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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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Polymer that has aldehyde and carboxylic acid functional group

I'm currently identifying an unknown polymer sample and I found out from raman spectroscopy that it may contain aldehyde and carboxylic acid functional groups (and possibly ketone too). I was looking ...
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Why does the orbital occupying more space around the central atom have higher s character?

Originally I had thought that Bents Rule stated that more electronegative atoms prefer to stay in the axial position. But later I came to know that this works only for Trigonal Bipyramidal Geometry. ...
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Why does ionisation energy to remove electrons from the same subshell increases?

Electrons in the same subshell possesses the same energy. So why does ionisation energy to remove electrons from the same subshell increases? For example, $\mathrm{2s^2}$ has two electrons. Since ...
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what is the crystal compound formula for the ratio of elements 1:2 [on hold]

How do you find the crystal compound formula when the ratio is given. for example, if you have the ratio of compound 1:2, what will be the formula of compound be?
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Why do we use thermal decomposition of ammonium beryllium fluoride to produce beryllium fluoride?

Why do we use thermal decomposition of (NH4)2BeF4 to produce BeF2 rather than use BeO and HF? In my textbook it is written that the thermal decomposition route is more convenient than reaction of its ...
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46 views

Using Roman Numerals to indicate a compound

I don't completely understand it's use. Here's an example I don't understand: Shortly after discussing $\ce{[CuCl4]^2-}$, an exam paper asked a question about copper(II) chloride. I understand that ...
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Why NCl3 and PCl3 gives different product on hydrolysis? [duplicate]

My answer: N and Cl form non polar bond due to similar electronegativity. N doesn't have empty d orbital so hydrolysis takes place with donation of lone pair of N to H-atom of water. PCl3 forms polar ...
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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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Solids to liquids process

Melting point is the critical point at which a solid starts to be transformed into a liquid? Does this mean that the geometric lattice of a solid is broken?
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What exact color does ozone gas have?

This answer to a now closed question says that ozone gas has a "slight blue" color. But there are lots of blue colors: sky blue, ultramarine, phthalo blue, many others — what is closer to the color of ...
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1answer
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Why is the H2O molecule an antigen despite its tiny size and simplicity? [on hold]

I just saw a news article about a woman with Aquagenic Urticaria which basically means she produces antibodies against H2O molecules which causes very bad symptoms if she touches or drinks water. We'...
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1answer
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Stoichiometry of the redox reaction with crystallohydrate [on hold]

Consider the following balanced equation: $\ce{2 Al(s) + 3 CuCl2 . 2 H2O (aq) → 3 Cu (s) + 2 AlCl3 (aq) + 6 H2O (l)}$ If we began the experiment with 0.99 g of Al, according to the ...
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carbon dioxide concentration of water [on hold]

If you let 10L of distilled water sit at atmospheric pressure, how much $\ce{CO2}$ will it contain in ppm when it reached it equilibrium with the air? (Assuming the air contains 350 PPM of $\ce{CO2}$...
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Gibbs Free Energy questions [on hold]

https://nimb.ws/avHnge Gibbs Free Energy questions. Please help.
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40 views

Melting point in hydrocarbons

Checking out the molecular structure and the melting points of various hydrocarbons I concluded: 1)branching increases the melting point of a hydrocarbon molecule 2)symmetry increases the melting ...
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2answers
90 views

A simple question about the direction of a chemical reaction

I do not know much about Chemistry and whatever I knew has become rusty. I have a very simple query. I take a beaker containing pure $\ce{H2SO4}$ solution and immerse a rod of pure $\rm Zn$ into it. ...
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How to deal with coordinate bonds while dealing with formal charges?

When we calculate the formal charge of an atom in a molecule we consider the non-bonding pair as 2 electrons and any covalent bond as 1 electron. Ok then what about dative bonds,how many electrons do ...
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1answer
24 views

Reaction between copper sulfate and iron [closed]

If 1.92g of iron reacted with a solution containing 14.00g of copper sulfate calculate: a. the moles of iron added? b. the number of moles of copper deposited? c. the mass of copper deposited?
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Is cobalt (III) hexaaqua paramagnetic or diamagnetic?

