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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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Are homoatomic molecules like ozone, graphite, diamond considered as elements

While researching I have found two definitions for element. First, elements are pure substances that consist only one type of atoms. According to this O2, O3, Diamond and in short all allotropes are ...
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Mechanism of Zn + NaOH?

I was reading block chemistry in class, and I was taught by my chemistry professor this method of preparation of hydrogen: $\ce{Zn + NaOH -> Na2ZnO2 + H2}$ In this reaction, zinc reacts with ...
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What is less coordinating to metals? Triflates or hexafluorophosphates, and why?

I saw a reaction where $\ce{AgOTf}$ and $\ce{AgPF6}$ were used, but I am trying to discern the reactivity between the two silver salts. I read that triflates and hexafluorophosphates are both non-...
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Recommendation of syringe pumps

I need a syringe pump to adopt it to my chemical reactor for a specific process. I am looking for a precisely infusing pump. Can you advice me on this?
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Help with titration reactions

I have a few questions regarding some basic reactions. Our lab did an experiment where we first standardized NaOH with oxalic acid and then HCl with standardized NaOH. We noticed that there was a ...
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Hydrogen in Organometallic Chemistry

In the book, The Organic Chemistry of Nickel : Organonickel Complexes by PW Jolly, the reaction between sodium hexacarbonyldinickalte(-1) and ammonia produces hydride complex. Some possible ...
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How to identify whether given element is meta(-ate) ion or meta(-ite) ion? [duplicate]

Like why $\ce{PbO3-}$ is a meta plumbate anion because definition of meta(-ate) ion is that it has maximum oxidation state of Pb by using minimum oxygens. But in this case how oxidation state of Pb is ...
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Bicarbonate concentration in the RO permeate

I am facing a challenge since long ago, but have not been able to find a suitable solution for it. Please share your thoughts if you have the knowledge or experience in this area. I am running an RO ...
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Determing a monomer in a polymer [closed]

Do monomers can be determined by me? It depends on the location which I start. It is sketched at the picture.
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Nanolines (?) out of questionable neutralization reaction [closed]

I have added $\ce{Na2CO3}$ and excess $\ce{H3BO3}$ and I see what I presume are white nanolines floating to the top, including several air bubbles in midst of the reaction. Therefore, I conjecture ...
Number Basher's user avatar
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Brilliant fluorescent properties of Na2S(x) obtained from Na2SO3 or Na2S2O3

When $\ce{K2SO3}$ or $\ce{Na2SO3}$ is heated strongly by any method (in a flame, in an electric arc, on a metal plate in an induction heater), the resulting residue should be a mixture of $\ce{Na2SO4/...
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Short-circuiting an electrolytic cell with metal dendrites and observing interesting chaotic 1/f noise

While conducting home experiments on the electrolytic deposition of copper in a micro-gap (2-3 mm), under a microscope (x40) I observed interesting effects of short-circuiting by metal dendrites of ...
Nikita Danilov's user avatar
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Does copper(II) hydroxide dissolve in ammonia solution?

According to University of Oregon — Chemistry Interactive Demonstrations and Educational Resources — Copper-Ammonia Complex, the equilibrium constant for the formation of copper(II) hydroxide is ...
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What is the three-dimensional structure of H2CSF4?

Based on Bent’s rule and hybridization, which orbitals would be used to make the π-bond between carbon and sulfur, and in which plane would each of the atoms like? To make solving the question easier (...
gravity denier's user avatar
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How is indium tin oxide a n-type semiconductor?

I was reading about indium tin oxide (ITO) and that it is considered a n-type semiconductor. However, that doesn’t make sense to me. If just one In(III) is replaced by Sn(IV) then we would have an ...
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Reaction of RuCl3 and alkaline solution

Well, it is different from first-row d-block elements, ruthenium, for instance, seems to be unstable in alkaline solution. I have been trying to find the experiment for the reaction between RuCl3 with ...
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Do Electron-Withdrawing-Groups give an hypsochromic shift or a bathochromic one? and why?

I'm not familiar with this topic,but i know that bathochromic shifts occur when the energy gap between energy levels of the substituted molecule, are lower than the unsubstituted one;viceversa ...
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Why is my Ni or Fe cathode blackening and pores getting blocked during alkaline (6 M KOH) electrolysis?

