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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532 views

Oxidation State of Nitrogen in N2O

If we try to calculate the oxidation state of nitrogen in $\ce{N2O}$ using the familiar algebraic method, we get oxidation state $+1$ for both nitrogen atoms and that's what I found when I looked it ...
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1answer
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Tanabe-Sugano diagram x-axis question

While reading up on Tanabe-Sugano diagrams I noticed that many diagrams spread over the internet that all seem to come from this Wikipedia article: https://en.wikipedia.org/wiki/Tanabe–Sugano_diagram. ...
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Why doesn't KI(aq) react with HCl(aq)?

When concentrated sulfuric acid is added to anhydrous potassium chloride and the fumes produced are bubbled into aqueous potassium iodide solution, the observed solution would be colourless solution. ...
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79 views

Why is the pairing energy not considered when calculating the crystal field splitting energy?

Consider the low-spin octahedral crystal field splitting diagram for a d4 system. When we calculate the crystal field splitting energy we simply observe the absorbed color of light and calculate the ...
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1answer
436 views

Is there an 'easy' way to determine if a ligand is a pi acceptor, donor or neutral?

First of all I am confused how something can be pi neutral? something either does or doesn't have filled p orbitals for example. given something I have never seen acting as a ligand before like ...
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46 views

How to measure purity of nitrogen gas in a “homemade” way?

Is there any indicator or a way of measuring purity of nitrogen? The lab-way of doing things is out of my reach and I was thinking about a DIY way. I want to decrease oxidising atmosphere in a ...
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2answers
133 views

What is the rationale for calling something as an 'inorganic [organic compound]'?

While studying the main groups of p-block, I have seen many compounds being labeled as an analog to some popular organic compound. For example, borazine is termed as 'inorganic benzene', while boron ...
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1answer
60 views

Balancing complex redox reaction of gold treated with sodium cyanide

How would you balance this reaction: $$\ce{Au(s) + NaCN(aq) + O2(g) + H2O(l)-> Na[Au(CN)2](aq) + NaOH(aq)}?$$ Here’s what I’m came up with. First we can balance any atoms besides hydrogen and ...
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1answer
72 views

What does the salt actually do during electrolysis?

Pure water does not conduct electricity. When you dissolve a salt like $\ce{Na2SO4}$ in water the solution becomes a better conductor. If electrolysis is done on this solution, oxygen and hydrogen ...
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33 views

What happens to dissolved ions when an aqueous solution evaporates?

I'm working on a chemical design project where zeolite crystals containing $\ce{Na+}$ cations is ion-exchanged via an aqueous solution of $\ce{AgNO3}$, $\ce{Cu(NO3)2}$, and $\ce{Zn(NO3)2}$, also ...
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1answer
54 views

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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Why are the densities of europium and ytterbium anomalously low?

Why do europium and ytterbium have lower densities than expected in comparison to other lanthanides? I know it has something to do with the fact that they have half-full and full 4f subshells in the +...
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The covalent bond in HCl and the Lewis model

Can the formation of the covalent bond in HCl be explained through the hybridization model? We know for sure that it can be explained by the theory of molecular orbitals. In this way, it would be ...
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1answer
37 views

19F NMR line spectra

I am trying to figure out the NMR spectra of F3P-BH3 I am solving this out using 2nI+1 rule. IP = 1/2 and IB = 3/2 Hence for this compound, (2nIP+1)(2nIB+1) = (2x1X1/2+1)(2X1X3/2+1) = (2)(4) = 8 ...
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EPR line spectrum of transition metal complex

I'm trying to solve a question that asks for an expected EPR line spectrum of [Mo(C15N)5N)]-3 Mo5+ is d1, hence it has 1 unpaired electron. IMo = 5/2 and IN = 1 I considered nitrogen in CN is in ...
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1answer
47 views

Indirectly Measuring Diffusion of NO2 into Water

I am working on a data science project with the central hypothesis is that air-born pollutants can become water-born through diffusion. The example I am using as a proof of concept is $\ce{NO2}$. The ...
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8answers
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Why do compounds like SF6 and SF4 exist but SH6 and SH4 don't?

Both $\ce{SF6}$ and $\ce{SH6}$ and $\ce{SF4}$ and $\ce{SH4}$ have the same central atom and the same hybridization, but my teacher specifically mentioned that $\ce{SH6}$ and $\ce{SH4}$ don't exist. I'...
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1answer
64 views

How to recycle Lithium-Polymer battery?

