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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Sodium Peroxoborate reacting with Sulfuric Acid and Potassium Permanganate

This is one of the reactions I had to undertake in a lab. I think the reason for the test in the first place is to test for the peroxoborate anion in the solution. From my understanding what's ...
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718 views

Arrangement of elements in the reactivity series

I have seen a variety of reactivity series of elements online and also have consulted some books regarding the arrangement of the elements. I understand that the arrangement of elements is based on ...
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How do we get NaClO3 in the reaction between Cl2 and NaOH?

From problem no. 4080 in a Russian example exam set: $$\ce{6NaOH + 3Cl2 -> NaClO3 + 5NaCl + 3H2O}$$ How do we get that $\ce{NaClO3}$? I can't seem to guess. I found this explanation on YouTube, ...
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Which is more acidic HOF or HOCl?

My attempt to the question: We know that more polar the $\ce{O-H}$ bond, the more acidic is the compound. According to electronegativity, the $\ce{O-H}$ bond of $\ce{HOF}$ should be more polar than $\...
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Why do 4d and 5d metals have more orbital overlap than 3d because of size?

When considering the electrical conductivity of metal oxides, they will conduct better if the metals orbitals can reach each other to overlap. Whether this can happen is contributed to by a couple of ...
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38 views

What happens when solution containing two or more cations are electrolysed at an excess potential?

$\pu{250 mL}$ of a waste solution obtained from the workshop of a goldsmith contains $\pu{0.1 M}$ $\ce{AgNO3}$ and $\pu{0.1 M}$ $\ce{AuCl}$. The solution was electrolyzed at $\pu{2 V}$ by passing a ...
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Interatomic spacing vs electric conductivity

I have a theory which may be wrong but I will write it down.If 2 elements at the same group (in solids)have the same crystal structure then the one with the biggest interatomic spacing has better ...
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47 views

Magnetic properties of K2MnO4 and KMnO4

According to me $\ce{MnO4^2-}$→ Paramagnetic $\ce{MnO4^-}$→ Diamagnetic On the basis of this $\ce{K2MnO4}$→ Paramagnetic $\ce{KMnO4}$→ Diamagnetic BUT According to my class teacher $\ce{KMnO4}$...
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Total entropy change for a spontaneous reaction

For the oxidation of iron, $$\ce{4 Fe(s) + 3 H2O(g) -> 2 Fe2O3(s) + 3 H2(g)}$$ the entropy change is $ \pu{–549.4 J K^{-1} mol^{-1}}$ at $\pu{298 K}.$ In spite of the negative entropy change of ...
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Effects of dispersed nitrous oxide on the body

I'm not sure if this question would be more appropriate in Biology SE, but I wanted to know if the euphoric effects of $\ce{N2O}$ are limited to when it is concentrated in the gaseous phase, or ...
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Alternatives to Bayer process for extracting aluminum from lunar regolith

I am exploring ways to produce metallic aluminum from lunar regolith. According to most published results of lunar soil, $\ce{ Al2O3}$ comprises roughly 14% of mare samples by mass with $\ce{SiO2}$ ...
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45 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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40 views

Relationship between molecularity and the reaction order

Should the molecularity be equal or less than the reaction order? Consider the reaction: $$\ce{H2(g) + I2(g) → 2 HI(g)}$$ If we consider the mechanism of this multi-step reaction, the molecularity is ...
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35 views

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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21 views

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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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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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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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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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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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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24 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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28 views

Chemical equilibrium of inorganic complexes

After mixing Cobalt(II) Chloride hexahydrate with ammonium chloride a violet complex forms, what would be the complex formed? It was the precursor for producing hexamine cobalt chloride so I didn't ...
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How solubility in alcohol imply covalent nature

lithium chloride is considered to be an ionic compound,but it is soluble in alcohol,which suggests that it also posses a small amount of covalent character. This is an extract from my book ,when I ...
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Why does bonding in T.M complexes get stronger down the group but bonding in p-block elements gets weaker?

In the p-block, it’s a well-known general trend that down the group, the homonuclear diatomic bond dissociation energies decrease (generally). E.g in group 14: C-C —> 607 kJ/mol Si-Si —> 327 kJ/...
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Does this general hybridization rule really apply?

So this rule is known about hybridization that: if 4 groups (atoms/pairs of electrons) are attached to the atom -> sp3 if 3 -> sp2 if 2 -> sp but isn't that true only to specific elements ...
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How to determine what covalent compound a substance is?

I have been given a substance which is unknown in my class. The substance is white in colour and is in a powder form. I have conducted a few tests and have found out that the substance is a covalent ...
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105 views

Question on d block contraction

For size trend down a group, it is known that:$$Al\gt Ga$$ Due, to d block contraction of gallium. Why isn't this the case when it comes to silicon and germanium? Won't the poor shielding effect from ...
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Which metal bicarbonates do not exist in solid state?

$$\ce{(i) LiHCO_3 (ii) Ca(HCO_3)_2 ​ (iii) Zn(HCO_3)_2 ​ (iv) AgHCO_3}$$ From my prior knowledge compounds i and ii are not solids because of the high hydration energy of Li and the ...
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AlCl3(aq) reaction with NaHCO₃ to form alumina Al2O3

In a demonstration, aluminum foil was add to a solution of $\ce{HCl}$ and allowed to react, the reaction was presented as $\ce{2Al(s) + 6HCl(aq) -> 2Al­Cl3(aq) + 3H2(g)↑}$ After filtration, the ...
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Sodium peroxide and its properties

Sodium peroxide is a strong oxidizing, but when it is added to an acidified dichromate solution then already chromium is present in its highest oxidation state so the color of the solution shouldn't ...
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51 views

Molecular Orbital Theory and s-p mixing

I understand the bulk of MO theory , the formation of the bonding and anti bonding MOs etc. However, the topic about s-p mixing is quite puzzling to me. As a general rule of the thumb, I was taught ...
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What is the product of ammonia reacting with silicone?

