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.

Filter by
Sorted by
Tagged with
-1
votes
1answer
47 views

Reaction between sodium hydroxide and silicon dioxide [duplicate]

I was trying to make sodium silicate according to the following reaction: $\ce{SiO2 + 2NaOH -> Na2SiO3 + H2O}$ I used colloidal silica available as an intestinal adsorbent since reaction with ...
0
votes
1answer
148 views

Activation of Grignard reagent

For activating Grignard reagents, iodine or 1,2-dibromoethane are usually added, and these lead to the formation of $\ce{MgI2}$ or $\ce{MgBr2}$ respectively . Why can these $\ce{MgI2}$ and $\ce{MgBr2}$...
0
votes
1answer
57 views

Reaction between sodium hydroxide and aluminium oxide [closed]

I am a 10th grade student. Is it possible to know the reason behind the formation of sodium aluminate when sodium hydroxide and aluminum oxide reacts. Is there an intuitive reason for this other than ...
1
vote
0answers
104 views

Why does sulphur exist in two forms in solid state, monoclinic and rhombic? Why in one favoured over another at a certain temperature and pressure?

Both Rhombic and Monoclinic sulphur consist of $S_8$ molecules packed together. Yet the former is more stable below $114^{\circ}C$ at 1 atm and spontaneously converts to monoclinic sulphur above that ...
4
votes
1answer
151 views

On what basis are the prefixes α and β given to black phosphorus?

My textbook says the following about black phosphorus: α black phosphorus is formed when red phosphorus is heated in a sealed tube at $\pu{803 K}$. β black phosphorous is prepared by heating white ...
3
votes
1answer
140 views

The melting and boiling point decreases down the group up to group 14 (not including transition metals), but the trend reverses from group 15. Why?

In groups 1, 2, 13 and 14, the melting and boiling point decreases down the group with a few exceptions. In group 15 the melting/boiling point increases up to Arsenic and then started decreasing. In ...
0
votes
0answers
50 views

Hybridisation of Azide ion

In azide ion, $\ce{N3-}$, the hybridisation is $\mathrm{sp}$ because number of hybrid orbitals = steric number, the central atom $(\ce{N})$ has 6 bonds with other $\ce{N}$ atom, 2 of which are sigma ...
1
vote
2answers
111 views

Extraction of copper from chalcopyrite

During the extraction of copper from chalcopyrite ore, the ore ($\ce{Cu2S.Fe2S3}$) is heated to form $\ce{Cu2S}$ and $\ce{FeS}$. Then during smelting it reacts with $\ce{O2}$ to form $\ce{Cu2O}$. Then ...
5
votes
0answers
148 views

What determines the kind of Bravais lattice structure (body-centred cubic, hexagonal, etc) a transition metal shows?

With the exception of Zn, Hg, Cd and Mn transition metals most transition metals have only one kind of lattice structure at room temperature. Another trend I noticed was that Groups 3 and 4 have ...
0
votes
0answers
12 views

The magnetic moment of copper acetate monohydrate

The value of the magnetic moment of copper acetate monohydrate is very low compared to copper(Ⅱ) complexes. The reason is often explained as antiferromagnetic interaction, but I am not sure the detail....
2
votes
0answers
36 views

Bond Angle of NH3, NCl3 and NBr3 [duplicate]

I have read the other answer on chemistrystackexchange regarding the bond angles of $\ce{NH3}$ and $\ce{NCl3}$. The bond angle of $\ce{NCl3}$ is more than $\ce{NH3}$ due to back bonding between p-...
0
votes
1answer
71 views

Why is the thermal stability of calcium carbonate higher than that of magnesium carbonate even though lattice energy decreases down a group?

The difference in thermal stability of $\ce{CaCO3}$ and $\ce{MgCO3}$ can be explained using Fajans' rules, but why not using the lattice energy method? Why is the thermal stability of $\ce{CaCO3}$ ...
-1
votes
1answer
160 views

How many 4th nearest neighbours are there in an hcp lattice?

My teacher told us that there are 18 4th nearest neighbors in an hcp lattice, at a distance of √3a . I have only been able to identify 12. Can you help me find all the 4th nearest neighbors?
0
votes
0answers
35 views

how do i identify bridging ligands in a given complex

is there any way to identify bridged complexes ? my teacher just drew the complex and I failed to understand why OH should act as a brigding ligand... Im aware carbonyls generally act as bridging ...
1
vote
0answers
36 views

How to prepare an emulsion (compounds in wt%)

I am trying to replicate an experiment to generate microparticles but I found myself confused about how to prepare the ingredients as some need to be weighed and dissolved before and I think the ...
1
vote
2answers
72 views

What gives dilute/conc nitric acid/ conc sulfuric acid their oxidizing property?