I am conducting an electrolysis process for hydrogen $(\ce{H2})$ and oxygen $(\ce{O2})$ generation using a $\pu{6 M}$ $\ce{KOH}$ alkaline solution. During the process, I have observed that my cathode ...
Bhavik Modi's user avatar
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Mercury meniscus in plastic

Let's suppose you sample mercury in a polystyrene plastic test tube at 25 °C. Would it be expected that the meniscus of Hg is convex (upward curvature) ? I assume that the only possible adhesion ...
Tom's user avatar
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What is the chemical reaction between nitric acid and acetic acid?

Is there a chemical reaction between nitric acid and acetic acid? The main reason I am asking this question because my lab throws away residues of both of these two ($\pu{1 M}$ concentration each) in ...
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explanation for density order in group 2 elements

In Group 1 (alkali metals), density generally increases as you move down the group. However, in Group 2 (alkaline earth metals), the density might decrease initially and then increase. So when we ...
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Does oxygen bind to Fe2+ or Fe3+ in heme of hemoglobin? And why?

My biochemistry teacher said that only $\ce{Fe^2+}$ in hemoglobin can bind to oxygen, while $\ce{Fe^3+}$ cannot. I researched this and found an article that states that it is $\ce{Fe^3+}$ that binds ...
BugsBunny's user avatar
2 votes
1 answer
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Blue colour while hexacyanoferrate(II) reacts with Hg2+

From this article, the author noticed that when [Fe(CN)6]4- reacts with Hg2+ in a 1:2 molar ratio, a white precipitate formed, then turn blue color. What is the chemical that is responsible for this ...
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Could the presence of Alkali Metals in recycled hydrated cement paste (HCP) affect the quality of the clinker?

"Electric recycling of Portland cement at scale" is an article that describes a new process for producing cement from recycled concrete and steel scrap. This process could significantly ...
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3 votes
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Fluorination of PCl5 in polar organic solvent

The species formed on fluorination of phosphorus pentachloride in a polar organic solve are While researching this question, I managed to find this in the book: N. N. Greenwood and A. Earnshaw, Book: ...
bromocresol's user avatar
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1 answer
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Are there any 2D materials whose bonding can be best described as metallic rather than covalent?

Wikipedia's The nature of metallic bonding; In 2D says: Graphene is an example of two-dimensional metallic bonding. Its metallic bonds are similar to aromatic bonding in benzene, naphthalene, ...
uhoh's user avatar
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Would it be possible to form dense metal using a sol gel technique?

I was trying reduce some silver salt AgNO3 into elemental metal by thermal reduction I mixed it with citric acid and formed a solution and poured it into a circular cap (makeshift mould) and what I ...
assasinchop7's user avatar
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1 answer
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Standardizing alkaline ferricyanide solution [closed]

The ferricyanide method of determining reducing sugars is simple but I need clarity on time of addition of potassium iodide solution. I am unable to observe change in color from yellow to blue. I even ...
aj_23's user avatar
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If LiF is ionic in nature, why can't it dissolve in water?

LiF is prominently ionic compound. I also know polar substances can be dissolved in water as "like dissolves like". Why is then LiF only weakly soluble, in comparison with LiCl, or LiBr, ...
Maths lover's user avatar
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Is double excitation of nitrogen possible, and would it be able to use it as a central atom in a coordination complex?

I’m 17 and in my 2nd year of high-school (we have it a tad different here in the Czech Republic) and am interested in theoretical chemistry so that’s the explanation of the nature of my question. So, ...
Prokop Hoza's user avatar
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3 answers
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Why there is no P−O−Cl bond in phosphoryl chloride?

Why is the structure of $\ce{POCl3}$ not like the left? I know the elements in period 3 or higher don’t have to follow the octet rule, but the left structure doesn’t seem to have any problems:
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Why exactly the stability of peroxides increase on going down the group [duplicate]

Why the stability of peroxides and superoxides increase down the group 1 and whereas the stability of oxides decrease down the group. The reason for one of them in my textbook is given as lattice ...
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Restriction of back bonding in tris(dimethylamino)borane

J.D. Lee Concise Inorganic Chemistry [3, p. 78] mentions that The bond length order of the B-N bond in the following compounds is $\ce{B(NR2)3}$ > $\ce{HB(NR2)2}$ > $\ce{H2B(NR2)}$ and the ...
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Confusion in comparing contribution of resonance structures in Hydrazoic acid

Given below is the resonance hybrid of $\ce{HN3}$(Hydrazoic acid) And these are the resonance structures below: If the second resonance structure had contributed more, then the two bond lengths ...
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Which alloy forms the thinnest sulfide surface passivation layer?