I used a soft silicone hose to carry ammonia at ~70 °C. I was surprised to later find the hose had hardened. A quick materials compatibility search for silicone had given me a lot of info but an "...
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Beer Lambert law when complex is tetragonal (Jahn-Teller elongated)

I wondered what modifications there would be to the Beer Lambert law to find the molar extinction coefficients for the solution if the solvent contained the ligands which bind to the metal centre of a ...
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28 views

Obtaining potassium silicate from sodium silicate

Is it possible to obtain Potassium silicate ($\ce{K2SiO3}$) from Sodium silicate ($\ce{Na2SiO3}$) without using expensive lab equipment such as furnaces etc.? For example, Calcium silicate may be ...
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Mercury thiocyanate synthesis

My friend and I are trying to synthesize mercury thiocyanate, however the only reagents we have access to are mercuric acetate and ammonium thiocyanate. We figured that we could possibly force a ...
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Determination of carbon dioxide according to EN 196-2

I struggle with determination of carbon dioxide according to EN 196-2. First of all, I have a problem with absorption tubes' mass not stabilizing. I've tried changing absorbent, washing tube ...
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Acorrect range of concentrations for the reactants in the equilibrium reaction

What would be a correct range of concentrations for the reactants in the equilibrium reaction, $\ce{Fe^3+(aq) + SCN-(aq) <=> FeSCN^2+}$? For a Chemistry project I am measuring the effects of ...
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When writing the net ionic equation, if one of the products ionizes, what is the most appropriate way to account for this in the answer?

Take these two practice problems and their solutions from Ebbing (8th ed) that involve completing the molecular equation, then writing the net ionic equation: 4.42a: $\ce{Ca(OH)2(aq) + 2H2SO4(aq) ->...
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What is “activated red phosphorus”? What made it so long to be discovered?

[WP = white phosphorus ; RP = red phosphorus ; ARP = activated red phosphorus] Tom from Extraction & Ire did a video two years ago(2018) on converting WP to RP by keeping the former in sunlight ...
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Calcium phosphate and calcium acetate

Firstly, I apologize about both the inorganic and the organic tags on this post. I couldn't get a proper tag. If anyone can suggest a better tag, please edit the post. I'm making cooking gel using ...
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The order of increasing Covalent nature in Group 12 (Zn,Cd and Hg)

Suppose $\ce{Zn}$, $\ce{Cd}$ and $\ce{Hg}$ were to form a bond with the same element; say $\ce{ZnCl2}$, $\ce{CdCl2}$ and $\ce{HgCl2}$ Then which of the compounds would be showing most covalent ...
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Change of ionic packing upon crystals are pressurized

When rock salt crystal is pressurized, its FCC structure changes to BCC structure whereby coordination ratio changes from 6:6 to 8:8. At the same time packing efficiency of the crystal decreases from ...
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Is there a way to theoretically estimate the overpotential losses in a battery?

Me and my team are currently designing a battery and are looking to do some pre-experimental analysis of different battery chemistries based on their overpotential losses. I am aware of the Butler ...
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Arrhenius acids and bases

According to the Arrhenius definition of acids: An Arrhenius acid is any species that increases the concentration of hydrogen ions in its aqueous solution. Hydrogen Chloride gas ionises in water to ...
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Adding a base and a salt to a hydrated complex

The question goes like this: $\ce{Fe(NO3)3}$ V= $\pu{1 liter}$ and $\ce{[Fe(NO3)3]} =\pu{0.1 moles/liter}$. Calculate the $\mathrm{pH}$ of this solution using the values of $K$ given. We add a solid ...
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Has mercury(II) cyanate ever isolated as a free compound?

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 cupric ion oxidises iodide to iodine

I have learnt in the qualitative analysis of cupric ions that upon treating its aqueous solution with excess $\ce{KI}$, triiodide ions are formed which can be further tested using starch. The ...
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Conducting cyclic voltammetry in an air sensitive manner

Does anyone have suggestions on ways to conduct cyclic voltammetry on an air sensitive material without shipping the entire set up into a glovebox? This is for redox active organometallic compounds.
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Catalysts and activation energy

Do catalysts increase rate of reaction only by decreasing activation energy? Or can they affect the Arrhenius factor or reaction orders? Like if one catalyst is more effective at increasing rate of ...
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56 views

Crystal Field Theory

When I learned about crystal field theory I had fallen on a paradox. When K4[Fe(CN)6] is formed then three d orbitals are occupied by electrons of Fe2+ pairly and the rest two d orbitals are occupied ...

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