I can't manage to find any information about the recycling process and the chemistry behind it. The only thing I see everywhere on the internet - is a guide like this: Step 1 - Discharge the battery. ...
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33 views

Doubt in a nomenclature for equilibrium constant

Why is there $H,N$ and $CO$ attached to the suffix of equilibrium constants? Particularly how to use these as suffixes? Nothing can be extracted from the reaction. There are many $H,N$ and so on like $...
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1answer
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Why does the second electron affinity has an opposite sign of the first one?

Many first electron affinities are positive, indicating a favourable process, but the corresponding second electron affinities are negative. For example, the first and second electron affinities of ...
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2answers
90k views

Why does the solubility of Group II hydroxides increase and the solubility of sulphates decrease down the group?

I know that, solubility of alkaline earth metal hydroxides increases down the group and solubility of alkaline earth metal sulfates decreases down the group. I wish to understand the reason for these ...
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Why does the pH of soft drinks get lower as they go flat?

I am doing an investigation about the chemistry of soft drinks and as part of this I observed the effect of time on the pH of soft drinks fully expecting the pH to increase as the carbonic acid, a ...
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1answer
138 views

What concentration is phenolphthalein indicator ? 1% or 0.1%

I read some information about phenolphthalein indicator, some websites suggested phenolphthalein indicator of 1%, others mentioned phenolphthalein indicator of 0.1%. What is the difference of both of ...
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24 views

Solubility of Aluminium Fluoride in other other fluorine-containing solvents

I encountered a problem which required me to compare the solubility of $\ce{AlF3}$ in various solvents, namely $\ce{HF}$, $\ce{KF}$ & $\ce{KHF2}$ . Further, this problem neither supplied, nor ...
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86 views

Nature of a1g Molecular Orbital Interactions in Ferrocene

While learning about ferrocene I've come across this molecular orbital diagram. What particularly confused me is the nature of the a'1g orbital. My professor taught that a'1g and e2g are considered ...
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34 views

Calculating change in Gibbs Free Energy for a specific type of problem

Can anyone describe what is going on here? $$Si(liq.)=Si_{(1 weight percentFe)}$$ I have come across this statement quite a few times in Metallurgical Thermodynamics.All that they ask for is change in ...
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Why is H2SO4 a good dehydrating agent while other strong acids are not?

I understand that $\ce{H2SO4}$ is a very good dehydrating agent because it is a strong acid, so that it quickly donates $\ce{H+}$ to hydroxide ions in water to form $\ce{HSO4-}$ and $\ce{H3O+}$ .But ...
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44 views

How reliable is spectrometry in the determination of the oldest material Startdust?

After reading one of the latest findings by scientists, Stardust was considered the oldest material on earth. However having not much of an experience with chemistry, I was intrigued upon how ...
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How to name Hg[Co(SCN)4]?

I have basically written the entire name except for the oxidation state of $\ce{Co}$. Mercury tetrathiocyanatocobaltate( ) to know what is the oxidation state of cobalt, I must know the ...
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2answers
59 views

How can potassium hydroxide be prepared from available potassium chloride (KCl) and Quick Lime (CaO)

I live in a small town where Potassium hydroxide is not readily available. (I need above for preparing liquid soap.) But Potassium chloride (KCl) and Quick Lime (CaO) are available as fertilizer and ...
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1answer
233 views

Is silicon dioxide decomposition possible?

I was thinking about this, I made Gibbs free energy calculations and I can't figure out if $$\ce{SiO2(s) -> Si(s) + O2(g)}$$ is actually possible, even at a ridiculous high temperature.
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Is this Ferrous Chloride powder?

I recently ordered a 500g sample of Ferrous Chloride powder. However the powder is in light brown color, and on dissolving it in water, it gives a similar brown hue and it is not a clear solution. ...
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1answer
50 views

Are there terms for ions of chlorine other than chloride?

