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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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Higher electron donating strengths stabilizing oxidized states

The literature is full of statements that inorganic complexes composed of ligands with higher electron donating strengths are more reactive when exposed to oxidants (see examples below). For instance, ...
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1answer
21 views

Oxidation reaction of dimethylselenide / Selenourea with hydrogen peroxide

For my paper, I need to find the reaction between $\ce{(CH3)2Se2}$ and $\ce{H2O2}$ and between $\ce{SeC(NH2)2}$ and $\ce{H2O2}$. The mechanism below shows how I think it goes. The reaction should ...
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52 views

How do I identify the compound(s) that formed from a failed synthesis of another compound?

A general answer to the question is great, but specified to my problem is very much welcomed. My team had a lab project — to synthesize chrome alum crystals. We first dissolved $0.3 \, \rm g$ of ...
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2answers
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How to measure saturated salinity and mineral levels for flaked sea salt?

I am a sea salt enthusiast looking to make the perfect flakey sea salt. I start with sea water and boil it down to a thick brine. Then with less heat I reduce the brine more slowly and inverted salt ...
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Is magnesium sulfate basic, neutral or acidic?

A question in my college test was whether $\ce{MgSO4}$ is neutral, acidic or basic. I was told to solve this kind of problem by hydrolyzing any ions that do not "come from" a strong acid or a strong ...
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29 views

What methods could be used for determining the concentration of Zn2+ in a solution?

I know that complexometric titration with EDTA is one method. What other methods could be used?
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394 views

Considering the d-d transition how, does tetracyanidonickelate(II) ion exist as a colored complex?

As I refer on google, the resources indicated that, the d block elements which have unpaired electrons as in their ions, when they are making complexes with ligands, they can absorb different ...
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Why do electrocatalysts based on polyoxometalates and carbon materials have a weaker activity/performance in acidic media?

I am testing now some doped N and S doped carbon nanomaterials alone and immobilized in POM for the purpose of developing a nanocomposite that can serve as an electrocatalyst for energy-related ...
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Determining amounts of product and excess reagent remaining post reaction

$$\ce{2FeS2 + 11/2 O2 -> Fe2O3 + 4 SO2}$$ Mass of $\ce{FeS2}$ is $\pu{600 g}$ and mass of $\ce{O2}$ is $\pu{800 g}$. Find the amounts of $\ce{Fe2O3}$ and $\ce{SO2}$ and the remaining amount of ...
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How the sigma, Pi, delta bonds are formed with metal d orbital participation [on hold]

Show how the sigma bond Pi bond and delta bond are formed with metal d orbital participation
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1answer
53 views

How can an electron shield another electron of the same subshell?

While I was preparing for my upcoming exams, I stumbled upon this sentence which is bothering me quite a bit: The contraction of the lanthanoids is due to the imperfect shielding of one electron by ...
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To prepare 2% iodine solution in potassium iodide [on hold]

how to prepare 2% iodine solution in potassium iodide? This is to carry out an experiment to test the amount of fats in several food items. i have iodine crystals, potassium iodide salt .
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How is it possible to increase mercury's specific weight?

Is it possible to change mercury's specific weight to make it heavier? By mixing it with anything? But not by changing its temperature.
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42 views

Reactivity and its meaning

When we say that “potassium” is reactive, are we referring to a potassium atom or bulk potassium as in the solid metal? In other words does “potassium” refer to a type of atom or an agglomeration of ...
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Calcium Nitrate - Why only 18.8% Calcium for fertiliser?

I brought a kilo of Calcium Nitrate for my hydroponic setup. The chemical formula for Calium Nitrate is Ca(NO3)2. I did a quick calculation of its weight: Ca = 1*40.078 N = 2*14.006 = 28.012 O =...
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2k views

Why does urine smell like ammonia?

Apparently, water or $\ce{H2O}$ combines in some way with nitrogen (from the air or elsewhere?) to form ammonia, or $\ce{NH3}$. Where/how in the body is this $\ce{NH3}$ (or whatever nitrate) produced ...
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Does silver oxide react with hydrogen sulfide?

