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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Should I write formula for oxalate or oxalic acid while balancing a redox reaction using the ion-electron method?

Problem: Balance the following reaction using the ion-electron method: $$\ce{H2C2O4 + KMnO4 + H2SO4 -> CO2 + MnSO4 + K2SO4 + H2O}$$ My book's solution: Oxidation half-reaction: $$\ce{C2O4^2- -> ...
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Why did my book write S2- if hydrogen sulfide isn't ionic?

Problem: Balance the following reaction using the ion-electron method: $$\ce{KMnO4 + H2SO4 + H2S -> MnSO4 + S + K2SO4 +H2O}$$ My book's solution: Oxidation half-reaction: $$\ce{S^{2-}->S + 2e^{-}...
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Is potassium permanganate an oxidizing agent or is the permanganate ion the oxidizing agent?

I have seen both potassium permanganate and the permanganate ion being called the oxidizing agent. Isn't it more appropriate, however, to call the permanganate ion the oxidizing agent only as the ...
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How to theoretically determine if a hydrate of a salt precipitates out of solution

In a solid-liquid extraction simulation process, there are multiple salts that precipitate in the solution. But how do I determine if these salts are hydrates or not? To give an example: $$\ce{Ca3(PO4)...
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Relative stability of $\ce{V^2+}$ and $\ce{V^3+}$ and their Standard Electrode Potential

My book - NCERT Chemistry for Class XII -Page 218 Contains the following paragraph: Initially they mention that the Low value for Standard Electrode Potential of $\ce{Sc^3+/Sc^2+}$ is due to the ...
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Why isn't lead tetroxide stable?

I have heated lead(II) oxide at about 450 °C and it changed to lead(II,IV) oxide, but as soon as I took it out from hot plate, it changed to $\ce{PbO}$ again. Why does it happen? Is there a better way ...
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Why does density decrease when pressure is increased on an NaCl type lattice?

I was told that the effect of pressure on an NaCl type structure would make the atoms come closer and therefore change the type to CsCl type making Z (no of atoms per unit cell) go down, hence density ...
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Has tellurium(II) iodide been properly characterized ever?

According to Wikipedia, tellurium tetraiodide decomposes on heating: $$\ce{TeI4 ->[\Delta] TeI2 + I2}$$ However, the reaction is somewhat wrong as according to this 2008 paper: Solid tellurium ...
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How to dissolve cobalt ferrite spinel for cleaning reactor? [closed]

I put some cobalt ferrite powder and did some catalytic test and I can't clean my reactor very well. I have already used aqua regia, hydrochloric and nitric acids, sodium hydroxide at high ...
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Electrode potential for saturated silver carbonate solution

An electrochemical cell is set up to measure the electrode potential $E(\ce{Ag^+}/\ce{Ag})$ using the saturated $\ce{Ag2CO3(aq)}$ solution $(K_\mathrm{sp}(\ce{Ag2CO3(aq)},\pu{25 °C}) = \pu{6.3E-12})$ ...
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Colour of diamagnetic compounds using Crystal Field Theory

I know that the colour in coordination compounds can be explained by CFT in terms of d-d transitions. Are d-d transitions possible in diamagnetic complexes? Why does $\ce{[Co(NH3)6]^3+}$ show colour? ...
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Why is octasulfur present in equation for standard enthalpy of formation of sulfuric acid?

Write a balanced chemical equation corresponding to the standard enthalpy of formation of $\ce{H2SO4}.$ \eqref{rxn:r1} is the given answer, \eqref{rxn:r2} is my answer: \begin{align} \ce{1/8 S8 (s) + ...
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Can chloride donate an electron pair to silver(I)?

According to the Lewis dot structure of $\ce{Cl-}$, $\ce{Cl-}$ has octet fulfilled and should be able to donate a pair of electrons as it is a Lewis base. The Lewis dot structure of $\ce{Ag+}$ seems ...
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What theory accurately explains metallic bonding in beryllium?

Since beryllium is an alkaline earth metal, the bonds between beryllium atoms could be considered metallic and we can use molecular orbital theory (MOT) to explain metallic bonds in metals. Consider ...
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What chemical mechanisms or parameters altered during the usage of buffered extractant for leachability of a soil or sediment?

