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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Is a tetrahedral complex with two symmetric bidentate ligands optically active?

If the shape of of a complex $\ce{M(AA)2}$ (with $\ce{AA}$, a bidentate ligand) is tetrahedral, then is it optically active? Currently I know that it is optically inactive, but I want to know the ...
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For a structure of a compouund optically active, what is the number of stereo isomers if no geometrical isomers are present?

Suppose for example the compounds $\ce{M(AA)3}$ and $\ce{M(AA)3bc}$, with $\ce{M}$, the central metal atom and $\ce{AA}$, a bidentate ligand. What is the total number of stereo-isomers of both? I was ...
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Stability of Lithium hydride over Sodium hydride

Why is LiH more stable to heat compared to NaH? The lithium cation is harder than the sodium cation. The hydride ion is soft. Hence, I would assume that LiH would be more stable compared to NaH, owing ...
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Iodine clock reaction

I have been investigating the iodine-clock reaction for my chemistry project. I have done a great deal of research on the titration of iodate ions, iodide ions and sodium thiosulfate using HCl. But, I ...
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Why is sulphur not written as S8 here [duplicate]

I learnt that sulfur dioxide and hydrogen sulphide react to form sulfur and water. The reaction given was: $\ce{SO2 + 2 H2S -> 2 H2O + 3S}$ So why is the product sulfur written as $\ce{S}$ and not ...
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How does copper reduce dilute nitric acid to nitric oxide and concentrated nitric acid to nitrogen dioxide?

Here are the 2 equations: \begin{align} \ce{3Cu + 2NO3- + 8H+ &<=> 3Cu^2+ + 2NO + 4H2O} & E &= 0.62~\mathrm{V}\\ \ce{Cu + 2NO3- + 4H+ &<=> Cu^2+ + 2NO2 + 2H2O}& E &...
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Why is the solution of ammonium bifluoride more acidic than aqueous ammonium fluoride?

At low concentrations of aqueous $\ce{NH4HF2}$ $(w = 1–2\,\%)$ $\mathrm{pH}\approx 3.$ But aqueous $\ce{NH4F}$ $(w = 20–40\,\%)$ has $\mathrm{pH}\approx 7.$ Yet the equilibria of $$ \begin{align} \ce{...
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Is dehydration of cobalt(II) chloride hexahydrate dynamic equilibrium?

I know that the dehydration of cobalt(II) chloride hexahydrate is a reversible reaction, is it a dynamic equilibrium? $$ \begin{align} \ce{CoCl2·6H2O &<=> CoCl2·2H2O + 4 H2O}\tag{R1}\\ \ce{...
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Why exactly is the conduction band in semiconductors conducting?

Is it because when the electrons are excited to a higher energy level, they can lose energy and fall back down to lower energy levels? Due to the sheer number of antibonding MOs in the conduction band,...
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Fundamentally, what is the difference between redox and acid-base reactions?

For example, consider: $$\ce{NH3 + H2O -> NH4+ + OH-}$$ Here, the $\ce{NH3}$ is acting as a base (By Lewis theory, it is an electron pair donor). Why don't we consider this to be a redox (there is ...
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Titration of H3PO4 and H2SO4 with methyl orange and phenolphtalein as indicators

There are some problems I don't understand how they are solved (I have the answer). Since I can't find anything related to these on the internet, I'm asking about the problem and the answer here. ...
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Alpha particles and nitrogen triiodide

I've been reading Wikipedia's article on $\ce{NI_3}$ (which doesn't contain an $\ce{I_3^-}$ ion, so "nitrogen III iodide" would probably be a better name for it) and getting very confused. I'...
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Cobalt glass colour of potassium as

Question: Cobalt glass colour of potassium as: A) Crimson red B) Lilac C) Apple green D) Brick red I thought option B as true because on flame test, potassium gives lilac colour. But the given ...
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How do I balance redox equations with three reactants?

Could anybody please explain me the concept of balancing redox reactions with three reactants? Either some solving steps or even the solution would be very appreciated. For example, I don't know how ...
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How to draw Lewis dot structures?

What is the most logical and easy to remember step by step method for drawing Lewis dot structures? I'm having trouble drawing a simple one for $\ce{CO2}$.
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What are the necessary conditions for formation of a Hydrogen Bond?