I know that dilute sulfuric acid and very dilute nitric acid don't have any oxidizing tendency while dilute/conc $\ce{HNO3}$ and conc $\ce{H2SO4}$ do. Why do these more concentrated acids have this ...
1
vote
0answers
39 views

Differences in activated manganese dioxide synthesis

I've looked into preparations of activated manganese dioxide for some time now, and what confused me is the contrast between the original Attenborough method and some of the alternatives. A solution ...
0
votes
0answers
96 views

How much Na2O (from NaOH) do I add to sodium silicate with a weight ratio of SiO2/Na2O = 2.34 to get the solution to a weight ratio SiO2/Na2O = 1.9?

There is some confusion in industry as sodium silicate is made with NaOH but given a ratio with respect to Na2O (i.e. SiO2/Na2O not SiO2/NaOH). I presume it follows from this equation: 2NaOH -> ...
1
vote
0answers
20 views

Rietveld Refinement: Calculated Intensities far lower than observed for a small selection of miller indices

I'm performing a Rietveld Refinement in excel of an I4/mcm material CeAlO3. The fit is very good for most peaks but on a few, I'm coming up very short on the intensities. Could this be due to a local ...
0
votes
0answers
59 views

Why Potassium Bicarbonate has a higher solubility than Sodium Bicarbonate?

SODIUM BICARBONATE SOLUBILITY Wiki POTASSIUM BICARBONATE SOLUBILITY wiki As According to this answer Now, note that the hydride ion is "hard", having high negative charge density. While ...
1
vote
0answers
66 views

Preparation of Ferrocene

Although many synthesis methods of ferrocene are discussed in literature, I want to know about the black precipitation which occurs when $\ce{FeCl2・4H2O}$ in $\ce{DMSO}$ solution reacts with ...
0
votes
0answers
51 views

How can PCl₆⁻ be formed [duplicate]

So my teacher told me that PCl6- exists, But how? What I don't understand is that Phosphorus has 5 valence electrons hence a covalency of 5 but this doesn't allow for 6 fluorine atoms to bond with ...
2
votes
1answer
240 views

Purpose of using K2O and Al2O3 in Haber's Process

Our text book states use of catalyst such as iron oxide with small amounts of $\ce{K2O}$ and $\ce{Al2O3}$ ( these act as promoters) increases the rate of attainment of equilibrium in Haber's Process. ...
1
vote
1answer
134 views

Ferrous chloride solution coming out purple rather than green?

I've got some steel wool in hydrochloric acid to attempt to make ferrous chloride and the whole solution has turned purple. From everything I've seen it's supposed to be green. I have no idea what's ...
0
votes
0answers
62 views

Endothermic reaction of solid ammonium nitrate

The above process is endothermic by mixing water. When the products (solution containing $\ce{NH4+}$ ions and $\ce{NO3-}$ ions) are heated up again, will it form back $\ce{NH4NO3}$ (solid ammonium ...
2
votes
1answer
73 views

Regarding the oxidation of Manganese(II) ion by Peroxodisulphate ion

The following information is mentioned in my textbook: In the laboratory, a manganese(II) ion salt is oxidized by peroxodisulphate to permanganate. $\ce{2Mn^2+ + 5S_2O_8^2- + 8H2O -> 2MnO4- + ...
3
votes
1answer
91 views

What is the mechanism of temporary bleaching of flowers by SO2 ? Can H2S be used?

There are many claims on the web, explaining that the bleach action of Chlorine gas in discoloring of flower proceeds as follow and require moisture for it : $$\ce{ Cl2 + H2O <=> HOCl + HCl <=...
4
votes
1answer
158 views

The ways to determine if an ionic compound is paramagnetic or not

Find which of $\ce{Na2O2}$ and $\ce{CsO2}$ is paramagnetic. (Adapted from JEE advanced paper-1 2016, q.22) The given solution involves removing the cations and taking the anionic part, i.e. $\ce{O2^2-...
0
votes
0answers
47 views

Why is effective nuclear charge used to explain the periodicity of size of atoms and ions?

Why is effective nuclear charge used for explaining the periodicity of size of atoms and ions, even though radius depends upon many other factors? The size of $\ce{Na+}$ is smaller than that of $\ce{...
0
votes
0answers
91 views

Electron Gain Enthalpy of Noble Gases

Why does He(helium) has less positive electron gain enthalpy than Neon(Ne). The size of atoms increase down the zero group and also the effective nuclear charge increase down the group. Therefore the ...
0
votes
0answers
88 views

Is Copernicium a transition metal?

Zinc, cadmium, mercury and copernicium belong to the group 12 of the periodic table. In my textbook , it is mentioned that zinc, cadmium and mercury are d-block elements, but not transition metals. ...
1
vote
0answers
60 views

What is the basicity order of peroxide, superoxide and hydroxide anions?

My teacher told me superoxide and peroxide anion are more basic than hydroxide but according to Wikipedia Given that the hydroperoxyl radical has a pKa of around 4.8 and and pKa of H2O is Acidity (...
1
vote
0answers
60 views

Regarding the reaction of xenon with fluorine gas

In my textbook, under the topic about xenon-fluorine compounds, the following three equations are mentioned: $\ce{Xe(g) + F_2(g) -> XeF2(s)}$ (Xenon in excess / 2:1 ratio) $\ce{Xe(g) + 2F_2(g) -&...
2
votes
0answers
78 views

Does (BeCl2)n have 3c - 4e- bonding or not?

