation in chemoinformatics? Are there any particular problem one can face when using InChI?
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Predicting a route to use chloride as a reducing agent for titanium dioxide under UV

In my lab we are deadlocked on a seemingly simple problem. We would like to find some reaction where $\ce{Cl-}$ can be used as a reducing agent on $\ce{TiO2}$ in a UV photosynthesis. We ideally want ...
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Ligand Field Theory with non-identical ligands?

Lots of undergraduate inorganic textbooks deal with complexes with $O_h$ or $T_d$ symmetry. So, if ligands are not same(like $\ce{[Ni(NH_3)_4(H_2O)_2]^{2+}}$), what methods are used to interpret their ...
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847 views

Methanol adducts with CaCl2

Methanol forms adducts with $\ce{CaCl2}$ but I am not finding much information about the nature of these adducts & their stability. Are these solid adducts? Crystalline? Is the reaction ...
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What reactions does this steel cold-bluing solution undergo?

Bluing steel generally refers to the process of forming a protective layer of $\ce{Fe_3O_4}$ ("black iron oxide") that prevents normal rust from forming. The chemistry behind the traditional ...
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533 views

Why are certain reflections forbidden in body centered cubic and face centered cubic structures?

I know that for body centered cubic structures the allowed reflections only happen if h+k+l is even and reflections are forbidden is h+k+l is odd, and for basic face centered cubic structures (...
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Lithium chloride is soluble in pyridine while other lithium halides are not. Why?

Lithium chloride is soluble in pyridine while other lithium halides are not. Why? I know that lithium chloride is deliquescent like magnesium chloride. Lithium halides are covalent and thus are ...
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139 views

Could any constituent of normal human urine produce a false positive in a Kastle-Meyer test for presence of blood?

From my understanding, one forensic test for the presence of traces of blood at a crime scene is (or was) the Kastle-Meyer test. Doing some research, I understand that in the test, hemoglobin reacts ...
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192 views

Why do isomeric bis-ethylenediamine cobalt complexes react differently?

A compound $\ce{Co(en)2(NO2)2Cl}$ has been prepared in a number of isomeric forms.One form undergoes no reaction with $\ce{AgNO3}$ or $\ce{(en)}$ and is optically inactive. A second form reacts with $...
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Relative etch rates of nitric acid on metals and oxides

I am trying to either find or calculate the etch rate of nitric acid ($\ce{HNO3}$) for various different metals and oxides. The ones I am interested in are titanium ($\ce{Ti}$), zirconium ($\ce{Zr}$), ...
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870 views

What type of bonding is present in lithium tetrahydridoaluminate?

I can tell that the negative ion has one bond which is a co-ordinate/dative covalent bond. However, overall, would you say that lithium tetrahydridoaluminate (lithium aluminium hydride) is ionic? If ...
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165 views

Is it possible to react Rb + Al2O3?

I am wondering if the Rubidium ($\ce{Rb}$) in gas form can react naturally with Sapphire crystal ($\ce{Al2O3}$)? The temperature is $500\ \mathrm{K}$ and the pressure is around $1\ \mathrm{Pa}$ to $10\...
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Electronegativity comparison of group 13 elements

Why is electronegativity of indium slightly greater than gallium?
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Products of silicate synthesis

I'm attempting to make a hard refractory cement to apply over kiln brick made of sodium silicate and Perlite. This creates a very good kiln brick, however they are susceptible to abrasion. I've been ...
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Iron (II) dioxygen reaction mechanism?

