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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Equilibrium constant for the thermal dissociation of phosphorus pentachloride [closed]

Thermal decomposition of $\ce{PCl5}$ is studied in a closed vessel. Partial pressure of $\ce{PCl5}$ in gaseous equilibrium mixture is $\pu{1 atm}.$ $\pu{50 \%}$ $\ce{PCl5}$ dissociates. Find ...
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Are clathrates and interstitial compounds the same thing?

In the book$\ce{^{[1]}}$, it's given that clathrates are compounds in which gases are entrapped within cavities of crystal lattices of certain organic or inorganic compounds. Interstitial compounds ...
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52 views

Cation-anion radius ratio of manganese difluoride

How to determine the cation-anion radius ratio for $\ce{MnF2}?$ I tried to calculate the $r_\mathrm{c}/r_\mathrm{a}$ ratio using the relationships: $$2r_\mathrm{c} = c$$ and $$(2r_\mathrm{c} + 4r_\...
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Comparing Electron affinity and electron gain enthalpy at 0 K

In my book it is given that first electron gain enthalpy is greater than second for elements. Should we compare the magnitudes in such cases or the actual numbers with signs? Does the same comparision ...
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40 views

Why is it not practical for insoluble salts to be prepared from other insoluble salts? [closed]

My textbook says that it is not practically feasible to make insoluble salts (say PbSO4) from other insoluble salts (say PbO), without explicitly mentioning the reason for the same. My guess is: if ...
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Spacing between adjacent planes of a given set in a simple cubic crystal

Today I learned about Miller indices in a cubic crystal, and I learned that adjacent planes $(hkl)$ in a simple cubic crystal are spaced a distance $d_{hkl}$ from each other, with $d_{hkl}$ given by: ...
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264 views

What is the difference between cyanato, cyanido and cyano? When should i use which? [closed]

I understand that cyanido is the newly adopted naming in place of cyano but what is cyanato? Can anyone please give examples to illustrate the difference?
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45 views

Does calcium nitrate decahydrate dehydrate or decompose upon heating to 100 degrees Celsius? [closed]

Consider a sample of $\ce{Ca(NO3)2.10H2O}$. To remove water, I need to heat it to $\pu{100 ^\circ C},$ but will this high temperature decompose it or will I get the anhydrous salt?
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326 views

What is the relation between volume strength and normality of H2O2? [closed]

I have been told that: $$\text{equivalent weight of }\ce{H2O2} =\text{molecular weight of } \ce{H2O2}$$ as it's $n$-factor is $1$ (from balanced equation). But in my book it's given that: ...
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Increasing temperature in system of dynamic equilibrium

According to the article Summary of Le Chatelier's Principle on dynamicscience.com.au, for the process $$\ce{N2(g) + 3 H2(g) <=> 2 NH3(g)}\quad ΔH = \pu{-92 kJ/mol}$$ the forward reaction is ...
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Why is the cathode of a lithium-ion battery metallic, which is the opposite of most other batteries? [closed]

In most types of batteries, primary and secondary, the metallic electrode is the anode, and a non-metal acts as cathode. Or a pure metal is the anode, and the cathode is a metal oxide. Why is the ...
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Obtaining mercury from mercury(II) nitrate

I was thinking about obtaining mercury from mercury(II) nitrate. Is it possible? I've tried putting chunks of Fe into it, I've got the logic from the voltaic table (where Fe is on the left side of Hg, ...
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Why does the emission wavelength of sodium appear to be an exception despite the trend for ionisation enthalpies among alkali metals?

The wavelengths for emissions in the visible region for Group 1 elements is as follows: $$ \begin{array}{lc} \hline \text{Element} & λ/\pu{nm} \\ \hline \ce{Li} & 670.8 \\ \ce{Na} & 589.2 ...
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How to know which reduction and oxidation reactions occurred?

We just had a lab experiment on galvanic cells and we used 0.5 M and 1 M iron(III) nitrate solution at the anode (iron electrode) and 1 M and 0.5 M copper(II) nitrate solution at the cathode (copper ...
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243 views

How do I solve this problem on mass balance from blast furnace iron making?

