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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Reaction between iron oxides to form magnetite

In the notes of a course it is indicated that the reaction of formation of magnetite from iron oxides can only take place if the partial pressure of oxygen is higher than 1 nanobar. $\ce{FeO}$ + $\ce{...
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Nature of Bisphosphonates Binding onto Hydroxyapatite in the Aqueous Phase

In many studies I've read, bisphosphonates (first image) are said to bind remarkably onto bone hydroxyapatite (second image) crystals. It was reported by J. Roelofs et al., (2008) that this mechanism ...
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Tetrachlorophosphonium

I am aware that PCl3 and PCl5 both react with water. In these reactions, water breaks the chlorine atoms off of the phosphorus atom and hydroxyl groups take their place: $\ce{PCl3 + 3H2O -> H3PO3 + ...
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Converting pyrite to iron sulfate

I was reading a Jules Verne book recently, in which the following chemical reaction was done: He placed a layer of branches and chopped wood, on which were piled some pieces of shistose pyrites ... ...
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Why can element gallium be obtained through the electrolysis of sodium metagallate

In the textbook element gallium is produced by the electrolysis of sodium metagallate , which is obtained as the leftover solution of the alkali treatment of bauxite . But why is the metagallate anion ...
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Low temperature sodium salt eutectic [duplicate]

I have a need for a sodium salt that melts below 265 degrees celsius, which will be exposed to liquid sodium metal. The anion is not important, only that it has a sodium cation. I have done a lot of ...
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Reaction between anilinium chloride with ferric chloride

I have a question about reaction between aniline and $\ce{FeCl3}$. I supposed that the following reaction proceeds with formation of brown precipitate: $$\ce{3C6H5NH2 + FeCl3 + 3H2O -> \underset{...
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How can you explain the pKa of the first protolysis of phosphoric acid without using resonance [duplicate]

The pKa1 of phosphoric acid is 2.14. As far as I am concerned, phosphoric acid does not have any double bounds and, as a main-group element, obliges to the octet-rule. This does create formal charges ...
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What does n(Na2CO3) mean?

In my book, $n(\ce{Na2CO3})$ was used to indicate the number of moles of $\ce{Na2CO3}$ without any clarification. Is it common knowledge among chemists that $n(\ce{Na2CO3})$ indicates the number of ...
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Why are group 13 compounds in the +1 oxidation state more ionic than those in the +3 oxidation state?

I know that for group 13 metals in the p block, the stability of +1 OS is generally more than the stability of +3 OS as it is energetically not favourable to attain the higher OS of +3 and such ions ...
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Inorganic question regarding Phosphorus-32 [closed]

I am learning Inorganic Chemistry recently, and doing some pass year paper, and found this question. i am not sure how to identify A3+. Pls Help for question 1 ,2 ,& 3
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Reaction kinetics of exothermic reaction

A colleague said we can’t dissolve a salt (whose solvation enthalpy is exothermic) faster if we increase the temperature (the solubility equilibrium product is not reached) because Le Chatelier‘s ...
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Why are hydrated lithium ions' radii larger than hydrated sodium ions' radii?

Why are hydrated lithium ions' radii larger than hydrated sodium ions' radii i.e. $r_\ce{Li+(aq)}>r_\ce{Na+(aq)}$? If ionic radii increase down the group i.e. $r_\ce{Li+}<r_\ce{Na+}<r_\ce{K+}$...
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Hydrophobic effect/interactions

$\text{Water molecules cause hydrophobic interactions because:}$ $\text{A- they can disrupt surfaces with no hydrogen bonds.}$ $\text{B- they prefer to be close to hydrophobic surfaces}$ $\text{C- ...
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The higher energy to transform Cu(s)/Cu^2+(aq) is not balanced by its hydration enthalpy

The book says that "the higher energy to transform Cu(s)/Cu^2+(aq) is not balanced by its hydration enthalpy". I also read that when we add energy of sublimation and ionization energy , ...
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Does the molecule LiF3 exist? [closed]

Can LiF3 exist? (1 lithium and 3 fluorines), and if so, what would the Lewis dot diagram look like?
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Why are ligand orbitals always lower in energy than the metal orbitals in the ligand field theory?

The below image has been used to represent the ligand field theory for transition metals: (Source: https://chemed.chem.purdue.edu/genchem/topicreview/bp/ch12/ligand.php) Also, other similar images ...
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What happens with electric charges in a salt water battery?

