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 Beryllium intensely hydrated if its reduction potential is so low?

I just read these two facts and they don't match up. The reduction potential of Be is much less than rest in the group. This indicates that beryllium is much less electropositive than the others and ...
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Hybridization theory (orbitals used in different hybridizations)

Why is $d_{x²-y²}$ orbital used in $sp^3d$ (square pyramidal geometry) while $d_{z^2}$ orbital in $sp^3d$ (trigonal bipyramidal geometry)? I came across this information while reading J.D.Lee Concise ...
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Can Potassium Carbonate be used to reduce Calcium hardness in water

I have a solution of KCl 20g/l (2%) and 500mg/l Ca, To reduce the hardness, Na2CO3 is normally used, but can I use K2CO3 instead?
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Methods to quantify lead(II) concentration in water on the ppm/ppb level

While there are several ways to quantify metal concentrations in water, a lot of them are only specific to select metals. For example, there is the orthophenanthroline method for quantification of Fe(...
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Chemical equilibrum [closed]

An equimolecular mixture of NH3 and O2 is contained in a container. After the oxidation reaction took place to obtain NO, the equilibrium is established: 4NH3 + 5O2 ⇌ 4NO + 6H2O + Q It is found that ...
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Can o-phenanthroline be used as a complexing agent for lead(II)?

I’ve been trying to find a method to perform a spectrophotometric analysis to determine lead concentration (on the ppm level). This would require some chelator capable of forming a coloured complex ...
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25.00 mL of a 0.150 M HCN solution is titrated with 0.100 M KOH solution [closed]

25.00 mL of a 0.150 M HCN solution is titrated with 0.100 M KOH solution. The Ka of HCN is 4.0 x 10^-10 a)What is the volume of KOH needed to reach the equivalence point? b)What is the initial pH? ...
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Formation constant of Eriochrome Black T Complexed with Pb (II)

What is Eriochrome black t’s formation constant when complexed with Pb (II)? If Eriochrome was placed in solution with a metal ion complexed to NH3, would Eriochrome likely replace NH3 via ligand ...
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stability of cabergoline /dostinex [closed]

How stable is the following molecule, cabergoline? I'm wondering about the potency of expired medication (Dostinex) in which it is the active ingredient.
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Arsenic bound proteins confirmatory test

I want to confirm the presence of arsenic in some protein samples, apart from the marsh test can I use the following method?-- Arsenic is present as arsenic (III) ion in the samples. Hydrogen sulfide ...
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Is it possible to remove dissolved chlorine from water? [closed]

So recently I was trying to disinfect water by adding bleach to it but accidently I added too much of bleaching powder. So now the water has a very pungent odour. Is it somehow possible to decrease ...
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Scale to be considered for comparing electronegativities of nitrogen and chlorine

The Pauling scale gives the $\chi$ values of $\ce{N}$ and $\ce{Cl}$ to be $3.04$ and $3.16,$ respectively, but the Allen scale gives the $\chi$ values of $\ce{N}$ and $\ce{Cl}$ to be $3.066$ and $2....
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Chemicals that form coloured complexes with Pb2+

I’m currently conducting a photo-spectrometric analysis of lead concentration in water and was looking into using Eriochrome Black t as an indicator for Pb2+ (due to the complex forming a reddish ...
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Writing half equation confusion

The following is the answer for a question that I am doing: Reduction: $\ce{X^2+(aq) + 2 e- -> X(s)}$ Can I write $\ce{X + 2 e- -> X^2-}?$ Why can't I start with $\ce{X}$ instead of $\ce{X^2+...
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How to properly model a mechanochemical reaction of barium titanate and copper(II) complexes?

I would like to understand, in terms of chemical kinetics, how I could equate the reaction rate between $\ce{BaTiO3}$ and copper(II) complexes under ultrasound effect. Examples in literature would be ...
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Projection Operator Method on Cl4+

I am not quite sure how to start on 1b.We are given 2 diagrams but I am not sure how to use the second one in the question, or if we have to. I got the point group for Cl4+ to be (D2h) however, but ...
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Determining direction of equilibrium

I am having a lot of trouble with this question. We have to determine if (K) is greater or less than 1. I at first thought the equilibrium would favor the right side because this could have to do with ...
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Importance of concentration of gold in gold parting

I read following lines about gold parting: Gold is not attacked by $\ce{H2SO4}$ or $\ce{HNO3}$, but copper and silver dissolve in them, when concentration of gold is less than $30\%$. If however, ...
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How does trimethylgermane feature in this reaction scheme?