Toxicity characteristic leaching procedure (TCLP) is an extraction method to simulate a soil or sediment leaching. The method employed two extraction fluids - one is a buffered solution of acetic acid ...
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Why electron moves into 3d orbital after filling of 3p orbital during the excitation of Sulphur and some other elements? [duplicate]

Why electron moves into 3d orbital after filling of 3p orbital during the excitation of Sulphur and some other elements? Why do not it move into 4s orbital after filling of 3p orbital ? I have read ...
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Is haloform reaction considered to be disproportionation? [duplicate]

A question in an exam listed a number of compounds and the task was to find the number of compounds which will undergo disproportionation in conc. $\ce{NaOH}$. One of the compounds was $\ce{CCl3CHO}$, ...
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Why does copper(II) sulfate solution turn black on addition of excess sodium borohydride?

In my laboratory experiment, I was supposed to reduce copper(II) sulfate to copper by means of $\ce{NaBH4}$, an indication of which was supposed to be a colour change from blue (copper(II) sulfate) to ...
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Determining iron(III) content in mixture of iron(II) and iron(III) [closed]

Problem Outline a plan of an experiment to determine the percentage of iron present as iron(III) in a solution containing $\ce{Fe^3+(aq)}$ and $\ce{Fe^2+(aq)}$ ions. You are provided with zinc, a ...
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Shielding vs electron-electron repulsion

Example of shielding: (source) The last electron in the 6s subshell of $\ce {Cs}$ is shielded from the nucleus by the inner electrons. Example of electron-electron repulsion: The electron affinity of ...
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4 votes
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Spontaneous reaction between chlorine and a hypothetical atom

Suppose, my hypothetical element is $\ce X$, whose first ionization energy is $\pu{200kJ/mol}$. An atom of this element will react with an atom of chlorine (assume that I've already dissociated a ...
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Is collision theory applicable only for molecules?

$$\ce{Na (s) + Cl_2 (g)->NaCl(s)}$$ Is collision theory applicable for the above reaction, or is collision theory applicable only for molecules? In other words, do chlorine atoms collide with ...
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My book's claim about the shielding effect of s,p,d and f electrons

It's a relatively unknown Bangladeshi book. It's called "Chemistry-First Paper (Class XI-XII)" by Professor Haradhan Nag According to my book, "Electrons of s and p orbitals produce ...
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What does $n$ represents in "hydrated compound⋅nH2O"? [closed]

On wiki it is written that in "hydrated compound⋅nH2O" $n$ is the number of water molecules per formula unit of the salt. I don't understand what that means and this is indicated in that I ...
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Melting and boiling point of transition-metals, primarily for the groups of Cr and Mn [duplicate]

The NCERT Chemistry book for Grade 12 writes The high melting points of these metals are attributed to the involvement of greater number of electrons from $(n-1)d$ in addition to the ns electrons in ...
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How to calculate rate of carbon dioxide from rate equation? [closed]

The concentration of carbon dioxide that changes with time: $$\ce{CO2(g) + H2O(l) <=>[$k_\mathrm{fwd}$][$k_\mathrm{rev}$] HCO3-(aq) + H+(aq)}$$ How to calculate the integral for the following ...
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2 votes
1 answer
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Can Positive ions satisfy primary valences according to Werner's theory for coordination compounds?

My book (NCERT- Chemistry Part for class 12) Coordination Compounds-NCERT (Page-2) Mentions the following statements as a postulate of Werner's theory: The primary valences are normally ionisable and ...
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Which d block elements in their unipositive ion state show reorganisation and transference of electrons from 4s to 3d?

This question serves as elaboration of another previously asked question. The irregular trend in ionization enthalpy of 3d elements I'll be breaking down the cited phenomenon into steps, according to ...
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Why does low spin character predominate in hexafluoronickelate(IV)?

According to my book there are no unpaired electrons in $\ce{NiF6^2-}$. However, that should not be the case since fluoride is a weak field ligand. Why does hexafluoronickelate(IV) behave as a low ...
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3 votes
2 answers
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What solvent dissolves calcium nitrate but not ammonium nitrate?

I am experimenting with a precipitation reaction between ammonium sulfate solution and calcium nitrate. Calcium sulfate precipitates and can be filtered out easily. I am wondering if there's a way I ...
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21 votes
1 answer
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Why is the boiling point of fluorine lower than that of oxygen?

Fluorine boils at -188.1 °C and oxygen boils at -183 °C, but shouldn't $\ce{F2}$ boil after $\ce{O2}$? Despite being electronegative elements, both are nonpolar molecules and posses dispersion forces ...
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How to make a thin layer of crystalline barium titanate on copper substrate?

Is it possible to create a thin $\ce{BaTiO3}$ crystal layer on a copper plate by putting the plate in a beaker, pouring in heated hydrofluoric acid that has been saturated with $\ce{BaTiO3}$ powder ...
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1 answer
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A problem with Miller indices [closed]

I know how to calculate Miller indices (hkl), but I have found a weird one I can not work out could you please help, I know your you have to expand the plane but after that I’m lost.
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Sodium Hydroxide additives?

