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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Confused about what to put as the x, y in the picture regarding chemical kinetics

I don’t understand what I should put as the x, y...I drew...is it a stechiometric coefficient or an order number? The pictures seem conflicting to me. Am I getting something wrong?
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How can AuCl3 exist?

The reduction potential for $\ce{Au^3+ + 3e- -> Au}$ is $1.503 \text{ V}$. The reduction potential of $\ce{Cl2 + 2e- -> 2Cl-}$ is $1.36 \text{ V}$. So, the $E^o$ for $\ce{2Au^3+ + 6Cl- -> 2Au ...
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Why are f-f transitions spin forbidden? [closed]

I know that f-f transitions in lanthanides are Laporte and spin forbidden but I don't understand why they are spin forbidden actually... I tried to write it down on a paper but I didn't manage to ...
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How can I prove ascorbic acid degradation with Uv-vis spectroscopy?

I have to prove scientifically why a sodium ascorbate solution in water turns yellowish - reddish over time. I know ascorbic acid is supposed to oxidize into dehydroascorbic acid, and the latter then ...
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What is the effect of the oxidation number of iron on the properties of ferroin complex?

In our labratory expermient, we have determined the isobestic point for iron(III) complexation with ortho-phenanthroline, and we have also studied iron(II) complexation with ortho-phenanthroline by ...
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Why is the trans-effect of nitrile ion (cyanide) weaker than acetonitrile (methyl cyanide) in octahedral chromium complexes?

I was reading a paper which built a series of trans-philicity (a term they coined to indicate both kinetic trans-effect and thermodynamic trans-influence) from extensive calculations. And I found that ...
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Reaction between sodium carbonate and hydrochloric acid

The 2 steps to the reaction between $\ce{Na2CO3}$ and $\ce{HCl}$ are: $\ce{Na2CO3 + HCl -> NaCl + NaHCO3}$ $\ce{NaHCO3 + HCl -> NaCl + CO2 + H2O}$ If $\ce{Na2CO3}$ is in excess and we add ...
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Iodine clock reaction

I have been investigating the iodine-clock reaction for my chemistry project. I have done a great deal of research on the titration of iodate ions, iodide ions and sodium thiosulfate using HCl. But, I ...
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Explanation of the trans-effect (thermodynamic and kinetic) for octahedral transition metal complexes

The thermodynamic trans effect refers to the ground state weakening of the metal-ligand bond in a complex by a ligand trans to it. The kinetic trans effect is the lablisation of a ligand in a complex ...
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Bond angle order of SF2, OF2, HOF

Arrange the following componds in the increasing order of bond angle. $$\ce{HOF,~OF2,~SF2}$$ I know that bond angle of $\ce{SF2}$ will be less than the bond angle of $\ce{OF2}$ because of larger ...
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Why does iodine stay in the aqueous layer of a hexane/salt water mixture?

All the procedures take place in test tubes. There is also stirring in each case. $\ce{NaCl}$ and $\ce{I2}$ are simultaneously added to a water solution. Then we add hexane. There is no reaction ...
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Help balancing reaction between Iron (II) chloride and potassium phosphate

Very rusty with chemistry and looking to review some basics. Came across the following: Iron(II) chloride and potassium phosphate react. Write and balance the molecular, ionic, and net ionic ...
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What qualifies to be considered as a lone pair-lone pair repulsion?

Referring to, NCERT Chemistry Part I, Textbook for Class XI[1]. Here the text puts forward three structures of $\ce{ClF3}$. My teacher said to me that (b) structure is unstable due to lone pair lone ...
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Why are palladium and platinum carbonyls unstable at room temperature?

By palladium and platinum carbonyls, I mean the mononuclear, homoleptic, charge-neutral, binary carbonyl complexes of the form $\ce{M(CO)_n}$ and not any heteroleptic complexes like $\ce{Pd(CO)(PPh3)3}...
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Minimum heating temperature for dehydration of cobalt chloride

I found online several sources that state 100 °C for a rapid dehydration of cobalt chloride in its various forms. I'm wondering if that's a minimum, or would it be possible to dehydrate it at a much ...
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When to consider back bonding and when to not; when will it change hybridisation and when will it not?

This question has been troubling me since my professor taught this concept. Points that she taught: pi back bonding can only happen amongst elements of 2nd and 3rd period. At least one of them needs ...
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What is a correct primitive hexagonal unit cell to describe a monolayer of molybdenum sulfide?