When building a simple salt water battery, consisting of a zinc-anode, copper-cathode and an NaCl-solution, I noticed the following: When closing the circuit, the current decreases over time. (No ...
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Why do diluted sulfuric acid and hydrogen peroxide etch copper only when chloride ions are present?

I've mixed 30 ml 10% sulfuric acid with 20 ml 3% hydrogen peroxide and put a drop of this solution onto copper foil. The solution quickly removed the oxide layer from the copper but did not dissolve ...
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Does the phosphoric acid in drinks lead to leaching chromium from stainless steel 316?

I had considered using a small SS 316 pipe as a straw for sodas. Question being, would the phosphoric acid in drinks leach out chromium, and if so would it be carcinogenic? Hexavalent chromium is ...
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Pcb etching safety questions (HCl, H2O2, H3PO4)

I am about to embark on a pcb etching journey, however, I am not sure what safety precautions I should take when handling the products. I know that the reagents should be stored in their original, ...
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What is the yellow coating seen on the sides of containers storing copper Sulphate?

When storing a solution of copper sulphate, a yellow colored deposit slowly formed on the bottom and sides of the container. What/Why could this be? I'm using it for simple 8th - grade level reactions....
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Can 5% sulfuric acid and 3% hydrogen peroxide form piranha solution?

I'd like to use 5% sulfuric acid and 3% hydrogen peroxide as an etching solution for copper. (In the past I've used dilute hydrochloric acid and hydrogen peroxide but the generation of chlorine gas ...
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Determination of energies in MO diagrams

How do we determine the relative placements of molecular orbitals in their diagrams? I understand that we can use point groups to find symmetry-allowed interactions between orbitals that we write on ...
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Meaning of $\ce{(Si,Al)}$ in $\ce{XY(Si,Al)2O6}$ [duplicate]

On the wikipedia page for pyroxene minerals, it says that pyroxenes have the general formula $\ce{XY(Si,Al)2O6}$, "where X represents calcium (Ca), sodium (Na), iron (Fe II) or magnesium (Mg) and ...
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Solubility of nitrogen dioxide in sodium hydroxide

I know $\ce{NaOH}$ can absorb $\ce{NO2}$, but I could not find any data of solubility of $\ce{NO2}$ in $\ce{NaOH}$ at room temperature and atmospheric pressure. I am trying to figure out how much NaOH ...
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Problem understanding the rate of reaction of reversible reactions

Case 1: $$\ce{CH_3COOH + NaOH<=>CH_3COONa + H_2O}$$ At equilibrium, there remain extremely small concentrations of the reactants (acetic acid and sodium hydroxide), and comparatively large ...
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4 votes
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Smell produced in reaction of sodium hydroxide and aluminium

I was doing an experiment with $\ce{NaOH}$ dissolved in some $\ce{H2O}$ and aluminium. My textbook says that the following reaction takes place $$\ce{2 NaOH + 2 H2O + 2 Al -> 2 NaAlO2 + 3 H2}$$ It ...
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3 votes
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Reaction between hydrobromic acid and sodium borate

Write the reaction for a a sodium borate solution being titrated by hydrobromic acid, assuming sodium borate is represented by $\ce{Na3BO3(aq)}$. I think this is a simple double replacement reaction: ...
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How can we recover potassium and phosphorus from ashes?

When plant based solid fuels, such as firewood, coal etc. are burned, their potassium and phosphorus content stay in the solid ashes. Quick search on the net shows ashes contain about 4% potassium and ...
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Potassium from Potassium superoxide [closed]

Is it possible to get $\ce K$ from $\ce K{O_2}$ using a synthesis reaction? If yes, can you describe it?
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Mass of silver iodide that dissolves in ammonia [closed]

What mass of $\ce{AgI}$ will dissolve in $\pu{1.0 L}$ of $\pu{1.0 M}$ $\ce{NH3}?$ Neglect the change in concentration of $\ce{NH3}.$ Given: $K_\mathrm{sp}(\ce{AgI}) = \pu{1.5E-16};$ $K_\mathrm{f}(\ce{[...
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Is my understanding of conjugate acid-base pairs correct? [closed]

$$\ce{HCl_{(aq)} + H_2O_{(l)}<=>H_3O^{+}_{(aq)} +Cl^{-}_{(aq)}}$$ Cl- is the conjugate base of HCl. Now, can I say that HCl is the conjugate acid of Cl-?
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The oxidation number of N and Cl in NOClO4 ​

My doubt is not about the solution itself, actually I was able to find the solution myself. We could split NOClO4 as (NO+) + (ClO4-) and then proceed, but here I "knew" this split. Is there ...
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Does fluoroantimonic acid dissolve noble metals?

