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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How to predict which complex is formed and which are soluble? [closed]

How does one come to know (in this table) which metal cations form ammonia complexes and which ones form hydroxy complexes on reaction with $\ce{NH4OH}$ Another question which I have is, how can we ...
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Why does CCl4 not undergo hydrolysis while other chlorine-derivatives of methane do?

In one of my textbooks, I came across a question as to why does $\ce{CCl4}$ not undergo hydrolysis. The answer given went along the lines of carbon lacking a vacant d-orbital to accept the lone pair ...
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Is there a simple and inexpensive way to generate nitrogen gas?

It's fairly easy to generate a significant yield of hydrogen gas simply by reacting zinc metal with $\ce{HCl}$ or aluminum with $\ce{NaOH}$ solution. But is there a simple and inexpensive chemical ...
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How to calculate the mass of magnesium necessary to produce a certain volume of hydrogen gas?

How many grams of magnesium metal are required to produce 44.8 liters of hydrogen gas at STP according to the chemical equation shown below? (Answer: $\pu{48.6 g}$) $$\ce{Mg(s) + 2 HCl(aq) -> MgCl2(...
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Thermal decomposition of K2CO3

$\ce{K2CO3}$ doesn't boil. It thermally decomposes at $\pu{1200 ^\circ C}$. However, I find conflicting information online about this. Roughly what I have found say three inconsistent things: It ...
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Why do bubbles form when a reactive metal is placed in a less reactive metal's salt solution?

What is the gas that if formed when a reactive metal is placed in a salt solution of a less reactive metal? Theoretically, it should just be a simple displacement. I know that this question has been ...
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Why is the pH level of carbonation loss decreasing then increases afterwards?

We have done an experiment of the titration of unsealed sprite soda to find the amount of carbonic acid being loss on various duration (0 to 1 hour), due to decrease pressure. The calculation was to ...
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Comparing strength of oxoacids of grp 17 [closed]

How can we compare the acidic strength of oxoacids of different members of grp 17? For a given halogen the strength Inc with the no. Of o atoms as I read but for different halogens I am getting ...
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Lead's affinity for oxygen in the cupellation refining process

My inorganic chemistry textbook1 says: Cupellation is a process, where crude gold is taken in a small bowl called cupell and melted in the presence of air. Due to high oxygen affinity of $\ce{Pb}$, ...
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Is this a correct way to write a chain reaction?

I don't know much about chain reactions and how I understand them, they are just a series of chemical reactions where the products of the preceding reaction act as the reactants for the succeeding ...
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Why does 'softening' of lead oxidise only elements other than lead?

In a flowchart describing the steps to refine lead obtained after the reduction step, my book1 gives a short note on the process 'Softening of lead' where the crude lead is melted in the presence of ...
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How to draw the structure and find the oxidation number of Phosphorous in H2P2O7 [closed]

Find the Oxidation number of Phosphorus in $\ce{H2P2O7^2-}$. So I thought of drawing the lewis structure to find the oxidation numbers. Because I wasn't sure if Oxygen was bonded to a Hydrogen or not. ...
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I am having problem with this question including topics of redox reactions and charges [duplicate]

What is the oxidation number of $\ce{Fe}$ in $\ce{K4[Fe(CN)6]}$? This seems to be a pretty easy problem. Just input the oxidation numbers of everything and equate for 'x'. But the problem is that I ...
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Understanding formulas for PZT

In the slides i'm studying (about the production of PZT), is given the following formula for lead zirconate titanate : $$\ce{PbZr(Ti)O_3}$$ with the explanation: It is a solid solution of two oxides: ...
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When is a buffer solution considered efficient?

By this I mean what is the rigorous definition of a buffer solution? I know that a buffer is a solution able to resist changes of $\mathrm{pH}$, but how much resistance to $\mathrm{pH}$ does a ...
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Does pure HCl (without water) is an acid? [closed]

Hydrochloric acid is always discussed as dissolved in water, and acidity is measured in terms of pH by the concentration of the hydronium ion. Is pure HCl still an acid, and if so, how can we measure ...
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How much NaOH I have to add to increase pH?

I'm stuck in solving this problem. I have two solution of $\pu{5 M}$ $\ce{H2SO4}$ that needs two consequential $\mathrm{pH}$ increasing: the first from the natural $\mathrm{pH}$ of $\pu{5 M}$ $\ce{...
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How do I calculate the humidity inside sealed containers containing mixing salts?