An ion of chlorine with a charge of −1 is called a chloride ion/anion. Are there terms for other ions of chlorine, for example, $\ce{Cl+}$ or $\ce{Cl^2-}?$
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90 views

Criterion for gravimetric analysis of silver

If the only criterion for gravimetric analysis of silver is solubility of precipitate, which one of the following two compound are we supposed to choose? $K_\mathrm{s}(\ce{AgCl}) = \pu{1.78E-10}$ and ...
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Difference between polarizability and dipole moment? [duplicate]

In my head, any molecule that is very polarisable, has a dipole moment. Is this true? I am very confused and can't seem to find anything that helps my thought, and I can't seem to distinguish between ...
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2answers
201 views

Why doesn't fluorine harm the ozone layer the way chlorine and bromine do? [closed]

I don't understand the chemistry here: fluorine is a halogen too. I read that fluorine in the atmosphere readily forms HF, which is (somewhat) stable and doesn't catalytically break down ozone. But, ...
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120 views

why do we see characteristic colors of alkali metals in oxidizing flame?

I am a high school student and I am a little confused in a topic, My confusion is that: We know alkali metals and their salts imparts characteristic color in oxidizing flame, for example: Lithium ...
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34 views

What would be the identification reactions of selenate(IV) ion? [closed]

I have not been able to find any $\ce{SeO3^2-}$ identification reactions anywhere. Are there any?
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72 views

Nernst equations for the reduction of sulfate(IV) and nitrate(V) anions

Write a Nernst equation $(\pu{25 °C})$ for system: $$\ce{SO3^2- + 3 H2O + 6 e- -> S^2- + 6 OH-}\tag{R1}$$ and system: $$\ce{NO3- + 3 H+ + 2 e- -> HNO2 + H2O}\tag{R2}$$ I am not really sure if ...
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Why does tungsten(VI) oxide have higher melting point than tungsten(VI) fluoride?

I'm learning about ionic bonding and polarizability. Larger anions with higher charge should make more polarized ionic bonds. $\ce{O^2-}$ is both larger and has higher charge than $\ce{F^-}.$ So, why ...
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135 views

Products of silicate synthesis

I'm attempting to make a hard refractory cement to apply over kiln brick made of sodium silicate and Perlite. This creates a very good kiln brick, however they are susceptible to abrasion. I've been ...
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1answer
95 views

Terminology for describing nuclei participating in metallic bonds

I've read many times that in metals (for example sodium metal), what constitutes the crystal lattice is an arrange of atoms, since no electron is given or lost, they are just shared between all the ...
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997 views

Do XeF2 and XeF4 react with SiO2?

A question came in my test asking which of the compounds are not stored in glass. The answers were $\ce {HF, XeF6, XeF4, XeF2}$. I know about $\ce {HF} $ and $\ce {XeF6} $ but not about the other two. ...
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Calculating the solubility for chromium(III) hydroxide using the complex ion constant

Problem $$ \begin{align} \ce{Cr(OH)3(s) &<=> Cr^3+(aq) + 3 OH-(aq)} &\quad K_\mathrm{sp} &= \pu{6.7E-31} \\ \ce{Cr^3+(aq) + 4 OH-(aq) &<=> Cr(OH)4-(aq)} &\quad K_\...
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Chemical equilibrium constant problem

In a equilibrium reaction $\ce{CO {(g)} + H2O {(g)} <=> CO2 {(g)} + H2 {(g)}}$, initial concentrations of $\ce{CO}$ and H2O are equal and are 0.3 mol/dm3. What is the equilibrium constant of ...
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1answer
127 views

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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29 views

Is sodium aquo complex a Brönsted-Lowry acid?

I know that according to Brönsted-Lowry theory, a base is a proton acceptor while an acid is a proton donor. Also, the acid-base pair that differs by a single proton is a conjugate pair. If this is ...
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1answer
38 views

Sound of ringing gels [closed]

I'm searching for an audio file of the ringing of a ringing gel - does anyone know a source? (I already searched on different video- and sound-platforms and looked up in the literature)
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2answers
15k views

Synthesis of Potassium Trioxalatoaluminate (III) Trihydrate

We mixed $\ce{Al}$ powder and hot water. Then we added $\ce{KOH}$ to the $\ce{Al}$ solution and it bubbled heavily (producing $\ce{H2}$). When that was over we added oxalic acid dihydrate to the ...
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1answer
104 views

Isn't water a Lewis base in the ammonia–water reaction?

Exactly one of these statements is false. Which one? (a) When ammonia dissolves in water, the latter behaves as a Lewis base. (b) The conjugate acid of $\ce{H-}$ is $\ce{H2}.$ (c) Boric acid is a ...

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