The branch of chemistry concerned with the properties and behaviour of inorganic compounds.

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Chemistry of Walter Mitty's negative developer/stop bath/fixer?

I asked a question here How can Walter Mitty examine the negatives of photos in the bright sunny day? Commonly known, there are three steps using chemical baths to bring out the images of negatives: ...
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16 views

can sodium persulfate etch or damage a titanium heater?

I use Sodium Persulfate to etch copper on a PCB process. I have been using glass heater on the etching tank but the glass is too fragile; it breaks too easily. I read that titanium heater is used ...
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641 views

Why is O=C=O nonpolar?

I understand that polarity is electronegativity difference and that the more the electronegativity difference, the more polar the bond. However, I have read that O=C=O is nonpolar. This doesn't make ...
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25 views

Electrochemistry question about equilibrium in half cell reaction

Given the following half-reactions: $\ce{Ce^{4+} + e− -> Ce^{3+}}$ E° = 1.72 V $\ce{ Fe^{3+} + e− -> Fe^{2+}}$ E° = 0.771 V A solution is prepared by mixing ...
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26 views

What is the white crystalline precipitate obtained when magnesium ions react with ammonium biphosphate in the presence of ammonium hydroxide? [on hold]

What is the white crystalline precipitate obtained when magnesium ions react with ammonium biphosphate in the presence of ammonium hydroxide? Please give the formula as soon as possible.
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28 views

What makes a ligand stronger than another?

A ligand is a neutral molecule or negative ion with at least one lone pair of electrons which forms a dative covalent bond with a complex ion that has a vacant, energetically accessible orbital. It ...
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29 views

Carbonyl/Nitrosonium Complex Stability

Why is the nickel complex exhibiting the strongest pi-bonding? From what I understand, charge density plays a role. Also we need some empty orbitals on the metal cation, since we're looking at ...
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28 views

Explanation for increase in the number of oxidation states for transition elements from Sc to Mn of the 4th period

From Sc, to Mn, the number of oxidation states increases from one (Sc) to seven (Mn). The explanation for this is because the unpaired 3d electrons can be lost along with the 4s electrons during ...
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26 views

Finding the chemical name of SnMg₂O₄

Can somebody help me in identifying the name of $\ce{SnMg_2O_4}$? Other examples are $\ce{ZnAl_2O_4}$ (Zinc Aluminate), $\ce{ZnIn_2S_4}$ (Zinc Thioindate). Please kindly provide the reference if ...
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1answer
50 views

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
33 views

How many ligands in Heme?

How many ligands does Fe has in heme ? I am not sure how many are in heme and how many in cytochrome C. Its about iron complexes.
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39 views

Are there practical chemical reactions that do mechanical work without heat or electricity?

Every day we use chemical reactions to perform mechanical work by creating either heat (e.g. in a piston engine) or electricity (batteries). I know muscles perform work by taking stored chemical ...
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22 views

Oxidation numbers of phosphorus pentachloride

I read detailed explanations of what oxidation numbers/ states represent and it boils down simply to this: If it's positive, it shows how many electrons the element lost, and in the case of a negative ...
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1answer
41 views

Which is more soluble in water and why: K₂HPO₄ or CaHPO₄?

If I dissolve $\ce{K_2HPO_4}$ and $\ce{CaHPO_4}$ in water (two different reactions), the latter shows better solubility. Is it because $\ce{Ca^{2+}}$ has ha higher valence of $2$ than $\ce{K^+}$, ...
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1answer
32 views

Why is oxygen absorbed in a colorless alkaline solution of pyrogallol and why does it turn dark brown?

I'm reading about recognition and identification of gases. My book says: Oxygen is absorbed in colorless alkaline solution of pyrogallol and turns dark brown? I'd like to know why and how. ...
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22 views

How is the oxidation number related to the group number?

