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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Phosphate concentration

I have chemical analyses of groundwater samples (I got the analyses from a previous study) and I want to work with it in my master thesis. In these analyses, phosphate concentration is mentioned in ...
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How can copper(II) nitrate hexahydrate be synthesized in the laboratory as well as industrially?

I am researching the hexahydrate and found the same synthesis method being presented for both the anhydrous form and the trihydrate form. Chemistry of the Elements Second Edition, N. N. Greenwood ...
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Continuous series of inorganic hydrates (from mono- to deca-)

I'm doing some research for university and it has to do with crystals. I'm currently experimenting with $\ce{CuSO4 * 5 H2O}$. I know we refer to the formula as copper sulfate pentahydrate. And also, I'...
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Comparision of the Ionisation Energy Change of the alkali metals and noble gases?

Currently I compare the ionisation energys of the alkali metals: Li: $\pu{0.52 eV}$ Na: $\pu{0.50 eV}$ K: $\pu{0.42 eV}$ Where only a slight drop (appr. remain constant) occurs. This ionisation ...
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Separation of argon in Dewar's charcoal method

I was studying about the Dewar's charcoal method. It says in the book Modern Inorganic Chemistry by R. D. Madan on p. 1291 that at $\pu{-100 ^\circ C}$ Ar, Xe and Kr is adsorbed by the charcoal. ...
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4k views

Unpaired electrons from magnetic moment

A complex formulated as $\ce{Cs_x[NbCl6]}$ has spin-only magnetic moment $\mu_{s.o}$ of approximately 2 B.M. From this value calculate how many unpaired electrons are present. Spin-only magnetic ...
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1k views

Balanced Chemical Equations of the preparation of sodium peroxoborate

I know the chemical equation for the reaction of borax with sodium hydroxide and hydrogen peroxide $$\ce{Na_2[B_4O_5(OH)_4]\cdot6H_2O + 2NaOH + 4H_2O_2 ->2Na_2[B_2(O_2)_2(OH)_4]\cdot6H_2O + 3H_2O}...
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Correlation between electron counting and structure for metal borides

When it comes to metal borides, the electron counting and its correspondence to structure seems weird. For instance, $\ce{MgB2}$ and $\ce{AlB2}$ are isostructural, which is surprising. Further ...
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31 views

Hybrid thin films containing azobenzene with reversible photoresponsive behavior

I am going to prepare hybrid thin films containing azobenzene with reversible photoresponsive behavior. I have read about different combinations of inorganic layers such as layered double hydroxide (...
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252 views

Does soda-lime glass contain carbon?

Soda-lime glass is made by melting together soda (sodium carbonate), lime (calcium oxide), dolomite (calcium magnesium carbonate), silica (silicon dioxide), alumina (aluminum oxide), and small ...
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339 views

Acidified sodium sulfite in the reduction of iron(III) to iron(II)

Why does sodium sulfite have to be acidified in the reduction of $\ce{Fe^{3+}}$ to $\ce{Fe^{2+}}$? Does the acid act simply as a catalyst or is it necessary for the reduction process?
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Polarisation of a cation by an anion

Shriver and Atkins' Inorganic Chemistry (5th edition) explains amphotericity of the oxides of the heavier elements in Groups III, IV and V by high covalent character of the bonds made by the elements. ...
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159 views

Narrow range of pH for the formation of polyoxometalate clusters

The molybdate ion in aqueous solutions, speciates as clusters known as polyoxometalates (POMs) when it is acidified, but these clusters only aggregate in a very narrow pH range "polymeric range" in ...
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398 views

What is the effect of the surface area of an electrode on the emf of a cell?

I've read that a platinum electrode has no effect in a hydrogen fuel cell - why is this? Also, what is the effect of the surface area of an electrode such as zinc in a zinc copper cell?
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Why is it difficult to measure the pH of environmental water samples accurately (near 7)?

I've read in several places (edit: 1, 2, 3, 4, 5, 6, 7, 8. 9, 10, 11, 12) that there are many practical factors that make accurate pH measurements of roughly neutral environmental water samples more ...
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287 views

Are lustre and conductivity directly related?