Electronic connectors are often silver plated. However, silver tarnishes fairly quickly and heavily. There exists a widespread misconception that the tarnishing of silver contacts is harmless, because ...
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What are the differences between grade 3 water and distilled water?

I know the definition and properties of distilled water and grade 3 water. But what I know about grade 3 water and distilled water is not sufficient to distinguish them. Is grade 3 water obtained ...
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Comparison between Boron Nitride and Graphite: Interlayer distance

Boron-nitrogen chemistry has attracted significant attention, partly because a B–N unit is isoelectronic with C–C. Furthermore, the radius of carbon and its electronegativity are roughly the average ...
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What is the colour of hexaamminechromium(3)? [closed]

What is the colour of hexaamminechromium(3) when we add extra Ammonium hydroxide to Chromium Hydroxide?
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Mass Percentage [closed]

An aqueous solution of iron(II) chloride contains 5.02 grams of iron(II) chloride and 17.3 grams of water. What is the percentage of iron(II) chloride by mass in the solution?
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A question in stiochiometry [closed]

How many moles of $\ce{NH3}$ are there in $\pu{90 L}$ of it at STP? $4$ $32\times 10^{23} $ $23$ $3.2$ Please explain your answer as much as possible.
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MO diagram of BeH₂

I was learning about the MO diagrams of triatomic molecules and was left slightly confused about $\ce{BeH2}$. A picture of the MO is shown below: When looking at the $\mathrm{1s}$ combinations, I ...
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Why is the melting point of magnesium oxide higher than aluminium oxide?

There's a graph of the melting points of period three oxides. The melting point of magnesium oxide is several hundred Kelvin higher than aluminiumoxide. I can't find any explanations for this on the ...
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1answer
133 views

Only d orbital electrons for spin only magnetic moment

During my chemistry lessons and self studies, I have come upon many instances where I observed that during calculations of spin only magnetic moment of transition elements only the d orbital electrons ...
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Effect of Concentration on Reaction Rate - Calculating Final Concentrations in Solution [closed]

Question asks: Determine the final concentration of IO₃⁻ used in the reaction. Show a complete sample calculation for the (8.0 mL Solution A + 2.0 mL H2O Equation: IO3− + 3HSO3− → I− + 3 HSO4− ...
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Storing hydrofluoric acid before the invention of plastics

The first person to synthesize hydrofluoric acid in large quantities was Carl Wilhelm Scheele in 1771. This acid is known for its ability to corrode glass and metals. What materials were the ...
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1answer
69 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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Self-learning and improvement [closed]

I'm a pharmacy undergraduate and I want to increase my about chemistry ,so what are the books about (organic , general, inorganic) should I read during my summer holiday?
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1answer
81 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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2answers
48 views

Precipitating silver(I) salts from the solution of barium(II) cyanate and iodide

Consider a $\pu{10.0 mL}$ solution containing $\pu{1.0e-10 M}$ each of $\ce{Ba(CN)2}$ and $\ce{BaI2}$. If $\pu{3.5e-9 mol}$ of $\ce{AgNO3(s)}$ is added to this solution, will any precipitate(s) form? ...
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1answer
319 views

Devitrification vs glass transition temperature

This graph comes from a so-called "differential thermal analysis". It is studying the effects of temperature on glass. I don't understand what the difference between "glass transition" and "...
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1answer
37 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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6answers
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Is dehydrating copper(II) sulphate pentahydrate a chemical or physical change?

Is removing the waters of hydration from $\ce{CuSO4 * 5H2O}$ a chemical or physical change? Sorry for the trivial question. I get varying answers across the net.
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2answers
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Why does sodium polyacrylate solidify, on addition of water?

Sodium polyacrylate is a white powder with a characteristic odor. But when we add water to this powder, instead of forming an aqueous solution, it instantaneously solidifies and forms more amount of ...
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Which half cell equation do you switch when calculating E° cell?