I searched the coordinates or reduced coordinates of primitive cell of mono layer hexagonal $\ce{MoS2}$, but there are lots of different structures and coordination. For example, material project give ...
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Why does calcium phosphate dissolve at low pH

Why does calcium phosphate dissolve at low $\mathrm{pH}$? What makes its solubility $\mathrm{pH}$ dependent? This question arises after reading about the calcium phosphate bridges in casein micelles ...
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Relationship between molar mass and density in solids

In ideal gases, it's pretty clear that 1 mole of gas occupies 22.4 L at STP. By knowing this, it's easy to calculate density given molar mass. However, this isn't true for solids. If I know molar mass ...
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Which has the largest bond angle between water, oxygen difluoride and dichlorine oxide?

Which one out of $\ce{H2O}, \ce{Cl2O}, \&\ \ce{F2O}$ will have largest bond angle? I think it should be $\ce{H2O}$ because oxygen is most electronegative in this case so electrons will be more ...
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Are there any chemicals that combine readily with oxygen?

I am designing an industrial process which can remove oxygen from air. This chemical should combine readily with oxygen in the presence of heat. In particular, I am looking for a chemical with the ...
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Identification of aqueous solutions of sodium hydroxide, sodium acetate and potassium thiocyanate using nickel(II)

I'm very new to chem — taking an intro to chemistry course where we are currently focused on substance identification. I have two substances, both aqueous solutions of either $\ce{NaOH},$ $\ce{KSCN},$ ...
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How do we calculate N factor and why is it useful in calulations?

I don't understand the concept of N factor at all. Why is it important? I know that it is something dependent upon the oxidation number, for example N factor of Na would be 1 since it has oxidation ...
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Why are bridge bonds weaker than terminal bonds and, H-B-H terminal bond angles larger than H-B-H bridging bond angles in diborane? [duplicate]

In Concise Inorganic Chemistry by J.D.Lee (Adapted by Sudarsan Guha, Fourth Edition), on page 83, under the topic "Bridge Bonding" it is given for diborane $(\ce{B2H6}):$ The $d_\ce{B-H}(\...
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What metals aren't dissolved in/attacked by aqua regia?

Aqua regia (Latin: Royal Water) is one of the strongest acids known in Chemistry, and is capable of dissolving gold and platinum. My copy of the Oxford science dictionary goes on to say (under the ...
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Can aqua regia/royal water dissolve lead? [duplicate]

As known aqua regia can't dissolve $\ce{Ag}$ because formation of $\ce{AgCl}$ precipitate. Similarly will aqua regia precipitate $\ce{Pb}$ as $\ce{PbCl2}$? OR It is not possible to observe this ...
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Oxidising power of oxides of 15th group elements [closed]

In case of oxides of 15th group elements in form of $\ce{M2O3}$ ($\ce{M}$ is the 15th group element), does oxidising power of oxides increase or decrease down the group? I tried to check by comparing ...
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Can aqua regia/royal water be produced with sources of chloride and nitrate other than hydrochloric acid and nitric acid?

According to Professor Poliakov and a question on Chemistry Stackexchange here, gold dissolves in aqua regia because the nitrate ion oxidizes the gold into $\ce{Au^3+}$, and the chloride bonds to the ...
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What is the IUPAC Name of [Cr(NH3)5Cl]Cl2.NH3? [duplicate]

What is the IUPAC Name for the complex $\ce{[Cr(NH3)5Cl]Cl2.NH3}$? I can't even find it through the internet and also by employing a find in "IUPAC's Red Book".
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Why is the polarity of the B-N bonds in borazine the reason for its reduced delocalisation of π electrons?

My professor mentioned that borazine is aromatic, but not as much as, say, benzene. The reason he gave for this was that the B-N bonds in borazine, being polar, inhibit resonance. He also mentioned ...
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How are 3 center-4 electron bonds any different from 2 center-2 electron bonds? [closed]

How are the bridge bonds in $\ce{Al2Cl6}$ different from the terminal bonds? We could have just mentioned the bridge bond formed by $\ce{Cl}$ as a coordinate bond. Why introduce this extra concept? I ...
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Finding equilibrium constant for the reaction between non-stoichiometric mix of gaseous components

$$\ce{CH3OH(g) + NOCl(g) <=> CH3ONO(g) + HCl(g)}$$ The volume of the container is $\pu{433 cm^3},$ $T = \pu{50 °C}.$ Methanol was added until the pressure was $\pu{50.1 mbar},$ then $\pu{0.059 g}...
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Do all metal nitrates give nitrogen dioxide on decomposition?