Hello,Does fluoroantimonic acid dissolve noble metals? Nernst equation suggests that platinum would require pH ≈ −20.1 to be dissolved, using Hammett acidity function as an extension of pH ...
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What happens when you mix antimony pentachloride and hydrochloric acid? Will it form chloroantimonic acid? [duplicate]

Learning that fluoroantimonic acid, HSbF6, is produced by the reaction of antimony pentafluoride and hydrofluoric acid, I wondered if it would do the same for the chlorine. I have seen the other ...
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What is the correct way to write dissociation reactions? [closed]

The variants are as follows: For a salt (NaCl): $$\ce{NaCl_{(s)}<=>NaCl_{(aq)}<=>Na_{(aq)}^{+} + Cl_{(aq)}^{-}}\tag{1}$$ $$\ce{NaCl_{(s)}<=>Na_{(aq)}^{+} + Cl_{(aq)}^{-}}\tag{2}$$ $$\...
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-6 votes
1 answer
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Can someone explain this answer in detail? [closed]

The density of iron is $\pu{7.874 g/cm3}$ and its unit cell volume is $\pu{2.364E-23 cm3}$. These values indicate that there are: two Fe atoms per unit cell and the metal is body-centered cubic. I am ...
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2 votes
2 answers
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Why do we need salt in a salt water battery?

I am having problems understanding why we do need salt added to the water to make this shown galvanic cell work. I understand that Zinc wants to dissolve into the electrolyte, resulting in $\ce{Zn^2+}$...
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What is the difference between PEF and PTF bioplastics?

I am trying to research single use plastics replacements, and wanted to explain how PEF and PTF are a good choice. Although as I am researching I can't find clear information about them, also how they ...
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4 votes
2 answers
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Balancing complex redox reaction in a basic solution [closed]

I'm incredibly lost right now. I understand fully how to balance redox reactions in acidic/basic solutions, but the problem my teacher posted is not letting me use the method taught to us. I've ...
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3 votes
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What reaction does happen when molten sodium hydroxide reacts with aluminium?

The reaction between aqueous sodium hydroxide and aluminium follows this equation: $$\ce{2NaOH + 2H2O + 2Al = 2NaAlO2 + 3H2}$$ But it's obviously not possible to balance this equation without the ...
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Why is comproportionation thermodynamically favoured for the synthesis of Mn(acac)3?

I'm currently learning about ligands in school and I'm wondering why does comproportionation happen in the overall equation? There are fewer chemical species on the product side and the entropy of the ...
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Where does the free electron from from in Ag/AgCl reaction?

For the Ag/AgCl half reaction, where did the free electron that AgCl captured come from? Did it come from the Ag wire? If so, why would Ag wire give an electron to AgCl, both atoms are Ag and have the ...
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Why do bubbles form in the reaction Zn(NO3)2 + Mg→ Mg(NO3)2 + Zn [closed]

What are these bubbles? What reaction is taking place?
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Determining which of these has the maximum S-O Bond Length?

S-O Bond length is maximum in? (a)$\ce{SOBr_2}$ (b) $\ce{SOCl_2}$ (c) $\ce{SOF_2}$ (d)$\ce{SO(CH_3)_2}$ Initially I thought it would be (d) since if a Halogen was attached, the S-O bond would become ...
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1 vote
1 answer
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Using the mole ratio to figure out the molecular formula [closed]

It takes $\pu{8.0 cm^3}$ of aqueous sodium phosphate to fully react with $\pu{12.0 cm^3}$ of an aqueous solution of the nitrate of metal $\ce{T}$. If both solutions have a concentration of $\pu{1 mol ...
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Dissociation of phosphorus pentachloride in gas syringe

Phosphorus pentachloride is introduced into an empty gas syringe which has a movable, tightly-f‌itting plunger. The gas is allowed to expand until equilibrium is reached at a temperature at which the ...
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What are compounds where oxygen has oxidation state -1/3 called?

I have heard of oxides, peroxides and superoxides where oxygen oxidation number is $-2, -1, -\frac{1}{2}$ respectively. But I came across a molecule with the formula $\ce{KO_3}$, oxygen has $-\frac{1}{...
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How much nitrogen in fertilizer [closed]

I’m trying a little exercise for fun in chemistry but I don’t find where I’m wrong. Here it is: In $\pu{2 kg}$ of a fertilizer, $\pu{39.7 mass\%}$ is $\ce{(NH4)2SO4}$, and $\pu{15.2 mass\%}$ is $\ce{...
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