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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1answer
218 views

What causes Copper Rose?

We made a solution of Tetrakis Copper(I) hexafluorophosphate and the usual color is yellowish. As it oxidizes to Cu(II), it should turn blue. However, our current mixture has an off color that is ...
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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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Questions about Buffer System (Lab)

I will be doing a lab on Hydrogen Phosphate buffer system tomorrow and I have a few questions about the buffer system. I am not sure if my assumptions are correct. (1) What would happen to the rate ...
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206 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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598 views

Can F2/HF be separated using acid/base solutions in series?

I am trying to verify the results of EPA method 26A (http://www.epa.gov/ttnemc01/promgate/m-26a.pdf). The Method claims to be able to separate and quantify a mixed halogen/halide gas stream. Although ...
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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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813 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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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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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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991 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
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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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What's a natural substitute for baking powder or baking soda? [closed]

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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1answer
896 views

How do I perform a gravimetric analysis of Portland cement?

To determine the silica ($\ce{SiO2}$) content in Portland cement by gravimetric analysis it is digested in $\ce{HCl}$ and the silica residue is eventually measured. The chief constituents are $\ce{...
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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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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 bonds/...
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338 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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MO-Scheme of SCN- and its bonding properties when used as a ligand

I tried to figure out the MO-scheme of the tetragonal-bipyramidal complex trans-$\ce{[Co(en)2(NCS)2]SCN}$ in which the isothiocyanate ligands are bound to the $\ce{Co^3+}$-Ion in $\eta^{1}$-mode (en = ...
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How do I determine the crystal field splitting for an arbitrary point group?

How can I figure out the degeneracy of the d orbitals for a site that has a given point group? Specifically I'm interested in $D_{3d}$ and $D_{3h}$, but it would be good to know how to do it in the ...
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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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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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527 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, $\ce{CO3^{2-}}$...
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104 views

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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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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Can silica gel beads cause silicosis if crushed?

Can silica gel beads (which I believe are amorphous) when crushed to dust cause silicosis?
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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 ...
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2answers
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Elemental Silver Colour

What is the colour of elemental Ag? I have doubt whether it is black or silver in colour. In Tollens' test, we get a silvery precipitate of elemental silver - hence silver in colour. I have read ...
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1answer
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Why Fe(CO)5 exists, but Fe(NH3)5 doesn't?

Like in title: Why $\ce{Fe(CO)5}$ exists, but $\ce{Fe(NH3)5}$ doesn't? Edit: As Jan Dvorak pointed out, it may exist. If so: why is it so unstable?
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456 views

Zinc Picolinate - Positive, negative or neutral charge?

I'm going to be using a finings agent with a positive charge to remove negative trub from a solution (beer). I would like to keep some chelated zinc in the solution - ideally zinc picolinate - so ...
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1answer
549 views

What does under-stoichiometric or stoichiometric mean?

When people talk about oxides like $\ce{SiO2}$ or $\ce{Al2O3}$, they use expressions like stoichiometric or under-stoichiometric. I understand that this refers to the relative composition of materials,...
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200 views

An example to illustrate the difference between an inversion operation and a twofold rotation

Reading in Atkin's Inorganic Chemistry book, I cam accross: Although an inversion and a twofold rotation may sometimes achieve the same effect, that is not the case in general and the two ...
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1answer
654 views

How to separate lead condensate from aluminum

A common problem in shooting sports is precipitation of lead onto aluminum suppressor baffles. (The lead presumably comes from both lead styphnate priming compound and from the base and bearing ...
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Why does the equilibrium law work mathematically and what does it really mean [duplicate]

For example consider: $$aA + bB \rightarrow pP + nN$$ where $a, b, p$ and $n$ are moles. The equilibrium constant is $$ \frac{[P]^p [N]^n }{[A]^a [B]^b}$$ Where does this come from? I don't ...
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1answer
156 views

metal salt solutions g/l means hydrate or anhydrous

I want to redo an experiment. They've used Nickel chloride: 40 g/L Nickel chloride can be bought in two forms: anhydrous ($\ce{NiCl2}$) and hydrate ($\ce{NiCl2....
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1answer
912 views

About the nomenclature: manganate or manganite?