The complex ion $\ce{[Co(H2O)6]^3+}$ has $\ce{Co}$ in the $+3$ oxidation state, meaning it has an electron configuration of $[Ar] 4s^0 3d^6$. Therefore it has 4 unpaired electrons and would be ...
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Sulphur monochloride and selenium

Wondering if adding Selenium powder to Sulphur Monochloride results in Selenium monochloride. Anyone?
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Method to determine the maximum coordination number that can be exhibited by any element

I have read that coordination number depends on size,charge ,and electronic configuration . could anyone explain giving a example how to determine the maximum coordination of any element
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1answer
22 views

Is there any book or text where ionic radius of elements are given?

So my research has me looking for ionic radius characterization. If anyone could post any link or give the name of any book where ionic radius of all elements are given that would be really great?
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Gap in ionic radii

The above picture was shown in a presentation by my prof in inorganic chem as we were discussing ionic radii more in depth (all in pm). These are all isoelectronic radii. Notice the sudden leap in ...
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The acid HA is 4.1 % hydrolyzed in solution. If the concentration of HA in solution is 2.0 M, what is the pH? [closed]

The acid HA is 4.1 hydrolyzed in solution. If the concentration of HA in solution is 2.0 M, what is the pH? a. -.91 b. -.30 c. .30 d. .91 g. 2.77 For this problem i have no idea where to go.. ...
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1answer
40 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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How to determine the number of water ligands attached to Pd in palladium chloride aquacomplex PdClₓ · yH₂O?

Normally this can be achieved using UV-vis: there is a strong absorbance around wavelength 220 nm which varies based on the number of ligands. If the palladium concentration is too high, the solution ...
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1answer
38 views

Important Stoichiometry question, just need formula or help and answer checking [closed]

How many grams of Cobalt(II) chloride $\ce{CoCl2}$ is needed to make $\pu{0.645 L}$ with a concentration of $\pu{1.25 mol\:L^{-1}}$? (the molar mass of anhydrous $\ce{CoCl2}$ is $\pu{129.839 g\: mol^...
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Resistivity of metals [closed]

Well I know the theory which says that the resistivity of a metal is increased with temperature because the vibration of the individual atoms in the lattice become more violent and that resistivity is ...
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0answers
24 views

CO2 IR extinction coefficients near the 15 micrometer band

I have searched multiple times for a spectrum or a table of the gaseous carbon dioxide Lambert-Beer extinction coefficients in the IR Earth thermal region. All I found was absorption spectra. Is ...
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0answers
33 views

How do I make alkaline iodide azide solution without azide? [closed]

I'm trying to do a Winkler titration for my high school depth study. The thing is, I need to source my own chemicals and so far I can buy NaOH and KI, but I can't find sodium azide anywhere. Could ...
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Which of the following has the most number of Atoms [closed]

Which of the following has the most number of Atom? 5 g of lithium, 80 g of Rubidium, 20 g of sodium, or 125 g of the CEsium?
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1answer
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How to convert soluble colorless [HgI₄]²⁻ back to insoluble red HgI₂? [closed]

When a solution contains $\ce{Hg^2+}$ and $\ce{I-}$, depend on the concentration ratio of $\ce{Hg^2+}$ and $\ce{I-}$, the following reactions can happen: $$\ce{Hg^2+ + 2 I- ⟶ \underset{insoluble red ...
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How does this limit the value of boiling points as criteria for determining the purity of liquids? [closed]

If ideal liquids x and y both have a boiling point of 110 C, what will be the boiling point of a mixture of x and y? How does this limit the value of boiling points as criteria for determining the ...
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1answer
32 views

Reactions between Ca(OH)2 and CO2, and Sr(OH)2 and CO2

So I'm doing an investigation, and it involves using supersaturated solutions of Ca(OH)2 and of Sr(OH)2. I notice that there's always a flaky precipitate formed on top. I need to know about the ...
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1answer
38 views

Identifying Lewis acid

What is the Lewis acid on the reactants side? $$\ce{HNO2(aq) + HPO4^{2-}(aq) <=> NO2-(aq) + H2PO4-(aq)}$$ The book says it is the $\ce{H+}$ only, not the whole molecule of the nitrous acid, ...
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2answers
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How does acidifying a compound in qualitative analysis make sure any interrupting compounds get removed?