Usually Hydrogen bonds are associated with N,O,F as the atoms involved. In some cases OH---Cl bond is observed as in case of o-chlorophenol. According to the updated IUPAC definition a Hydrogen bond ...
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Multiplicity prefixes for complex compounds with organic ligand

Consider the compound $[\ce{Ni(gly)_2}]$, with $\ce{gly}$ denoting glycinate ligand. Should the name be bis-(glycinato)nickel(II) or diglycinatonickel(II) In my book, it's written that the prefixes &...
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Going from La to Ce, why is the extra electron added into the 4f orbital?

So, I am studying electronic configuration but the elements of the series of the lanthanides confused me. The electronic configuration of $\ce{La}$ is $\mathrm{6s^2\,5d^1}$ and that of cerium is $\...
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Spectroscopy of phosphite

These images were taken from IChO 2002 prep problems. May I please know why there are 7 peaks for C-H? This indicates that there are 6 hydrogens the H in the C-H is coupled too, but I can only find 5 (...
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The definition of formal Charge

Ok, most people including me know that formal charge is just a book-keeping tool. I know how to calculate it, apply it to Lewis structures etc etc. But I am confused in its very basic definition which ...
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1answer
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What is the hybridization of copper in blue vitriol?

My book says that the structure of blue vitriol is the following: From the structure, I figured that since there are 4 water molecules coordinated to the cuprate ion, the hybridization should be $sp^...
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Isn't hydrogen chloride a salt, because it is an ionic compound? [closed]

So I just learned in chemistry that salts are ionic compounds. Shouldn't, $\ce{H+Cl-}$ be a salt since hydrogen ion has positive charge and chloride ion has negative charge? If $\ce{HCl}$ is a salt ...
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How to prepare a solution of Ferrous Iron?

I need to prepare a solution of Ferrous Iron (Fe2+). This solution will be used to test a water filtration system by simulating the Ferrous Iron that is sometimes present in well water. The system is ...
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Why is the enthalpy of solution of hydrated calcium chloride positive?

My book says that the enthalpy of solution of anhydrous calcium chloride is negative because it produces hydrated calcium chloride. But when hydrated calcium chloride is dissolved in water, the ...
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337 views

What is the colour of cesium?

I am confused with the color of cesium. Some websites and books say that it is a silvery white metal, and some say it has a golden colour, and some say it has a silvery golden colour. Among these ...
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Does nascent Oxygen/Hydrogen really exist or just or is it just electron from ionic equation? [duplicate]

Recently I was taught by my teacher that there is no such thing as nascent oxygen neither hydrogen. It just represents Electrons from ionic equations. Then he proceeds to give example of following ...
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Formation of Goethite

Probably a simple question: When you're mixing potassium hydroxide ($\ce{KOH}$) with iron nitrate ($\ce{(FeNO3)3}$) to form ferrihydrate, does the temperature have to be below $\pu{60 ^\circ C}$?
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The effect of nonbonding electron pairs on ozone polarity

I know that ozone is a polar molecule. And our master has used the existence of nonbonding electron pairs on the central atom to justify this subject. I want to know how much the nonbonding electron ...
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Ease of reaction of hydrogen with alkali and alkaline earth metals

The ease of reaction of group 1 metals with hydrogen decreases as we go down the group. But why lithium requires high temperature than sodium, potassium and rubidium? What is exactly "ease of ...
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1answer
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Why does this ligand form 6-coordinate complexes with Transition elements and 8-coordinate complexes with Inner transition elements? [closed]

The ligand given above shows different denticities with common transition and inner-transition metal ion i.e. 6 and 8. The extra two denticities come from the two Nitrogen having 1 lone pair each. I ...
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What is the chemical composition of Ferrous Ferrocyanide?

To this day, iron-cyanide complexes confuses me. So, I want to settle this once and for all. After scavenging the internet, I gathered the following result: $$ \ce{Ferr} \color{blue}{\ce{ous}}~\ce{...
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Characteristics of cations with KCN and excess KCN

How many cations from $\ce{Ag+,Pb^2+,Cu^2+,Cd^2+,Fe^2+,Fe^3+}$ form precipitate with $\ce{KCN}$ but also get dissolved in excess $\ce{KCN}$? I have just been introduced to Qualitative Analysis of a ...
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What is the chemical result and resulting product of putting alabaster (calcium sulfate dihydrate) in water? [closed]

As a sculptor, I use alabaster. I have tried using flowing water and I know it dissolves slowly. I want to try exhibiting a sculpture immersed in water either in a sealed or non sealed container. Are ...
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Why is PbI₄ not composed of lead(II), iodide and triiodide?

