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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Second Ionisation Energy in d Block elements

The second ionisation energy is expected to be highest for element with atomic number: 22 24 25 30 I had expected the answer to be option 2 because the second electron has to be ...
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372 views

Why do bicarbonates tend to be more soluble in water than carbonates, for Group 1 and Group 2 elements?

In Group 1 and Group 2, it is usually found that bicarbonates tend to be more soluble in water than carbonates. For example: $\ce{NaHCO3}$ has higher solubility than $\ce{Na2CO3}$ As most of the ...
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177 views

Assignment of the 13C NMR spectrum of 1-(ferrocenyl)ethanol

The molecule in question has the following structure: (source: sigmaaldrich.com) The 13C NMR is given below: My assignments are: 23.700 ppm, -CH3 65.569 ppm, CH adjacent to the -OH 66.138/66.183 ppm;...
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62 views

Is it possible to produce hydrogen sulfide with tap water and activated carbon or CuZn?

Please note I'm a bit out of my depth with chemistry. The situation: I have a KDF/GAC water filter that defies logic and releases $\ce{H2S}$ (assuming it by smell/taste) in the water after filtration....
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72 views

Use of the box method to determine lowest term symbol for lanthanides but not iron

I am trying to compare the predicted magnetic moment for Fe(CN)6 using the spin-only formula magnetic moment = $\sqrt{4S(S+1) + L(L+1)}$. However, if I use the box method for Fe(CN)6 to predict the ...
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145 views

How to rationalize the colour change of the thermochromic bis(diethyl-ammonium) tetrachloridocuprate(II) complex

The colour of the compound changes from deep green/green-blue to yellow upon raising the temperature. I'm trying to rationalise this by using the d-orbital splitting, but I've got myself in a logic ...
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592 views

Why is Cr+ unstable?

We know that half-filled and fully filled orbitals are highly stable. In ground state $\ce{Cr}$ has a $\ce{3d^5\! 4s^1}$ configuration. Therefore, the elctronic configuration of $\ce{Cr+}$ should have ...
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26 views

Potentiometric determination of fluoride

We did an experiment of potentiometric determination of fluoride ions. In several beakers we added several concentrations of NaF solutions and then we added water. We calculated with the electrode the ...
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79 views

Dissolution of hydrogen sulphide gas in water, and its reaction with cement

INChO 2016 problem 1.8 Each Problem in this question paper is like a comprehension, whose each subpart picks up where the previous left. This makes reading the previous subparts nearly mandatory for ...
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486 views

Solubility of Calcium Oxalate in Aqueous Alcohol?

In searching through the literature for the solubility of calcium oxalate, I came across this post https://www.researchgate.net/post/Are_there_any_organic_inorganic_solvents_for_dissolving_Ca-oxalate ...
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224 views

Why does CO2 only exist in gaseous and solid state under STP/SATP?

Why does carbon dioxide only exist in gas and solid state under STP/SATP conditions? $\ce{CO2}$ pressurized to $\pu{5.1 atm}$ can exist in all 3 states: solid, gas, and liquid. However, why couldn't ...
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489 views

How do we calculate the partition coefficient (including titration)

In a separating funnel we add $\pu{25.0 mL}$ of $\pu{8.5 M}$ $\ce{HCl}$ solution. We also add $\pu{25.0 mL}$ of a tributyl phosphate solution. We shake the funnel for 1 minute and then after the two ...
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417 views

The function of sulfuric acid in a reaction involving halide ions

The purpose of the following reactions is to make halogen gas: \begin{align} \ce{2 NaCl (s) + MnO2 (s) + \boxed{\ce{2 H2SO4 (l)}} &-> Na2SO4 (s) + MnSO4 (s) + 2 H2O + Cl2 (g)} \\ \ce{10 KI (...
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Hybridisation in phosphorus allotropes

The white phosphorus has a tetrahedral structure, like this: [Image source: Wikipedia] The red phosphorus, on the other hand, has a polymeric structure: [Image source: google images] Then what ...
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Moles of Sodium Peroxoborate

The question involves the addition of $\pu{0.15 g}$ of an already prepared sample of sodium peroxoborate which is added to $\pu{100 mL}$ of $\pu{1 M}$ $\ce{H2SO4}$ and $\pu{2 g}$ of $\ce{KI}$. The ...
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290 views

Why is Lithium Fluoride much safer than Sodium Fluoride

I've looked at the MSDS of Lithium Fluoride and Sodium Fluoride. It really seems that Lithium Fluoride is much safer to work with. Why is that, if both are in the Alkali Group?
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406 views

Solubitity of FeS

I have some questions related to a problem of multiple equilibria and solubility. I have to calculate the solubility of FeS in pure water considering that the second stage of hydrolisis of $\ce{S^2-}$,...
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103 views

Is it true that un-dissociated HCl exists in dilute hydrochloric acid?