So I've learnt that acidifying a compound for salt analysis is to remove any basic interference and remove interrupting compounds such as carbonates. How does it remove them or what reaction is taking ...
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ML6 Type Coordinate Complexes - Drawing a Molecular Energy Orbital Diagram

In class we recently discussed how to draw out molecular orbital energy diagrams for compounds such as NH3 (ammonia). Building upon this, we touched on how to construct a molecular energy diagram for ...
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1answer
36 views

Spin-forbidden transition iof bromine

In one of the lectures of my spectroscopy course, the professor claimed that there is a strong absorption band in the UV/Vis spectrum of bromine, associated with a singlet-state to triplet-state ...
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2answers
66 views

Why is phosphorus (v) oxides molecular formula P4O10 and not P2O5

I understand that the name derives from the empirical formula; however, I do not understand why it does not exist as $\ce{P2O5}$. Is there a compound that exists with this as its molecular formula?
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1answer
91 views

Why is fluorine a oxidising agent?

Fluorine has very high charge/mass ratio as it is very small in size, its electron gain enthalpy is very high. Oxidizing agent pulls the electron cloud of the substance being oxidized towards itself, ...
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2answers
58 views

Why can't a weaker acid protonate the conjugate base of a stronger acid?

So I've heard that, supposedly, a weaker acid cannot protonate the conjugate base of a stronger acid to give that stronger acid. For instance, adding ethanoic acid to sodium sulphate will not result ...
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1answer
34 views

Why does sp hybridised orbital have more directional character than p orbital?

It states so in my textbook. But since s orbital is non directional, shouldn't sp hybridized orbital be less directional in character than p orbital?
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Shortcut method to find atomic term symbols ignoring the spin orbit coupling

Is there any shortcut method by which we can find the atomic term symbols ignoring the spin-orbit coupling, i.e. ignoring the values of J. For instance, when writing the d-d transitions for any ...
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1answer
44 views

Hydrate decomposition equation steps

When a hydrate decomposes it loses water molecules in steps. Does each step have a chemical equation? If so is the following equations for decomposition of cupric sulfate hydrate correct? $$ \begin{...
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1answer
49 views

Can I lock up CO2 into silicon carbide? [closed]

Can it be possible to use atmospheric $\ce{CO2}$ in a reaction (or series) with silicon dioxide, both of which are plentiful, to sequester the carbon in a solid and more useful material, silicon ...
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0answers
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How do we get the wave function of Ligand Group Orbitals with the same symmetry as that of the corresponding metal orbitals

In the book Principles of Structure and Reactivity by Huheey, Chapter 14, the author has taken linear combination of ligand orbitals to form ligand group orbitals and then further combination of LGOs(...
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1answer
64 views

Colour of colloids

Why colours of colloidal solutions are different when viewed along different directions? For example Milk appears blue when viewed by reflected light and red when viewed by transmitted light Is it ...
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1answer
42 views

Ammonium considered as metal

Why ammonium ion has very similar properties to the heavier alkali metals and is often considered a close relative? Ammonium is expected to behave as a metal ($\ce{NH4+}$ ions in a sea of electrons) ...
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Qualitative analysis of iron(III) salt

Why will $\ce{Fe^3+}$ give brown ring test? In my textbook it was given that ferric ion gives brown ring too. I am confused, if ferric ion is already present, then what will reduce nitrate ion to ...
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Lewis structure of H3PO2

Here I have shown what I think should be the possible structure. The formal charges are okay and the inert pair effect has also been accounted for as down the group in group 15 +3 oxidation state ...