Ok so I'm confused about the mechanism for this process: Now the idea here is that iron first becomes oxidised to Fe(III) by placing an electron in the antibonding orbital of dioxygen. This is ...
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121 views

Strength and magnetic charge of KNO3

A question asks for physical properties of potassium nitrate, and specifically asks for "magnetic charge" and "strength" (that is how it is phrased). I have properties such as white in color, vitreous,...
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271 views

Spectral reflectance identification of types of iron rust

Based on the Wikipedia page about rust, there are red and green types of rust that occur on iron. Red rust is the reaction with oxygen and water and the green with chlorine (in oxygen poor ...
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Photoelectrochemical (PEC) water splitting

I'm starting to prepare for my research project on photoelectrochemical (PEC) splitting of water into H and O using (F doped) titanium dioxide as the photoanode. I've been unsuccessfully searching in ...
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1answer
3k views

Iodine clock reaction

I have been investigating the iodine-clock reaction for my chemistry project. I have done a great deal of research on the titration of iodate ions, iodide ions and sodium thiosulfate using HCl. But, I ...
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1answer
524 views

Why can't oxalate ion donate two pairs of electrons from the two double-bonded oxygen atoms

So, I read that an oxalate ion is a bidentate ligand but since I saw that it has 4 oxygen atoms I was confused as to why it isn't a tetradentate ligand instead. I searched it on Google and found this:...
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Structure and oxidation state of bridging complexes

I am confused about the structure of bridging complexes with the bridging ligands as $\ce{OH-}$ or $\ce{NH2-}.$ Aren't they both monodentate ligands? And if they form a simple coordinate bond, then ...
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Is sodium acrylate soluble in ethanol?

I am trying to make sodium acrylate by neutralizing acrylic acid with sodium hydroxide. I further want to photo-pattern it, which requires the addition of photoinitiator to sodium acrylate. The ...
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52 views

Mixing cobalt(III) hydroxide and thallium(III) hydroxide

A simple question on solutions is driving me crazy. At this point, I think the textbook's wrong. Here's the question: A saturated solution of cobalt(III) hydroxide $(K_\mathrm{sp} = \pu{1.6e-44})$ ...
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1answer
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Cheap but efficient disinfectant / biocide for home lab

EDIT I am forced to reword my question about a chemical mixing ratio. I have seen in Wikipedia that peroxide ($\ce{H2O2}$) and Acetic Acid can be mixed to Peracetic acid - this is an equilibrium. I ...
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Amount of benzoic acid required to alter pH of a NaOH-solution

I am trying to do a practice problem but I can't figure it out: How many grams of benzoic acid needs to be added to 0.10 l of a NaOH-solution with a concentration of 1.0 mM to reduce the pH of said ...
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How can we conduct reactions for insoluble materials?

I am working on metal organic polydehra topic to synthesize new metal-organic cages or other based frameworks. I want to conduct postsynthetic modification for one cage, but the solubility is very ...
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Why do electrocatalysts based on polyoxometalates and carbon materials have a weaker activity/performance in acidic media?

I am testing now some doped N and S doped carbon nanomaterials alone and immobilized in POM for the purpose of developing a nanocomposite that can serve as an electrocatalyst for energy-related ...
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Reactivity of Ni Vs. Pd - available oxidation states

I'm hoping someone can help me tighten up my understanding of the origins of the differences between Ni and Pd catalysis. I understand that Ni has higher charge density and this is the reason for it'...
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Spin state change during crystallisation for [NiCl2(PPh3)2]

$\ce{NiCl2(PPh3)2}$ is a complex that is borderline between tetrahedral(high spin) and square planar(no unpaired electron, high splitting parameter) because $\ce{Cl-}$ is a weak field ligand and $\ce{...
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Why does sp hybridised orbital have more directional character than p orbital?

It states so in my textbook. But since s orbital is non directional, shouldn't sp hybridized orbital be less directional in character than p orbital?
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Shortcut method to find atomic term symbols ignoring the spin orbit coupling

Is there any shortcut method by which we can find the atomic term symbols ignoring the spin-orbit coupling, i.e. ignoring the values of J. For instance, when writing the d-d transitions for any ...
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What does the dissociative mechanism for cis/trans interconversion of [Mo(CO)4(PPh3)2] look like?

All I can find in the literature is that the cis→trans interconversion proceeds via dissociation of one of the PPh3 ligands resulting in a square-pyramidal Cs intermediate, with the remaining PPh3 in ...
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59 views

How does a Pt and reference electrode measure the cell potential in a potentiometric titration?