My book says that the equilibrium constant for $\ce{HCl + H_2O}$ is so high that the reaction goes to completion. But that does not make sense since the existence of an equilibrium constant for this ...
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168 views

Simulated Body fluid recipe

I'm working on preparing SBF in my school's lab however a couple of components are missing which are $\ce{NaHCO3}$ (0.350 g) and $\ce{K2HPO4}$ (0.228 g) . Is it possible to replace these components ...
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193 views

Aluminium etching

I'm trying to etch a very fine pitch ($\pu{0.5 mm}$) aluminium stencil for use with SMT printed circuit board making. I've done some reading on the topic and found that the safest way probably is to ...
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61 views

Corrosion issue at large DC current

I'm no expert in chemistry, but I know that corrosion can cause great problems in systems. I'm working on a prototype, and trying to figure out if corrosion will cause issues. The setup Imagine the ...
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227 views

Buffer (buffer capacity)

I know that there already exist multiple questions concerning buffers and buffer capacities, but I would nevertheless like to clarify two things with your help: Adding to a buffer $n$ moles of an ...
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78 views

Liquid to gas phase exothermic hydrolysis reaction examples

I am working as a petroleum engineer and most of our crude oils are heavy oils (very dense). In reservoir, I want to start an exothermic liquid to gas phase hydrolysis reaction. I am planning to ...
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70 views

Why does more mass not mean more yield?

I have a very vague knowledge of thermodynamics, but let's take a reversible reaction: $$\ce{CaCO3 (s) <=> CaO(s) + CO2(g)}$$ Now if we increase the mass of the calcium carbonate, I ...
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33 views

Boron nitride polymerization with silicon based molecules

Since boron nitride is similar to carbon hexagonal structures and silicon is a main component of inorganic polymers. Is it possible to make it from a polymer under certain conditions, if so what ...
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28 views

Deliquescence database

I am looking for a database or printed document providing the RH0 (relative humidity above which deliquescence will occur) for inorganic salts. I've looked everywhere on the internet can find nothing.
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278 views

How do the silicon-hydrogen bonds in polydimethylsiloxane react with a H2PtCl6 catalyst

How does $\ce{H2PtCl6}$ react with $\ce{Si-H}$ to give $\ce{[PtCl4]2-}$? I know $\ce{H2PtCl6 -> 2H+ + [PtCl6]2-}$ but I'm not sure what is next. This question comes from this laboratory ...
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894 views

Solubility of Aluminium Halides by Fajans rule

According to Fajan's rule polarizability of anion is directly related to the size and hence the covalent character would be more. Now going by this definition aluminium chloride having greater ...
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468 views

Production of ozone from oxygen and Le Chatelier's principle

My NCERT textbooks says as follows: Since the formation of ozone from oxygen is an endothermic process, it is necessary to use a silent electrical discharge in its preparation to prevent its ...
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27 views

Thermal decomposition results: repeatable in ordinary temperatures?

In thermal decomposition studies where very high temperatures are used (see below for four reactions and their respective temperatures, coming from one paper), can I directly relate these ...
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129 views

NiO and ZnO electrical conductivity with oxygen pressure

NiO is a Mott-Hubbard insulator and increasing oxygen concentration leads to anion excess and oxidation of Nickel so electron hopping is more favourable so electron repulsion is reduced and it becomes ...
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123 views

Silanization of glass cover slips

I was trying to silanize the glass coverslips using a protocol mentioned in some papers that say to make up a solution of 595µl N-trimethoxysilylpropyl-N,N,N-trimethylammonium chloride (TCMP-TAC) and ...
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65 views

Why are oxidation states such a fundamental quantity for elements?