In a question that I had asked before, Is chromium the shiniest metal?, I received the answer that silver was, in fact the most lustrous metal for visible wavelengths. At the same time, silver is also ...
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415 views

Copper (II) oxide during CuSO4 electrolysis

I was performing copper (II) sulfate electrolysis (graphite electrodes; 10V; 0,01A) today and I observed black precipitate falling from around cathode. I suppose it's copper(II) oxide. I couldn't find ...
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77 views

Chemically generating a high vacuum?

Suppose I fill a vacuum chamber with 99% oxygen, then pull a vacuum on it down to 10 pascal absolute. If I then vaporize aluminum (for vapor deposition), will the aluminum bind with the remaining ...
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237 views

Would an aqueous solution of Zn(2+) develop a positive charge if solid zinc was dipped into it?

Say you have a beaker containing $\pu{1M}$ solution of $\ce{ZnSO4}$. The solution will be electrically neutral because there will be an equal number of cations and anions. If you then put a zinc ...
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Synthesis of a tungsten carbene bromide from [CpW(CO)3]-

I'm currently working through past test and exam papers in order to prepare for my organometallic test at the end of the month, but unfortunately I've gotten stuck on the following question. Since I ...
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658 views

How does increasing ionic strength affect the pH of solution?

I'm having trouble interpreting the data for an experiment. With increasing ionic strength, I found lower solubility but also lower pH of the solution. What is the effect of the ionic strength on the ...
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100 views

Boiling Point trend

Why does group 13 and 14 show reverse the trend of boiling point? In other groups, boiling point increases down the group but here it decreases.
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385 views

Covalency in bonding across the periodic table

Bonding between main group elements is obviously almost entirely covalent and it is often easy to see these covalent bonds as 2c-2e bonds localised between two atoms. The bonding in borane, boron ...
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42 views

Nomenclature of This State?

I've read this in a book It says the state having three parallel spin is called triplet state . But as far as I know it is determined by "2S+1", from this it comes out to be 4 . Then how it is "...
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Purple rinse water

After forming a white substance while on the stove, I rinsed the Pyrex pot under tap water (from a well), whereupon the water in the pot turned purple. Why did this happen? Iron and sulfur are ...
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946 views

Job's Plot or Method Of Continuous Variations

I was wondering why in order to find the stoichiometry of a complex using Job's Plot, the two compounds must have the exact same molarity. What kind of effect would it have if molarities weren't the ...
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How does dissolving LDPE in wax work?

I was looking into machinable wax, and found it's based on dissolving LDPE into melted wax. While I understand the normal salt dissolving in water process, I'm not really sure how plastics can ...
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Hard and Soft Acid and Bases in terms of HOMO and LUMO

It has been given in a book and on Wikipedia that: hard bases have highest-occupied molecular orbitals (HOMO) of low energy, and hard acids have lowest-unoccupied molecular orbitals (LUMO) of high ...
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Electrolysis of molten sodium iodide

Electrodes: Zinc electrodes Electrolyte: molten sodium iodide I know that at the cathode, sodium metal will be formed because only sodium ions are present for reduction. At the anode, originally ...
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19F MAS NMR chemical shift tensor and the crystal structure

$\ce{^{19}F}$ MAS NMR is measured on fluorine-doped $\ce{TiO2}$. $\ce{F}$ is to substitute $\ce{O}$ and the crystal structure is anatase, which has a tetragonal crystal system with a space group $\ce{...
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Do all covalent nitrates on heating decompose to give NO2?

Being covalent we can conclude that they will on heating decompose completely, but will they give only NO2 and not any other oxide is the question. It is observed in PbNO3, AgNO3 and also LiNO3(the ...
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Looking for solubility kinetics of zinc chloride hydroxide monohydrate

$\ce{Zn5(OH)8Cl2.H2O}$ is a crystalline solid insoluble in water. Often used as nutritional supplement. Preparation and chemistry of zinc chloride hydroxide monohydrate is known. I am looking for some ...
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730 views

Why are gold-sulfur bonds so stable?

In my analytical chemistry book, I have seen that molecules' electrical conductance has been measured by putting sulfur-containing groups on them and using atomic force microscopy with a gold surface. ...
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90 views

Why can Bi not achieve its 4+ oxidation state?

Bi can reach its 3+ and 5+ oxidation state. Why not 4+? Can you use the inert pair effect here to explain this?
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808 views

Why is there no Pi-backbonding in BeCl2?