I think this reaction forms some monomer of styrene and trimethylgermane but I can't seem to figure out what the intermediates are or the mechanism in which how this is formed. I know that the ...
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Why dosen't No2 form according to the octet rule?

Supposedly every atom that is in the second period of the periodic table has to obey the octet rule, this means that they have to be surrounded by 8 electrons (or so I was taught). Studying resonance ...
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Lewis acidity order of nitrogen family halides

In chlorides of nitrogen family why does lewis acidity order decrease down the group. We know electronegativity decreases down the group therefore partial -ve character of central atom should ...
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Identifying Copper Purity At Home [closed]

Are there any ways to figure out if the copper foil and mesh I have are pure, as-close-to 100% copper as possible (and as advertised)?
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Symmetries and degeneracies of the s,p, and d orbitals

Consider the molecular AB_8 (complex with central atom A and 8 B ligands (coordination number 8), for which I determined the point group D_4d) and determine the symmetries and degeneracies of the s, p,...
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Grouping of symmetry classes in chemistry character tables

In the C3v point group, it lists three sigma Vs together in one column (class), and it doesn't list the cVs separately. Consequently there are three irreducible representations. In the C2v point ...
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Organic chemistry [closed]

Could someone tell me what happens when a compound having a benzene ring reacts with a mixture of NaOH/HCHO? What reaction and mechanism does this follow?
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What is the characterstics of additives that it must posses to make any mixture hypergolic?

This is about hypergolicity of rocket propellant.Turpentine gave hard-start with RFNA and WFNA but excellent with mixed acid(mixture of HNO3 & H2SO4).Similarly,Furfuryl alcohol & WFNA(also ...
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Is [Co(H2O)6]3+ a low spin or high spin complex?

I had been taught that although $\ce{H2O}$ is normally a weak field ligand for 3d transition elements, $\ce{Co^{3+}}$ is an exception and forms a low spin complex with conventionally W.F.L. like $\ce{...
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What pH results from the reaction of 0,004 moles of HCl and 0,0033 moles of AgNO3? [closed]

I know that this reaction takes place: HCl+AgNo3->AgCl+HNO3 And that all the AgNO3 is consumed and that there are 0,0007 moles of HCl left. But I don't know how to continue and get the pH. Can ...
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Why is phosphorus trifluoride the strongest Lewis acid among the phosphorus trihalides?

I had read that for the trihalides of boron, boron trifluoride is the weakest Lewis acid due to backbonding. The order I had seen was - $\ce{BI3 > BBr3 > BCl3 > BF3}\$ $$\ce{}$ $- order of ...
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Effect of optical isomerism on colour of transition metal complexes

I know that different stereoisomers of a given transition metal complex (cis- and trans- forms) have different colours. But do different optical isomers (non-superimposable mirror images) have ...
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Separating lanthanides using ion-exchange method

Following statements are on Separation of rare earth metals (lanthanides) via in-exchange method The tripositive ions are strongly sorbed by cation exchange resin: $\ce{La^{3+}}$, the largest is ...
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Is a super saturated solution at equilibrium? [closed]

Is a supersaturated solution at equilibrium? I know that a saturated solution is at equilibrium because of the constant rates of formation and ionization. Does this idea apply to supersaturated ...
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Cation-anion radius ratio of manganese difluoride

How to determine the cation-anion radius ratio for $\ce{MnF2}?$ I tried to calculate the $r_\mathrm{c}/r_\mathrm{a}$ ratio using the relationships: $$2r_\mathrm{c} = c$$ and $$(2r_\mathrm{c} + 4r_\...
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Use of Spiegeleisen in manufacture of steel

I recently read the following statements related to Manufacture of steel via Bessemer Process: When no more $\ce{CO}$ is produced (i.e. blue flame disappears) a calculated amount of Spiegeleisen (...
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Why doesn't diamond conduct electricity but silicon does?