Why is it that there are fixed oxidation states for most elements out there, with no to very rare exceptions? I was taught that oxidation state is a totally artificial concept we have invented for ...
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274 views

Problem in Colour in Cerium (IV)Sulphate due to charge transfer

My text says that $\ce{Ce(SO4)2}$ is coloured due to charge transfer spectra. It also gives other examples such as $\ce{KMnO_4}$ and $\ce{K_2Cr_2O_7}$, to which I agree but when I read the conditions ...
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1k views

FeCl3 to [FeCl4]-

A 0.1 M solution of iron(III) chloride in $\ce{POCl3}$ is red and turns yellow on dilution. Titration of red $\ce{FeCl3/POCl3}$ solution with colourless $\ce{[Et4N]+Cl^{-}/POCl3}$ solution causes the ...
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73 views

POMs catalysis of benzyl alcohol oxidation, why Ni is the best cation with POM for that catalysis?

Why is nickel the optimal cation for benzyl alcohol oxidation with POMs and hydrogen peroxide? In this article (Chinese Journal of Chemistry, Volume 30, Issue 2, 2012), they came to a conclusion that ...
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88 views

Why do Cp2Mg and NaCp complexes turn pink when oxidized?

I am just wondering why the complexes sodium cyclopentadienide ($\ce{NaCp}$) and cyclopentadienyl magnesium ($\ce{Cp2Mg}$) turn pink when oxidized? Where does the pink color come from?
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283 views

Substituting Ulexite

I'm working on ceramic glaze chemistry. One ingredient I don't have, but want to substitute is ulexite: $$\ce{NaCaB5O6(OH)6.5H2O}$$ I have borax, calcium borate, and calcium silicate: $$\ce{NaB4O7 ...
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951 views

Why does copper(II) sulfate react with ammonia?

We've done preparation of Tetraamminecopper(II) sulphate $\ce{[Cu(NH_3)_4(H_2O)_n]SO_4}$ using copper sulphate and 50% ammonia solution. Initially, a pale blue color of $\ce{Cu(OH)_2}$ appeared with ...
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63 views

Seeking an explanation of synthetic marcasite

At least one widely available commercial product is called 'synthetic marcasite,' and perhaps two or more. The most prominent is dark gray 'synthetic marcasite' for cheap jewelry. Possibly different ...
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Lanthanide bond lengths and dissociation

Due to lanthanide contraction, covalent character increases and ionic character decreases in lanthanides. Since a covalent bond is weaker than an ionic bond, $\ce{Lu(OH)3}$ should dissociate more ...
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46 views

Why are there so many reactions for the discharge of LiCoO2?

I've just managed to understand a bit the meaning of having the notation of 0.5 in a molecular formula, when I found a set of multiple notations for the same discharge process that started to confuse ...
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273 views

Fast and complete ways to remove chloride from solution (sub ppb levels)

Main question: We are trying to reduce the chloride concentration in a solution to sub-ppb levels. I have to dissect a fruit fly in this solution so I am interested in removing any chloride that is ...
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5k views

Why can phosphorus have 5 bonds while nitrogen cannot?

Phosphorus can form 5 bonds like in the case of phosphate. While nitrogen is known to make a maximum of 4 bonds (3 covalent, 1 dative covalent). But why is this so? Is it because nitrogen doesn't ...
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427 views

Why do osmium and iridium have the most oxidation states of all the elements?

Both osmium and iridium have 12 oxidation states. Indeed, iridium has the highest oxidation state of all elements at +9. see https://en.wikipedia.org/wiki/List_of_oxidation_states_of_the_elements I'...
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Triiodide ion gravimetric analysis Reaction Equation

Last week I did a gravimetric analysis from the following reaction. $\ce{AgNO3 + (CH3)4N+I3- -> AgI(s) + (CH3)4N+NO3- + I2}$ The objective was to identify if my reactant was triiodide or ...
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57 views

How can we get the pure mass of an unclean metal?

So I'm facing a small chemistry problem that I can't find a way to solve. I'm not looking for answers, I'm just looking for how can I approach this problem. The problem is as follows : We put 5 ...
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63 views

electron affinities of Be and Ca

I have found in the textbook that Be has negative electron affinity while Ca has positive why? how can I compare the electron affinity values of these two.?
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416 views

Water-gas shift reaction without catalysts

I'm designing an experimental gas generator. The details are not really important here, but I want to convert a mixture of carbon monoxide, hydrogen and $\ce{H2O}$ gas to a safer form. I know the ...
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63 views

Super atoms and their orbitals

I was reading a science magazine the other day when I came across an article on superatoms. I am now wondering if these structures form their 'superorbitals' in a similar way to the pi rings in ...

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