At $\pu{25 ^\circ C}$: saturated Magnesium chloride $\ce{MgCl2}$ keeps humidity 33% inside sealed containers. saturated Sodium chloride $\ce{NaCl}$ keeps humidity 75% inside sealed containers. I ...
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How to calculate Revelle factor using only pH, DIC and TAlk for seawater?

I have the temperature, salinity, $\mathrm{pH},$ dissolved inorganic carbon (DIC) and total alkalinity (TAlk) values for an estuarine water sample. I want to calculate the Revelle factor. The Revelle ...
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Reaction of borax with NaOH

How does borax react with NaOH? My textbook says that sodium peroxoborate is formed. I couldn't find the reaction anywhere else. Can anyone verify as well as explain it?
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What exactly is formed when K2Cr2O7 is reduced?

I read on Wikipedia and in many books that when $\ce{K2Cr2O7}$ is reduced, it forms $\ce{Cr^3+}$ and a change is noticed from orange color to green. I want to know in what exact complex/salt/compound $...
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Why isn't the chemistry of a zinc-air battery (meaningfully) hindered by an activation energy barrier?

Virtually every source I've read pertaining to zinc-air batteries explain the chemistry of it either using these formulae or a simplified version of them: $$ \begin{align} &\text{Anode:} &\...
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How can one reclaim isotopic cadmium from a solution of acid, i.e. H2SO4 or HCl etc.?

I have dissolved isotopic cadmium-114 with $\ce{H2SO4}$ and or $\ce{HCl}$. Now that I have the cadmium-114 in solution, precipitating out $\ce{CdSO4}$ and or $\ce{CdCl2}$, how can I reduce these ...
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How Do I Determine The Strength Of Two Ammonia Solutions Using Titration Methods? [closed]

Two housewives disagreed on the strength of an ammonium cleaning agent. Housewife A thought that her brand was more effective than the brand used by housewife B. Plan and design an experiment that ...
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Order of boiling point of group 14 halides

Find out the species having lowest boiling point: (A) $\ce{SnCl4}$ (B) $\ce{GeCl4}$ (C) $\ce{SiCl4}$ (D) $\ce{CCl4}$ I have considered the inert pair effect of $\ce{Sn}$ here which will make the ...
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What is happening to my chlorine dioxide when I add too much bleach or citric acid?

I have some sodium chlorite and Chinese mystery powder which are meant to be mixed with water, then mixed together to form chlorine dioxide. I wanted to try a more food safe (and less mysterious) ...
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Strength of OH bond

This question might seem a little general, but how can we know the strength of the OH bond of third period element hydroxides? Does it increase across the period or does it decrease?But more ...
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Why is H5PO5 not called as phosphoric acid? [closed]

Recently, my course of inorganic chemistry has begun, and in the nomenclature of inorganic acids, our professor told that phosphoric acid is $\ce{H3PO4}$ and phosphorous acid (orthophosphorous acid) ...
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On heating in the Earth's atmosphere, can magnesium react with nitrogen to form magnesium nitride?

This question is derived from a question asked in my school test. What happens when a magnesium ribbon is heated in air? My first response was the formation of magnesium oxide $(\ce{MgO})$ when ...
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Why does C2 molecule consist of two pi bonds whereas O2 follows general rules? [duplicate]

Why does C2 molecule consist of two pi bonds whereas O2 follows general rules? NCERT textbook talks about the presence of four electrons in pi molecular orbitals. But when O2 molecule follows general ...
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Constructing a molecular orbital diagram of hydrogen peroxide [duplicate]

This is an old exam question. We've had a few recorded lectures but I'm finding it really hard to put the concepts together. Our professor has taught the class so many times that he sorta rushes ...
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Why is dinitrogen tetroxide a planar molecule?

I was wondering why $\ce{N2O4}$ is a planar species in spite of having a σ-bond in between the two $\ce{N}$ atoms for free rotation. Does it not form a conformer?
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Why there is no position of H and He in Lothar Meyer's curve?