Some metal nitrates decompose to give nitrites: $\ce{2MNO3 -> 2MNO2 + O2}$ whereas some metal nitrates decompose to give $\ce{NO2}$. A possible reaction is $\ce{M(NO3)2 -> MO + NO2 + O2}$ Based ...
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Use of cryolite and fluorspar in electrolytic reduction of pure alumina by Hall-Héroult process

Cryolite $\ce{(Na3AlF6)}$ and fluorspar $\ce{(CaF2)}$ are added to alumina to lower the temperature of the mixture from $\pu{2000 °C}$ to about $\pu{900 °C}$ and also to increase the conductance. But ...
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Why do only some metals make protective oxide layers?

Almost all Alkali metals and Alkaline Earth metals react with air to form their respective oxides, but why does only Magnesium forms a protective oxide layer? What properties of magnesium oxide allow ...
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Ambiguous oxidation state of phosphorus in phosphorous acid

I was doing a question in which we were required to find the oxidation state of $\ce{H3PO3}$. I knew the structure that is: Now, phosphorus being less electronegative than oxygen gets $+2,+1,+1$ ...
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Why is Retention factor for Iodide greater than Bromide?

I did a separation of Bromide and Iodide ions using paper chromatography technique for 0.3% solutions of Bromide and Iodide of sodium. I got the Retention factor equal to ~0.71 for Iodide and ~0.47 ...
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N-N bond length in Dinitrogen Tetroxide

The $\ce{N-N}$ bond length in $\ce{N2O4}$ is $\pu{1.64 Å}$ which is much longer than in the case of Hydrazine $\ce{N2H4}$ $\pu{(1.47 Å)}$. This means that the bond is quite weak. Another unusual case ...
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Lewis structure of dinitrogen trioxide

I have a confusion related to the structure of $\ce{N2O3}.$ I was taught 1 is the correct one, but I believe 2 is better since it has no formal charge on it. Why is 1 correct and 2 wrong?
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Calculate Kc with dissociation degree

If I have the reaction $$\ce{2HI (g) ⇌ H2(g) + I2(g)}$$ and know that at $T = \pu{448 °C}$ the dissociation degree $α = 0.2198,$ how do I calculate $K_c?$ I thought that it would be something like ...
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Comparing acid strength of oxoacids derived from oxides

Acidic strength has been compared before here and here, but the first question is about organic chemistry (and I am talking about inorganic chemistry), and the second does not discuss molecules such ...
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Why does PbI₄ not composed of lead(II), iodide and triiodide?

$\ce{Pb^4+}$ is reduced by $\ce{I-},$ so $\ce{PbI4}$ cannot exist with $\ce{Pb}$ in $+4$ oxidation state. But if I replace three $\ce{I-}$ with $\ce{I3-},$ then we can have $\ce{Pb^2+}$ similarly to ...
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How to find the amount of moles given mass percentage data

A hydrated aluminium sulphate, $\ce{Al2(SO4)3.xH2O}$, contains 8.10% of aluminium by mass. Find the value of x. My attempt: (Assuming 100g sample) Calculate the amount of aluminium using the formula ...
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Why is osmium(VIII) oxide so toxic?

Osmium(VIII) oxide or osmium tetroxide is a volatile chemical compound with the formula of $\ce{OsO4}$. It is highly toxic for supposedly irritating mucous membranes, but I'm not too sure if it is ...
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Why is sulfur hexafluoride more stable than selenium or tellurium hexafluoride?

I was just reading about p Block elements from two different books. Both books say that $\ce{SF6}$ is extremely stable in 16th group due to steric reasons but my question is why is it more stable than ...
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What is the precision of intensity data in XRD measurement?

I made some relative crystallinity measurements on a zeolite (crystalline aluminosilicate). Which is measured for a specific peak area and compared with a reference sample. The XRD of powder patterns ...
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Determining direction of equilibrium

I am having a lot of trouble with this question. We have to determine if $K$ is greater or less than 1. I at first thought the equilibrium would favor the right side because this could have to do with ...
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Determining the mass of sodium sulfate that forms when reacting sulfuric acid with sodium hydroxide

I have come across simple problem in the chemistry book which I cannot solve. The question is below. I would appreciate if you have any solution to this. Question: $3\ \mathrm{g}$ of $\ce{NaOH}$ ...
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Boiling sodium hydroxide in stainless steel cup: Solution turning to a blue color

I boiled highly concentrated sodium hydroxide in a stainless steel cup. This created a blackish layer on the bottom of the cup and turned the colour of the sodium hydroxide solution to blueish. Am I ...

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