Given the following standard potentials calculate the overall $E^\circ_\mathrm{cell}$: $$ \begin{align} \ce{Pb(SO4)(s) + 2 e- &→ Pb(s) +SO4^2-(aq)} &\quad E^\circ &= \pu{-0.356 V} \\ ...
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Sodium Sulfate vs Sodium Sulfite

I recently took a test and one of the questions was: Which procedures will allow a student to differentiate between solid sodium sulfate and solid sodium sulfite? I. Make solutions of each ...
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1answer
40 views

Change in H+ ion concentration of water on boiling [closed]

I know that on boiling water, pH scale decreases but water remains neutral. At 100°C the pH=6.14 is neutral. And at this temperature also, the H+ ion concentration and OH- ion concentration are equal....
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1answer
97 views

Reason for shorter bond between sulphur and oxygen?

I recently came across this sentence in my textbook “the bonds between sulphur and oxygen in oxides of sulphur (SO2 and SO3 ) are much shorter than might be expected for a single bond” SO3 I feel ...
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2answers
860 views

Relative acidity of aqueous LiF, SnCl2, and YCl3

Which one of the following salts make the highest and lowest pH when dissolved in water? $$\ce{LiF, SnCl2, YCl3}$$ My approach was : considering the corresponding aqua acids, the order of acidity ...
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1answer
5k views

How dangerous is cobalt(II) chloride used in silica gel balls?

I was looking up silica gel beads on Wikipedia and noticed that some (and from experience most) are doped with a colouring agent to indicate that they have absorbed all that they can. The Wikipedia ...
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1answer
391 views

Is there any difference between negative electron gain enthalpy and electron affinity?

According to electron affinity, it is the amount of energy "released" during the addition of an electron in the valence shell of an isolated gaseous atom, and its sign convention is opposite to that ...
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1answer
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Electrolysis - What is the basis for the discharge rules?

At the cathode, the one that is discharged is the less reactive one (compared to hydrogen) so why at the anode is the one that’s discharged more reactive (less stable) ?
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1answer
42 views

How do I get irreducible representations?

I'm currently trying to do a problem where it asks me to "show that the irreducible representations spanned by the atomic x-, y-, and z- coordinates is independent of the choice of local coordinate ...
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1answer
46 views

Why does monoammonium phosphate (MAP) have 52% of phosphorus (P₂O₅)?

The formula of monoammonium phosphate (MAP) is $\ce{NH4H2PO4}$. Manufacturers say that MAP has 10% of nitrogen (N) and 52% of phosphorus (P). However, its molecular mass is 115 u and the atomic mass ...
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0answers
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Ionisation energies of Carbon and Boron

The first ionisation energy of Carbon atom is greater than that of Boron atom whereas, the reverse is true for the second ionisation energy. In order to explain the above statement I considered the ...
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2answers
57 views

Is [Co(NH₃)₄Cl₂]Cl paramagnetic or diamagnetic?

$\ce{NH3}$ is known to be a strong field ligand, while $\ce{Cl}$ is known to be a weak field ligand. Is $\ce{[Co(NH3)4Cl2]Cl}$ a high spin complex or a low spin complex? I assumed this to be a high ...
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9answers
8k views

Would it be possible to destroy gold?

I'm a writer. I have a scenario in which a sizable amount of gold needs to be rendered unusable, preferably completely destroyed. I know an acid like aqua regia is able to dissolve gold, but would ...
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1answer
48 views

Why is the Van der Waals constant of water lesser than benzene?

Van Der Waals constant of water and benzene ($a$) are $5.537$ and $18.82$ respectively. I have read that the value of Van Der Waals constant indicates the extent of attractive forces. By this, ...
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Preparation of Copper (II) Sulfate Pentahydrate Solution

how would you make a solution of Copper (II) Sulfate Pentahydrate to achieve 150, 200, 250 and 300 mgL−1 concentration of copper? I do not have the anhydrous version of the solute. Also, when I ...