How is an oxidation number of an element related to its group? I was trying to answer an homework question.The question was: If an element X forms the highest oxide of the formula XO3, then it ...
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1answer
61 views

Melting alumina ($\ce{Al2O3}$)

First of all, I am new to StackExchange, so let me use this occasion to greet you all. My inorganic chemistry is at a basic level, so my question is, if I heat alumina ($\ce{Al2O3}$), to its melting ...
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30 views

Magnesium Sulphate and Calcium Nitrate reaction requires heat

In an effort to create Calcium Sulfate I mixed Magnesium Sulfate and Calcium Nitrate but no precipitate was formed and so I started to boil down the mixture to concentrate the reactants where upon a ...
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53 views

What does 'organic/non-ogranic molecule' means exactly?

I am new to the organic chemistry world. I was delving for the exact answer to my question, and I've found some results: In wikipedia (french), is was mentioned that an organic molecule contains ...
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What kind of suspension liquid should be used with bulk ferrofluid (so it does not stain the glass)

I am an Engineering student and I'm currently on a project meant to demonstrate some properties of magnetic fields. I want to put my bulk ferrofluid in a glass bottle with a suspension solution (A ...
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1answer
46 views

Rust forming and being washed off by the same substance

I have noticed that when exposed to water for a few days the water turned the steel in my wagon into rust. After several more weeks the rust that formed is dissolved and once I pour the water out ...
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2answers
100 views

Difference between backbonding and hyperconjugation and conjugation [closed]

What is the difference between backbonding and hyperconjugation and conjugation? I mean the basic differences as all are concerned with donation of electrons. What is the most striking effect of each ...
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70 views

what makes mercury vapours so harmful

I just read an experiment in which mercury has to be heated and in the same experiment there was a note saying do not inhale mercury vapours as they are very harmful I just can't get the point why ...
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48 views

I need help with this exercise i need to find all chem elements

White solid A water insoluble cleaved hot to solid gas B and C. B is insoluble in water and in $\ce{HCl}$ but soluble to $\ce{HNO3}$ the react gives solution D and E colorless gas which becomes red ...
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33 views

Does washing soda (sodium carbonate) turn into baking soda (sodium bicarbonate) over time?

I have some sodium carbonate. But it's over 20 years old and was not kept in tight bottle. I wonder if this compound absorbs $\ce{H2O}$ and $\ce{CO2}$ from air. I guess I'd need to burn it a little ...
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Calculating Electronegativity of Fluorine [closed]

Calculate the electronegativity of Fluorine from the following data. EH-H = 104.2 kcal/mol EF-F = 36.6 kcal/mol EH-F = 134.6 kcal/mol XH = 2.1 How to solve? Any wiki or link to somewhere where ...
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37 views

Which is more acidic? CO or CO2?

Q1)Which of the given compounds is most acidic? $\ce{CO}$ or $\ce{CO2}$ ? How to solve(explanation)? EDIT: Q2) $\ce{BeO}$ is amphoteric while $\ce{B2O3}$ is acidic - True/False?
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2answers
66 views

Ionization Energies of Sulphur and Oxygen Anions

Which of the following are in the correct order of their Ionization Energies?(Multi-Answer Question) a) $\ce{O > S > S- >O-}$ b) $\ce{F > F- > Cl- > Cl}$ c) $\ce{O > O- ...
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2answers
49 views

Sulphur oxoacid forming

I got this reaction and I can't figure out the end products $$\ce{SO2 + S + CaO + Na2SO4 -> Na2S2O3 + ~?}$$ Guessing some calcium sulphur salt should form, but which one?
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1answer
50 views

Why does Mercury have low melting and boiling points?

Many metals have high melting and boiling point but Mercury has low melting and boiling point. What are the possible reasons?
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79 views

Balancing redox equation

So I had these two reactions that confused me .. I tried the standard way of balancing it (Putting oxygen number everywhere, +1,+2,-2 etc.) and then go on with it but it didn't work So anyways here ...
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NCl₃ + H₂O → NH₃ + HOCl , the resulting solution is acidic, basic or neutral?

When $\ce{NCl3}$ is dissolved in water, $\ce{NH3}$ and $\ce{HOCl}$ is formed. Can you please explain me whether formed solution is acid or basic or neutral? thank you!
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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. Would you please explain me the reason ...
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72 views

Why does calcium carbonate decompose into calcium oxide?