We use a 10-15% site made sodium hydroxide solution to remove extruded aluminum residue in a boil out tank from steel tooling in an extrusion press. Our old nitrate/nitrite additive is no longer ...
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Nitrogen dioxide vs Nitrogen peroxide: are they one and the same? [closed]

Are Nitogen Dioxide (NO2) & Nitrogen Peroxide (NO2) one & the same?
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My particles won’t separate without neutralizing the solution. I want to understand why?

I etched active carbon with a concentrated KOH solution and added HCl to neutralize the KOH. Separeted the particles with centrifuge at 4000 rpm. They should be micron sized. My boss asked me to stop ...
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11 votes
1 answer
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Is there oxygen isotope exchange between dissolved CO2 and H2O?

If you had a sample containing an elevated concentration of $\ce{H2^{18}O}$, and bubbled $\ce{C^{16}O2}$ through it, would some of the oxygen-18 isotope be transferred from water to carbon dioxide? I ...
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7 votes
1 answer
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How can we explain solubility of hydrogen sulfide in water?

On my most recent high-school chemistry exam I had a longform question where I was supposed to compare the solubilities in room-temperature water under normal pressure of a few molecules. According to ...
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How long can I keep HDPE plastic in an oven for before it starts to burn?

I am recycling HDPE plastic (chips) in an oven. I left it in the oven for 10 mins and it melted the outside layer of the plastic fine. When I cut into the plastic with a saw after it cooled, there was ...
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-5 votes
1 answer
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Can halogens show -3 or -5 or -7 oxidation state. Why? [closed]

I mean can we think it like if the electrons get excited into the d orbitals and because there are now more than one unpaired electron, why does it only loose them and why don't they accept more than ...
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How do you find oxidation state of the metals of a complex with two coordination spheres?

For example suppose we have $\ce{[Pt(NH3)4][PtCl4]}.$ For the naming of this complex I need to know the oxidation number of the metals; let the oxidation number of first and second $\ce{Pt}$ be $x, y$...
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%s character distribution of phosphorus hybrid orbitals

The following question was asked in the Indian Olympiad Qualifier Chemistry Part I (IOQC) today: For the given compound, %s character of phosphorus hybrid orbitals which contribute to various bonds ...
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1 answer
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Confused about single displacement Reaction [closed]

This question is about predicting reactions Al(s) + FeO(s) ---> no reaction Al is higher on the activity series so why does it result in no reaction instead of replacing Fe?
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2 votes
3 answers
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Under what conditions does manganese dioxide lose its catalytic property?

We know that under standard conditions (room temperature and 760 mmHg air pressure) we have this reaction: $$\ce{2H2O2(l) ->[MnO2] 2H2O(l) + O2(g)}$$ Here, manganese dioxide is behaving as a ...
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2 votes
1 answer
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Combining two reactions in equilibrium with same reactants but different products: What would be the new K?

If I have the reactions : A(g) ⇌ B(g)   K1 A(g) ⇌ C(g)   K2 Am I able to add the equations like done in Hess's law despite nothing canceling out? And if I can do so, is the new equilibrium ...
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Discrepancies in using pOH vs pH to solve H+/OH- concentration change problem

I found an extremely confusing problem in one of the problems we did in class for general chemistry. This was the question: How many moles of $\ce{H3O+}$ or $\ce{OH-}$ must you add per liter of $\ce{...
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Fractional Composition of Acid Question

I present to you a fractional composition question that my professor refuses to answer because he encourages me to use equations without understanding them. Any help you can provide would be very, ...
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1 answer
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Green colored substances forming during electrolysis [closed]

I saw this but the OP didn't provide further information. My setup is a glass container with the anode and cathode as slim metal pieces and using a 12v charger. The solution was a saturated salt ...
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Does hypochlorous acid oxidize hydrogen peroxide?

The following reaction is from https://ncert.nic.in/textbook/pdf/kech202.pdf, p. 11: $$\ce{H2O2 + HOCl -> H3O+ + Cl- + O2}$$ I have to find if $\ce{H2O2}$ is acting like a reducing agent or an ...
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Computing the overall charge of a compound with non-integer coefficients

I have a question about computing the overall charge of inorganic chemicals, where the composition is expressed using non-integer stoichiometric coefficients. Let's say we have $\ce{Hg_{0.7}Cd_{0.3}Te}...
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