Question An ironmaking blast furnace produces hot metal of the composition: $\pu{93.6\%}$ $\ce{Fe},$ $\pu{2.1\%}$ $\ce{Si},$ $\pu{3.6\%}$ $\ce{C},$ $\pu{0.7\%}$ $\ce{Mn}.$ The composition of the ...
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546 views

Why the formation of PH4+ is difficult compared to NH4+?

My textbook asks this as an objective question. What I had in mind was that the lone pair on phosporous was more distributed as compared to nitrogen(since nitrogen is more electronegative and smaller ...
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Why doesn't the expermintal molar solubility match the one calculated by the Ksp value?

For $\ce{HgCl2}$ ($M = \pu{271.52 g mol-1}$), the reported $K_\mathrm{sp}$ value is $10^{-15.69}$. This means that the calculated molar solubility of $\ce{HgCl2}$ in water is $(10^{-15.69}/4)^{1/3}\...
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258 views

Calculating bond dissociation enthalpy of F-F bond

$$\ce{N2 + 3 F2 -> 2 NF3} \quad ΔH = \pu{-263 kJ mol-1}$$ The bond dissociation enthalpies of the nitrogen triple bond and nitrogen–flourine bond are $\pu{946 kJ mol-1}$ and $\pu{272 kJ mol-1}....
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Br- and I- ions give layer test, but Cl- ion doesn't. Why? [closed]

One of the questions I found in an NCERT book. Interestingly I could not find the answer anywhere on the internet. Hence, stack exchange.
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170 views

Molar conductivity of transition metal complexes solutions [closed]

Which of the following has the highest molar conductivity? (A) Diaminedichloroplatinum(I) (B) Tetraamminedichlorocobalt(III) chloride (C) Potassium hexacyanoferrate(II) (D) Hexaaquochromium(...
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606 views

What kind of isomerism does Ni(PPh3)2Cl2 have and what is their IUPAC name? [duplicate]

I know that there are 2 isomers that $\ce{Ni(PPh3)2Cl2}$ have and they exist in equilibrium. I am tempted to name them cis- and trans- but it does not sound right.
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How do I calculate the proportion of respective conjugates of one base mixed with several acids (and/or conversely) at different temperatures? [closed]

How do I calculate the proportion of respective conjugates of one base mixed with several acids (and/or conversely) at different temperatures, and is there a free software tool that would allow me to ...
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102 views

What should be the molarity of HCl and H2SO4 acid so that they can be considered safe to touch? [closed]

I know $\ce{HCl}$ and $\ce{H2SO4}$ acid of concentration 17 M is dangerous and corrosive, but I wonder can we dilute these acids to the extent that they become safe to touch? If yes, then what should ...
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When a solution is diluted, the number of moles of the solute decreases. what would happen to the molarity? [closed]

When a solution is diluted, the number of moles of the solute decreases, so the molarity decreases??
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171 views

Observations when mixing potassium Triiodide and Sodium thiosulfate [closed]

I have a reaction equation, it's all balanced but I don't understand what the physical change is. It is as follows: $$\ce{2Na2S2O3 + KI3 \to 2Na2S4O6 + 2NaI + KI}$$ It was used to prove if $\ce{...
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147 views

Balancing redox equation with oxygen on both sides?

The problem is to balance this equation in an acidic medium. $$\ce{As2O3 (s) + NO3- (aq) -> H3AsO4 (aq) + N2O3 (aq) }$$ However, I am getting stuck balancing the oxygens after dividing them ...
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Can tin(IV) sulfide be synthesized from tin(II) chloride via oxidation with sulfite in acidic media? [closed]

Will the following reaction occur? $$\ce{2Na2SO3 + 6SnCl2 + 12HCl → 4NaCl + 5SnCl4 + SnS2 + 6H2O}$$ I'm going to synthesizing $\ce{SnS}$ and $\ce{SnS2}$ NP's, but our supply is runned out and ...
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572 views

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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372 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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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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Influence of pH on precipitate crystallite sizes?

It's normally assumed that a higher pH of solution would slow nucleation rates and hence lead to larger crystal formation. I've found literature that it is due to solid-liquid inter-facial tension. ...
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135 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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864 views

What alkali and alkaline earth metal oxides will turn moist red litmus blue and finally white? [closed]

How many of the following will turn moist red litmus blue and finally white? $\ce{Li2O}$, $\ce{KO3}$, $\ce{RbO2}$, $\ce{Cs2O2}$, $\ce{BeO}$, $\ce{MgO}$, $\ce{BaO2}$, $\ce{SrO}$. Since bleach ...
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How Can I Induce Corrosion Electrochemically?