Why does calcium carbonate, when heated strongly, decompose into calcium oxide and carbon dioxide? What is the mechanism? Can someone illustrate the means by which this happens? What ...
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1answer
49 views

Any suggestions how to solve this?

$m(\ce{FeSO4. $x$~H2O})=20.0\:\mathrm{g}$ $N(\ce{H2O})=3.03 \cdot10^{23}$ $x=?$ What I've done: (1.) \begin{aligned} m (\ce{H2O})&= \frac{N(\ce{H2O}) \cdot M(\ce{H2O})}{N_{A}}\\ ...
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reducing chloroplatinic acid to platinium

I need help with understanding inorganic chemistry, if anyone could help I would be so thankful. I am reducing chloroplatinic acid to platinum nano-particles using sodium citrate and a second method ...
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91 views

Why are many silver salts insoluble?

For example, silver chloride, silver sulfide, and silver oxide are three exceedingly stable silver salts in water solution. Why is it that silver forms such stable salts? Does this have to do with ...
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1answer
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Why is Technetium unstable?

Technetium is probably the most awkward element of the periodic table for me. It seems to me that Technetium is an exception, in the sense that it doesn't have any stable isotopes, despite having a ...
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square planar geometry in metal complex

I don't understand what this statements wants to say, "Square planar geometry is favoured by ligands that can form pi bonds by accepting electrons from metal atoms or ions" How is this possible I ...
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Coordination number for $\ce{BeCl2}$

I am confused, should it be 2 or 4? If I consider $\ce{BeCl2}$ as a chain structure the coordination number is 4, and in the gas phase it is 2. Please, could you give an explanation for this?
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Silica, Alumina and Sodium Hydroxide from Caustic Soda solution

I had a solution containing Silica and Alumina in caustic soda. I need to extract the same from the solution separating Silica, Alumina and sodium hydroxide. How can I do it? Please provide the ...
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2answers
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What's a natural substitute for baking powder or baking soda?

What's a natural substitute for baking power or baking soda? I am doing a project where I need a raising agent in liquid form. Naturally, I can't use anything carbonated so baking powder/soda are out ...
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CuI, CuSCN Solubility in Ammonia Solution

I am trying to dissolve copper(I) iodide and copper(I) thiocyanate in ammonia. I am quite sure that they both dissolve in liquid ammonia, and are insoluble in ethanol. If I were to purchase a 2.0M ...
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2answers
48 views

Is NaHCO₃ a carbonate?

I know that $\ce{NaHCO3}$ is sodium bicarbonate, but According to Wikipedia: In chemistry, a carbonate is a salt of carbonic acid, characterized by the presence of the carbonate ion, ...
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What are the possible side reactions when preparing iron(III) naphthenate?

I am trying to prepare some iron(III) naphthenate. And the raw materials are : ferric(III) chloride, and naphthenate acid, NaOH, toluene, deionized water Everything worked well in lab scale: final ...
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Co(H₂O)₆ , a low spin coordination complex,why?

Despite $\ce{H2O}$ being a weak field ligand, why is $\ce{[Co(H2O)6]^3+}$ a low spin complex?
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Solvent for copper(I) iodide, copper(I) thiocyanate, silver iodide for HTM deposition; safety for methylammonium lead iodide

I'm a student working in a high school laboratory that is looking to pursue research into perovskite cells for next year, but I have some solubility and safety questions. What would be a good solvent ...
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29 views

Making a reasonable slab of alpha quartz

I want to perform a molecular dynamics simulation with alpha-quartz as my mineral surface. I want to study adsorption of water on alpha-quartz. The most dominant error that I came up with is the ...
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1answer
143 views

How to calculate the equivalent weight or N-Factor of compound(acid, salt, base or etc) using electrolysis concept

Our sir, told us about the concept of equivalent weight using electrolysis and Faraday's Law of electrolysis. We got to know ...
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CFSE/LFSE Explains Hydration Enthalpy

Time and time again textbooks and websites state how wonderful it is that the deviations of Hydration Enthalpies from a linear relationship can be accounted for by the CFSE parameter for the ...