$\ce{Pb^4+}$ is reduced by $\ce{I-},$ so $\ce{PbI4}$ cannot exist with $\ce{Pb}$ in $+4$ oxidation state. But if I replace three $\ce{I-}$ with $\ce{I3-},$ then we can have $\ce{Pb^2+}$ similar to $\...
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Do coordination complexes with stronger ligands form more stable complexes?

I read that chelate complexes generally are more stable than monodentate complexes. However, I noticed that in the case of $\ce{[Fe(CN)6]^3-}$ and $\ce{[Fe(en)3]^3+}$, this is not observed as the ...
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Can we use silver nitrate to distinguish between chloride and carbonate salts?

Initially, we are given a solution containing two salts, they can be either carbonate or chloride salts (we do not know their composition initially). Generally, $\ce{AgNO3}$ is used as a confirmatory ...
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Why does/doesn't sodium carbide exist?

(Here, I quote a question from an Indonesian undergraduate Chemistry competition: "sodium carbide reacts with water to form ethyne gas." This is the problem that caused me to ask this ...
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1answer
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Balancing disproportionation reaction of hypoiodous acid

In aqueous solution, the acid $\ce{HIO}$ disproportionates according to the following equation where m, n, p and q are simple whole numbers in their lowest ratios. $$\ce{mHIO → nI2 + pHIO3 + qH2O}$$ ...
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Finding out the validity of the electrolysis of CaS to Ca(OH)2 to S in alkaline electrolyte

I would like to ask for the advice of chemists on how to go about validating a reaction that I have hypothesized as one stage in a chemical plant I am trying to improve. I want to find out whether a ...
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Comparing covalent characters of two halides of group 15

Which is more covalent : NCl3 or PCl5 and why? This question was asked on a test, and the given answer was NCl3. Shouldn’t PCl5 be more covalent since pentahalides are more covalent than trihalides?
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The melting and boiling point decreases down the group up to group 14 (not including transition metals), but the trend reverses from group 15. Why?

In groups 1, 2, 13 and 14, the melting and boiling point decreases down the group with a few exceptions. In group 15 the melting/boiling point increases up to Arsenic and then started decreasing. In ...
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Why doesn't H₄CO₄ exist as a stable compound?

Why doesn't $\ce{H4CO4}$ exist as a relatively stable compound? Its heavier homologue $\ce{H4SiO4}$ seems to exist although it is unstable to some extent but new methods have been able to stabilise ...
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How can metals like magnesium and sodium burn underwater?

Any websites I have found have conflicting answers. One said that they don't actually burn underwater, rather they separate hydrogen from oxygen and burn at the surface. Another actually said that ...
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Making hard water

Does anyone know how to make hard water with a hardness of 200+ ppm in terms of $\ce{CaCO3}$? I live in Seattle and we have very soft water and we need hard water for testing purposes. Obviously you ...
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Reaction between sodium hydroxide and silicon dioxide [duplicate]

I was trying to make sodium silicate according to the following reaction: $\ce{SiO2 + 2NaOH -> Na2SiO3 + H2O}$ I used colloidal silica available as an intestinal adsorbent since reaction with ...
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Why doesn't tantalum and tungsten form amalgam?

User @Poutnik has recently answered a question in which he quoted this statement from Wikipedia: Almost all metals can form amalgams with mercury, the notable exceptions being iron, platinum, ...
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What is "activated red phosphorus"?

[WP = white phosphorus ; RP = red phosphorus ; ARP = activated red phosphorus] A YT channel, Extraction & Ire has a video from two years ago (2018) on converting WP to RP by keeping the former in ...
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Does mercury(II) cyanate exist?

Recently, I have answered a question "Comparing explosive properties of mercury(II) cyanate and mercury(II) fulminate" where stability of cyanate vs fulminate was discussed. While I was ...
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Why does sulphur exist in two forms in solid state, monoclinic and rhombic? Why in one favoured over another at a certain temperature and pressure?

Both Rhombic and Monoclinic sulphur consist of $S_8$ molecules packed together. Yet the former is more stable below $114^{\circ}C$ at 1 atm and spontaneously converts to monoclinic sulphur above that ...
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On what basis are the prefixes α and β given to black phosphorus?

My textbook says the following about black phosphorus: α black phosphorus is formed when red phosphorus is heated in a sealed tube at $\pu{803 K}$. β black phosphorous is prepared by heating white ...

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