I am a bit confused about the correct name of $\mathrm{LaMnO}_3$. Is it lanthanium manganate or lanthanum manganite? I was assuming that since $\mathrm{SrTiO}_3$ is called strontium titanate, $\...
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Why does Bismuth only create a +3 ion instead of a +5 ion?

It has 5 valence electrons, but only loses 3 of them to make a +3 ion. Why does this occur? I believe it may have something to do with how losing 3 electrons leaves you with the p sublevel full, but ...
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What is the range of sizes for molecular systems?

Molecular systems - are in a simple count systems made up of molecules. But almost every system, surrounding us are molecular than. Considering the molecular systems in terms of chemistry compels us, ...
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Formula for hypo [closed]

Can someone please tell me the chemical formula for just "Hypo"? This question came up in previous exams and I don't know what is the general /chemical formula for just "Hypo". I can find the formula ...
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Which salt precipitates from a solution of ammonium oxalate and silver nitrate?

I am supposed to write the precipitation reaction for $\ce{(NH4)2C2O4 + AgNO3 ->[\ce{H2O}]}$ Is my equation correct? I left out the Spector ions. $$\ce{4(NH4) + 2 C2 +O4\rightarrow 4(NH4)2CO3}$$
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Clathrate Compounds with Quinone

I prepared a compound "$\ce{SO2}$-Quinolclathrate" by dissolving hydroquinone and sodium sulfite with hydrochloric acid in warm water. After this, I tested a little sample of the product on a flame ...
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1answer
925 views

Crystal Field Theory diagram

I need to draw a simple crystal field splitting diagram and identify the lowest-energy spin-allowed ligand field band in the electronic absorption spectrum for [MnCl6]2-. I know the basics of the ...
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Vycor + hydrogen at 750°C - reduction? [closed]

Does anybody have experience with Vycor 96% silica tubing in hydrogen at bright red heat, around 750°C, regarding its reduction to silicon monoxide or elemental silicon?
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4answers
888 views

large wavelength range and list of x/y numerical data points of elements

I'm trying to get a set of FTIR or (FTIR like range) x/y numerical data points for a couple of elements, namely Silver, Platinum, Palladium, Gold and Sodium. I've looked on line and found images ...
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2answers
152 views

Carbon dioxide in lime ground

Is storing carbon dioxide in limestone a good idea? Wouldn't that lead to a reaction like $\mathrm{C}\mathrm{O}_2 + \mathrm{H}_2\mathrm{O}\to {\mathrm{C}\mathrm{O}_3}^{-2} + 2\mathrm{H}^+$ And then ...
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Double Displacement Reactions that produce gas [closed]

What type of double displacement reactions can form a gas. How can i determine if a double displacement reaction will form a gas?
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1answer
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Testing a sodium aluminate solution

I prepared some sodium aluminate by reacting a strong $NaOH$ solution with aluminium foil and filtering the result. I now have a clear solution and I'm not sure what it is. I stopped adding aluminium ...
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3answers
27k views

Boiling point of a liquid increasing with temperature?

In my textbook, a statement is given, as follows: Boiling point of a liquid increases with increase in temperature However, I was wondering, isn't this wrong? The boiling point of a liquid always ...
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2answers
105 views

How can you tell how much actually reacted in an acid base reaction

If you facilitate a weak acid base reaction. i.e. $\ce{NaOH + H2SO4}$. All of it may not react and the solutions will not neutralize. How can you determine how much actually reacted?
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The Crisscross method for finding the chemical formula

I am reading this wikipedia article that I don't understand. What I don't understand is: suppose we have two elements $X$ and $Y$ having oxidation numbers $x$ and $y$ respectively. Can we prove ...
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2answers
307 views

What does Cobaltous Oxide form with metal oxides?

I'm searching for the products to the following reactions: $$\ce{CoO + MgO -> } \small\text{(cobalt pink)}$$ $$\ce{CoO + SnO -> } \small\text{(cobalt green)}$$ I know that corresponding ...