Metal sulfides seem to often form thick layers on alloy surfaces exposed to molten $\ce{S}$. Are there alloy surfaces capable of passivation with $\ce{S}$ before the layer thickness reaches $\pu{1 nm}$...
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Melting Point Order of Benzene Derivatives

Q)Compare the melting points of the following? o-Hydroxybenzaldehyde o-Methoxybenzaldehyde p-Hydroxybenzaldehyde p-Methoxybenzaldehyde My attempt: Intermolecular H-bonding increases melting point ...
Chetan's user avatar
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1 answer
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Ionic radii of the first row d-block elements

From these figures: I could not think of any explanation for the question why Cr2+ radius is larger than that of V2+ while the atomic radius of chromium is smaller than vanadium.
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Percentage Yield

For the above MCQ question, I took the equation to be $$\ce{CaC2 + 2H2O -> C2H2 + Ca(OH)2}$$ I then calculated the moles of $\ce{CaC2}$ as 0.7273 moles, which has a 1:1 molar ratio to $\ce{C2H2}$, ...
Jane902's user avatar
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2 answers
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What's the best way to recover silver from industrial and medical x-ray film? [closed]

I washed industrial and medical x-ray film with lye and tap water. Can I add bleach to draw the silver out of the lye or would I just add salt water to get AgCl, then siphon off the excess water and ...
Bryan's user avatar
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7 votes
0 answers
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Type of British porcelain invented around 1917-1918

Being subscribed already for 30 years on Scientific American, I recently downloaded the whole archive, and I am now going through 1914-1918. In the 26 January 1918 issue, on page 95, there is a small ...
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How does a conc. electrolyte solution extract water from a organic phase like diethyl ether or ethyl acetate?

In organic chemistry, often, during the last steps of a workup we use concentrated brine solution (NaCl) to "extract" the water from the organic layer, especially when we have an organic ...
TheBorcanu's user avatar
8 votes
1 answer
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Melting point of sulfur

The melting point (m.p.) of rhombic sulfur is 385.8 K while the m.p. for monoclinic sulfur is 392 K. Also, the transition temperature of rhombic to monoclinic sulfur is 369 K. Now, consider heating ...
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Determining an unknown E° from two similar half ox/redox reactions

Use the oxidation half-cell and reduction half-cell, $\ce{Cr^3+/Cr^2+} = \pu{0.424 V}$ and $\ce{Cr^3+/Cr2O7^2-} = \pu{1.32 V}$, to determine the $E^\circ$ for $\ce{Cr2O7^2-/Cr^2+}$: a. $\pu{-1.75 V}$ ...
Robertsson's user avatar
1 vote
1 answer
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Is arsenic pentasulfide soluble in 50% nitric acid or in hot dilute nitric acid?

I am aware that arsenic pentasulfide is soluble in hot concentrated nitric acid giving arsenic acid ($\ce{H3AsO4}$) + nitric oxide + sulfur, but am not sure whether it is soluble in 50% nitric acid or ...
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2 votes
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Salts solubility and speciation calculations using PHREEQC

I am collecting data from literature for CO2 solubility in aqueous solutions. These are usually synthetic brines and are reported as molalities or wt% of salts or salt mixtures (I have NaCl, KCl, ...
Abdeldjalil Latrach's user avatar
3 votes
0 answers
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Why is a C=C weaker than a C=N and even weaker than a C=O when C-C is stronger than C-N and C-O?

Why is a C=C bond weaker than a C=N and even weaker than C=O ? In terms of orbital overlap it doesn't make sense, since there is a difference in energy between the orbitals which lower the interaction ...
TheBorcanu's user avatar
1 vote
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Paramagnetism in coordination complexes

A complex is classified as paramagnetic or diamagnetic based on the electronic configuration of the central atom/ion. Should the properties (para/dia) of surrounding ligands also affect the nature of ...
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How does Hexaaquanickel(II) show color

I have studied that there must be unpaired electrons in $t_2g$ orbitals so that they can make transition to the eg orbital by absorbing energy from light. But in $\ce{[Ni(H2O)6]^2+}$ $\ce{Ni^2+}$ has $...
yyzr's user avatar
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1 answer
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Why is phosphoric acid a weak acid?

What is the reason for the phosphoric acid $\ce{H3PO4}$ being a weak acid despite having a structure similar to that of sulfuric acid $\ce{H2SO4}?$ I found some sources claiming that the resonance of ...
Kampann's user avatar
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Are there ionic compounds that dissolve in water but do not dissasociate into their ions?

I would assume such a molecule would be possible because polar ionic compounds have a partial charge that can help them dissolve in water yet not disassociate into their ion parts, but I am not sure.
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