Diamond's structure is a large network covalent crystal, where there are strong covalent bonds between neighboring tetrahedral carbon atoms. The explanation I was given was: The electrons are held ...
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Does tris(ethylenediamine)iron(III) exhibit optical isomerism? [closed]

I'm studying 12th. In my book they mentioned that $\ce{[Co(en)3]^3+}$ exhibits optical isomerism. But in that same book, there is a question Which of this doesn't exhibit isomerism? and the ...
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Comparing bond angle [duplicate]

How can I compare bond angle between hydrogen sulfide, $\ce{H2S}$, and sulfur dioxide, $\ce{SO2}$? In $\ce{H2S}$ there are 2 lone pairs whereas in $\ce{SO2}$ there is 1 lone pair which means bond ...
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Comparison of lattice energy

Which compound has largest amount of lattice energy among $\ce{AlF3}$ and $\ce{AlN}$. I think it should be $\ce{AlF3}$ because lattice energy in inversely proportional to radius and size of flourine ...
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Why Molecular Solids can be treated as Monoatomic in Reactions

I'm trying to figure out what is the precise rule for the formula of elemental substances in reactions. I'm afraid I can't word the question properly, so I'll try to give some examples. 1)Oxidation ...
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Why does electrode potential depend upon enthalpy of hydration and sublimation?

It's given in text that "Electrode potential among other things depends upon: enthalpy of sublimation,ionization enthalpy and hydration enthalpy." I could understand why it would depend upon ...
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Comparing Electron affinity and electron gain enthalpy at 0 K

In my book it is given that first electron gain enthalpy is greater than second for elements. Should we compare the magnitudes in such cases or the actual numbers with signs? Does the same comparision ...
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Formulation chemistry. Can somebody suggest me an introductory book on this subject? [duplicate]

I am looking for an introductory book on formulation chemistry: the book should cover physico-chemical aspects in designing a formulation and also, if possible, the chemometric basic concepts used in ...
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What happens if the filter paper in vacuum filtration is BIGGER than the buchner funnel diameter? [closed]

I’m wondering what would happen if the filter paper in a vacuum filtration process is bigger than the buchner funnel diameter? I mean would some differences occurs? Or would the whole experiment ...
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Which is the best kind of filter papers to use to extract silicon nanoparticles after acid wash, hydeophobic or hydrophilic?

I'm looking for filter papers to extract silicon nanoparticles after acid etching. I found that much of my material is get wasted with my Whatman Grade 4 filter paper. I am thinking to use membrane ...
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Calculate the lattice energy of ammonium carbonate

The lattice energy is a measure of the stability of a compound and I need this data for the ammonium carbonate ($\ce{(NH4)2CO3}$) but I don't know how to calculate and I can't find it anywhere. I know ...
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What is the trend of thermal stability of group 1 oxides?

The thermal stability of most compounds of Group 1 elememts (hydroxides, carbonates, nitrates) increases down the group due to decrement in charge density of the cation. Now, according to one of my ...
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What does HClO2 aqueous solution decompose to in an open environment? [closed]

I looked up the decompositions of diluted $\ce{HClO2}$ aqueous solution (used in a disinfectant) to know if it is safe to use on some substances, such as metal, wood, leather or skin. However, the ...
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Molecular mechanics of current flow in electrolysis of alkaline water - effect of electrolyte concentration?

I’m confused about the how to explain the effect of electrolyte concentration (eg. NaOH) on the magnitude of the current when an external voltage is applied. I want a precise explanation and not a ...
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1answer
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How can ionic bonding in lanthanides occur without valence orbitals available for overlap?

I've recently been taught that the 4f orbitals in lanthanides are "core-like", supposedly meaning they have radius smaller than the 4d orbitals, therefore they are not available on the outside of the ...
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Chemical treatment for softening caliche soil layers

Caliche is a formation found in some desert areas. It is a form of calcium carbonate that is highly resistant to being dissolved by water. So much so, that it can form an impenetrable layer ...

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