I'm very interested in measuring corrosion in metal alloys, particularly in salt solutions. I understand metals corrode over time, however, I was wondering if it's possible to electrochemically "speed ...
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260 views

Equilibrium constant from mole ratio

Chapter 4, problem 13 from the Chemical Priciples [1, p. 170]: Equilibrium concentrations Experiments have shown that at $\pu{60 °C}$ and $\pu{1 atm}$ total pressure, the equilibrium ratio of $...
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What does it mean that an electron quantum numbers are n1= 4 - l1?

I'm trying to solve some exercises from the 2017 IChO, and the problem 6-A1 states that in first ionization, an electron with the quantum numbers $n_1 = 4 - l_1$ is removed. Now, I've never seen ...
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69 views

Lead's affinity for oxygen in the cupellation refining process

My inorganic textbook says Cupellation is a process, where crude gold is taken in a small bowl called cupell and melted in the presence of air. Due to high oxygen affinity of Pb, it is converted to ...
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Maximum metal-metal distance for antiferromagnetic coupling

Imagine a transition metal complex with multiple open-shell transition metal cations. If the metals are relatively close in distance, it is possible that antiferromagnetic coupling will occur between ...
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Substances - A Macroscopic Concept

Does the term “substance” refer to any sample of matter that is tangible? In other words is “substance” a macroscopic concept or can we also refer to individual particles such as atoms, molecules, etc....
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374 views

Why are reactions with higher activation energy more sensitive to temperature?

In the above picture it is stated clearly, with an example, that the more the Ea of a rxn the more it's sensitive to temperature, and hence even a small change in temperature in a reaction with high ...
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402 views

What should be the reaction between lead oxide and dilute sulfuric acid?

I know for a fact that dilute $\ce{H2SO4}$ is a non-oxidizing acid which makes it a reducing agent. I also know for a fact that $\ce{PbO2}$ is a strong oxidizing agent. So, I thought Redox reaction ...
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269 views

The test of metal hydroxides and metal oxides

Is testing metal oxide different from testing metal hydroxide using a litmus paper?
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Aluminum and aluminum oxide

I have a new grain mill that I am hesitant to use because the rollers are anodized aluminum. As I understand it the anodized aluminum is actually aluminum oxide and supposedly non-toxic. I realize ...
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Sn + HNO3: When will the metastannic acid H2SnO3 appear?

I am dissolving tin in nitric acid. What reactions will take place depending on the conentration of $\rm{HNO}_3$ and temperature? Particularly, I am interested when the metastannic acid $\rm{H_2SnO_3}...
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85 views

How does a molecule find the lowest energy state? [closed]

I understand that in a crystal lattice the molecule will tend towards the structure that is the lowest in energy (fcc, hcp, ccp, etc.). How does the molecule find these lowest energy states? Is it ...
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2answers
276 views

How do you handle manganese nitrate hexahydrate?

So I wanna do an experiment using manganese nitrate and I bought manganese (II) nitrate hexahydrate $\ce{Mn(NO3)2.6H2O}$. But when I received it, it was kinda watery already (most part is still ...
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1k views

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

Electron affinity is the amount of energy "released" during the addition of an electron in the valence shell of an isolated gaseous atom. The sign convention is opposite to that of thermodynamics ...
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68 views

Chemical equilibrium constant problem

In a equilibrium reaction $\ce{CO {(g)} + H2O {(g)} <=> CO2 {(g)} + H2 {(g)}}$, initial concentrations of $\ce{CO}$ and H2O are equal and are 0.3 mol/dm3. What is the equilibrium constant of ...
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787 views

Formula of Manganese (IV) Ion

When determining the formula of manganese (IV) oxide, since it’s made up of $\ce{Mn^4+}$ and $\ce{O^2-}$ ions, why is the formula $\ce{MnO2}$ and not $\ce{Mn2O4}$? Any help would be greatly ...
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What is the pH of starch?

We need to identify an unknown for a chemistry lab. It's either starch or zinc sulfate. We know that zinc sulfate is acidic, but what is the pH of starch?

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