I'm trying to perform a potentiometric titration to determine the redox potential of a $\ce{Fe^3+|Fe^2+}$ couple. To do this, I am using an $\ce{Ag|AgCl}$ electrode connected to an inert $\ce{Pt}$ ...
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Is there a stable and non-toxic hydro-nitrogen-oxygen compound that's liquid in room temperature?

Is there a stable (i.e. does not turn into other substance when stored in a bottle exposed to the elements or explode/combust spontaneously or under mechanical impact) compound that contains just $\...
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284 views

OF2 vs O2F2 oxidising strength

My teacher said that OF2 is the third most powerful oxidising agent after F2 and atomic O, but I think O2F2 should be even more oxidising, since it less stable than OF2. I just read on quora that O2F2 ...
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Can hexavalent chromium be created by exposure of chromium alloys to air at room temperature?

I believe that Cr on its own (as in chrome coating) oxidizes as Cr(III) when exposed to air, and similarly I think that it is the same for Cr as a component of stainless steel. Is it always the case ...
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Acidity of polysulfanes

In a chemistry olympiad I had this morning, there was a question on the acidity of polysulfanes. Specifically, it asked candidates to explain the increasing acidity of polysulfanes as the number of ...
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Fluoride anion as a strong field ligand

In the case of $\ce{[Fe(H_2O)_6]^{3+}}$ there are $5$ unpaired electrons as water acts as a weak field ligand. But instead of flouride acting as a weak field ion in the $\ce{[MnF_6]^4-}$ , why does it ...
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CO2 is attracted to what?

People are using filters to remove $\ce{CO2}$ from the air. What are this filters made of and are there any other substances that attract $\ce{CO2}$? How is $\ce{CO2}$ absorbed or attracted to these ...
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Gallium - Practical use to remove aluminium

Would gallium pass through aluminium into steel? The situation is two joined pieces of metal. Gallium could be applied to the aluminium to degrade it, for mechanical removal, but would it pass ...
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Building a Salophen-Complex with Iron(III) and Cyanate

I prepared the compound in (1). Now I want to prepare the complex with a cyanate ligand (2). Is it possible to prepare Fe(OCN)3 or should I form the chloro-complex first and then change the Ligand? ...
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Molecular orbital diagram for terminal metal-oxo complex with dative bonds

I am interested in terminal metal-oxo complexes and their electronic structure, specifically those with coordination numbers of 6, including the oxo ligand. I know that Fe(IV)-oxo complexes tend to ...
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Why are signals broadened in polarography?

In the attached polarogram from Heyvrovsky's 1959 Nobel lecture, transitions from one plateau to the next are smoothened out rather than sharp and abrupt. Why is that? I understand that currents were ...
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Why are bicarbonates of alkaline earth metals stable only in aqueous solution?

Numerous internet sources (1, 2, 3, etc.) state this fact, including a Wiley publication "Alkaline Earth Metals: Inorganic Chemistry - William S. Rees Jr" (DOI: 10.1002/0470862106.ia005) on page 9: ...
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Results of mixing HSbF6 and O2F2

I'm an amateur writer and one of the topics I deal with is what happens when a slightly-mad scientist and engineer is given an opportunity to work with full-on “magic.” So there are situations where ...
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Why are the terminal Hydrogen bonds in diborane lost during alkylation?

Considering the fact that the bridge h bonds in diborane are weaker according to the answer to the following question..>>.Why are bridge bonds in diborane longer than the terminal H bonds? Why is ...
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Alternatives to EDTA for calcium ion chelation

Are there any $\ce{Ca^2+}$ chelating agents (other than EDTA) that are as good as EDTA in terms of binding calcium ions and effective in a pH range of $5$ to $9$?
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What is the significance of effective nuclear charge of an ion

After teaching rules of Slater, our teacher gave some examples. Some of them were to calculate effective nuclear charge on an electron, but some of them involved calculating Z* of atoms and ions. For ...