The $\ce{Cl}$ atoms in $\ce{BeCl2}$ donate a lone pair to the $\ce{Be}$ atom of another molecule so that Beryllium can complete its octet. What I don't understand is why don't the $\ce{Cl}$ atoms ...
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64 views

Why do reactions of sodium halides with sulfuric acid produce sodium hydrogen sulfate instead of sodium sulfate?

In the reaction of sodium halides with sulfuric acid, sodium hydrogen sulfate is produced \eqref{NaHSO4}. Why would this be produced instead of sodium sulfate \eqref{Na2SO4}? \begin{align} \ce{NaX + ...
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281 views

S-N bond IR vibrations

I am working on organosulfur compounds where i have S-N bonding, according to literature it might be having an ir vibration of 1100cm-1, could anyone confirm it with reference. (the complete bonding ...
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790 views

Does mercury (I) chloride react with HCl?

If solid $\ce{Hg2Cl2}$ is placed in concentrated $\ce{HCl}$, will it react? If so are the products $\ce{Hg2^2+}$, $\ce{H2}$, and $\ce{Cl2}$ ? $$\ce{Hg2Cl2(s) + 2HCl(aq) -> Hg2^2+ + 2Cl2(g) + H2(...
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Infrared Spectroscopy of Hexachlorocyclotriphosphazene

When assigning the IR spectrum of hexachlorocyclotriphosphazene there are two prominent peaks (one due to the nitrogen-phosphorus bond and the other due to the phosphorus-chlorine bond). There is ...
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347 views

Why does phosphine reduce HgCl2 to Hg but LiAlH4 / LiH reduces it to Hg2Cl2?

Why does phosphine reduce $\ce{HgCl_2}$ to $\ce{Hg}$ but $\ce{LiAlH4}$ or $\ce{LiH}$ reduces it to $\ce{Hg2Cl2}$ ? It seems phosphine has more reducing tendency.But why? Moreover can it be ...
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Is there a chemical reaction between tungsten carbide and acrylic?

My company machines acrylic (Poly(methyl methacrylate) $\ce{(C5O2H8)_n}$), and notices that tungsten carbide tools break down quickly compared to high-speed steel, even though carbide is harder and ...
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Why is ionisation energy of bismuth lower than lead?

Why is ionisation enthalpy of Bismuth less than that of Lead for it just comes after the latter in periodic table? First ionisation energy of bismuth is 703 kg/mol while that of lead is 715 kg/mol. I ...
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Reference request for properties of amorphous titanium carbide (a-TiC)

I assume through some side reaction I'm getting $\ce{TiC}$ in my $\ce{TiO2}$ samples after calcination and I need some basic information about the properties of amorphous $\ce{TiC}$. Is it ...
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918 views

Why are the melting points of Sb and Bi lower than that of As?

My book says it has something to do with the inert pair effect. And unlike As, Sb and Bi tend to form 3 covalent bonds rather than 5. I don't understand what's really going on here.
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How come ancient Egyptian ink didn't fade during thousands of years?

This ink's main ingredients were charcoal, honey and gum arabica. I understand charcoal is carbon and it would remain black for long time or forever just like coal. But gum arabica is organic and I ...
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O-N-O bond angles in oxides of nitrogen

If we look at the bond angles of O-N-O in figure (c), (D) and (F), there not too much change in bond angle. Even though they are notable. So my question is, Why do we observe very small change in ...
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183 views

Relative strength of metal hydrides as reducing agents

Question: Out of $CH_4, CaH_2, FeCl_2$ and $BeH_2$, which compound would produce the most strongly reducing aqueous solution? Thoughts: Out of the hydrides, I would say that $CaH_2$ stands a good ...
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42 views

Curious precipitate from substitution reaction

Two solutions were prepared. 'Solution A' being $\ce {Na2S4}$ prepared from aqueous $\ce {NaOH}$ and elemental sulfur, the mixture heated and additional sulfur added until sulfur remained as a ...
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Generating Precipitation Diagrams with CompuTherm Pandat

I am trying to develop precipitation diagrams for an Ag-Cu-Sn alloy to figure out the kinetics involved using the CompuTherm Pandat Software (Demo Version). The precipitation diagrams need the ...
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178 views

If both nitric acid and nitrate ion are stabilised through resonance, what makes the nitrate ion more stable in aqueous medium?

If both nitric acid and nitrate ion are stabilised through resonance, what makes the nitrate ion more stable in aqueous medium? Can the same argument be applied to nitrous acid and nitrite ion in ...

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