I see Alkali metals occupy the peak points. $\ce{H}$ is not an Alkali metal. There's no $\ce{H}$ in the graph. So no point before $\ce{Li}$. Inert gases occupy place on the ascending portion of graph. ...
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Why does the Electron Affinity of Selenium is more than that of Oxygen? [duplicate]

I got that the electron affinity of oxygen is due to its smaller size which leads to more repulsive effect relative to that of lower groups. But, I am bit confused in why the order $\ce{S > $\bf{Se}...
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If Oxygen has a lower electron affinity than Sulfur, then why doesn't sulfur has a lower electron affinity than selenium?

I've read that oxygen has a lower electron affinity (as shown the picture below), because it has a smaller atomic radius than sulfur and thus the electrons experience significant electron-electron ...
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Is it possible to separate Lead(II) sulfate from sulfuric acid?

To prepare lead(II) sulfate $\ce{PbSO4}$ from lead(II) carbonate $\ce{PbCO3}$, can I add excess sulfuric acid to lead(II) carbonate so that the products formed will be excess acid with lead(II) ...
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Does the carbon dioxide dianion exist?

I have heard that the dianion of carbon dioxide, $\ce{CO2^{2-}}$ was named carbonite. Does such a species really exist? Basically, is it stable enough to be a plausible molecule? If so, under what ...
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Is LiNbO3 a perovskite or not?

I am collecting a database of perovskite materials and could not decide if $\ce{LiNbO3}$ is categorized as perovskite or not. $\ce{LiNbO3}$ has been identified as a perovskite [1] as well as non-...
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Equivant mass of double salt

What is the equivalent mass of double salt like dolomite? And what if the double salt is hydrated? Is a double salt taken as a single unit while equating the gram equivalent in any reaction? For ...
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Proton-decoupled phosphorus spectrum of a ruthenium complex

Regarding the complex $\ce{[RuH2(CO)(PPh3)3]}$, there are three possible octahedral stereochemical configurations, a) Draw these isomers indicating which, if any, are chiral and identify the spin ...
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Dihedral angle of gaseous and crystalline HOOH

Why does hydrogen peroxide exhibit a dihedral angle of $111.5^\circ$ in the gaseous state? And a dihedral angle of $90.2^\circ$ in the crystalline phase? I know that in general, there is likely to be ...
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Comparing ionic character of group 1 elements

According to Fajan's rule ionic character should increase down the group as the size of cation increase. So it must be $$\ce{LiH < NaH < KH < RbH < CsH}$$ However, the following two ...
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Finding molarity of hyposulfite solution used in titration

$\pu{0.1 g}$ of $\ce{KIO3}$ is treated with excess $\ce{KI}$ solution. The liberated iodine required $\pu{44 ml}$ of $x$ molar hypo solution. Calculate the value of $x$. I have used the equivalent ...
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What is the role of hydration enthalpy in oxidation?

My textbook says that the greater oxidizing behavior of fluorine than chlorine can be attributed to the high hydration enthalpy of F ions and the low dissociation enthalpy of F-F bond. While the ...
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A question about net ionic equations

I have a question regarding net ionic equations. In a solution, sodium fluoride and hydrochloric acid are mixed together. The "correct" net ionic equation is shown below. However, how can this ...
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Should bromine water be called a solution?

Bromine water is a reagent which is used to test for unsaturation in organic compound. It is $2.8~\%$ bromine in water. In many places, it is refer to as bromine solution. But it is observed that ...
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Chromyl chloride test side products

I have read the test for chloride ions (chromyl chloride test). The reaction is: $$\ce{K2Cr2O7 + 4NaCl + 6H2SO4 -> 2CrO2Cl2 + 2KHSO4 + 4NaHSO4 +3H2O}$$ My doubt here is if chlorine gas is evolved ...
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How to find the potential of a mixed Iron/ Cer solution?

Given the following half-reactions: \begin{align} \ce{Ce^{4+} + e^{−} &-> Ce^{3+}} & E° &= \pu{1.72 V}\\ \ce{Fe^{3+} + e^{−} &-> Fe^{2+}} & E° &= \pu{0.771 V}\\...
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How does pressure influence the dehydration of salts?

It's well known that the boiling point of a substance increases with pressure. I was wondering if something similar happens with hydrated salts and the temperature at which they dehydrate. I mean, if ...
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Free refined value in Rietveld

I have a question about Rietveld refinement The author of this paper claimed that the free refined CN ligand is 1.081. However, they does not show how they got that number. They stated it was based ...

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