The title really explains what the issue is here. I would think that it has multicenter bonding akin to $(\ce{BeH2})_n$ polymer because they are pretty much iso-structural (although it shouldn't have $...
-1
votes
1answer
62 views

Fields of Study in Chemistry [closed]

Is there a standard classification scheme for different areas of study and research for chemistry like mathematics has Mathematics Classification Scheme (MSC)?
0
votes
1answer
52 views

Order of Shielding Effect for orbitals

From what I know Shielding effect is the ability of inner electrons to repel outer electrons and reduce the Nuclear charge felt by the outer electrons and this is caused by electron-electron repulsion....
2
votes
1answer
68 views

What is a non-organic analog of a metabolic pathway?

The wikipedia page on the Belousov-Zhabotinsky reaction states the following: The discovery of the phenomenon is credited to Boris Belousov. In 1951, while trying to find the non-organic analog to ...
2
votes
2answers
100 views

Synthesis of active chemical manganese dioxide (CMD) for primary alcohol oxidation

This paper1 uses chemical manganese dioxide (CMD) instead of activated manganese dioxide for mild alcohol oxidation. I'm looking for a route on how to synthesize active CMD. Could this work? $$\ce{...
0
votes
0answers
37 views

What chemistry topics should I learn if I have to do research in microfabrication (ex. photolithography) and ionic liquids (QSPR, synthesis)?

I'm starting a PhD and my research topic involves microfabrication (photolithography, etc.) and also ionic liquids (including QSPR and possibly synthesis). The thing is, I know close to nothing about ...
0
votes
0answers
209 views

Comparing intensity of colour in coordination compounds

I had given an examination recently in which the question asked was: Write the decreasing order for the intensity of color in $\ce{[CoCl4]^{2-}}$, $\ce{[Co(CN)4]^2-}$, $\ce{[Co(H2O)6]^2+}$ What my ...
1
vote
0answers
43 views

Selection of p-orbital(s) when considering sp or sp2 hybridisation

I am considering $z$-axis as the internuclear axis in all cases. When we consider overlap of s and p orbital to form a $\sigma$-bond, the chosen orbital must be p$_z$ orbital for a proper overlap. ...
1
vote
0answers
272 views

What should be the IUPAC name of (NH3)5Co-NH2-Co(NH3)4(H2O)]?

What should be the IUPAC name of $\ce{(NH3)5Co-NH2-Co(NH3)4(H2O)]}$? This is similar to $\ce{[(NH3)5Co-NH2-Co(NH3)5](NO3)5}$, i.e. μ-amido-bis[pentaamminecobalt(III)] nitrate. But the two parts are ...
2
votes
1answer
51 views

In cation analysis, can reagents of higher group precipitate lower group cations?

My teacher told me that Al$^{3+}$ and Zn$^{2+}$ hydroxides are frequently precipitated together and that is why we have to be careful about the concentration of base (NH4OH) added. Does this mean that ...
2
votes
2answers
131 views

Why is beryllium hydroxide amphoteric?

When we react beryllium hydroxide with acid we have an acid base reaction resulting in a salt and a water molecule. Similarly when we react it with base it results in formation of a salt. Most ...
0
votes
0answers
43 views

Sodium hydroxide reaction with manganese dioxide [duplicate]

I came across a website that said it is possible for sodium hydroxide to react with manganese dioxide at temperatures near 0 degrees Celsius. The reaction goes: 2MnO2 + 3NaOH ⇄ MnO(OH) + Na3MnO4 + H2O ...
1
vote
2answers
132 views

How can I make cerium(IV) chloride? [closed]

How can I make CeCl4? I have some ideas but am worried I'm going to mess it up since this is the first time I've worked with lanthanides.
1
vote
1answer
140 views

Why do boron salts impart a characteristic green colour to the flame

In salts of boron it exists as a cation in the B(III) form. It is known to impart green colour in several of its salts like borates, boron triflourides, boric acid etc. If there are no electrons in ...
2
votes
0answers
51 views

Raising melting point of water at STP (using disolved impurities)

Typically, water experiences melting point depression when it is impure. The more impure it is, the lower the melting point, up to a point. I understand you could raise the melting point by increasing ...
7
votes
2answers
826 views

How to separate Cu and Ni from alloy containing different metals such as Al, Cu, Ni, (Zn, Pb, Sn < 5%)?

I have an alloy containing different metals such as Al, Cu, Ni, (Zn, Pb, Sn, Ag, Si in small amount < 5%). How can I separate Cu and Ni from this alloy? I tried to dissolve alloy in sulfuric acid, ...
1
vote
2answers
98 views

Redox reaction between Potassium thiocyanate and iodine

How would you balance the following redox reaction in acidic medium? $$\ce{KSCN + H2O + I2 -> KHSO4 + HI + ICN}$$ In this reaction, it seems the sulfur is being oxidized but iodine is undergoing ...

1 2
3
4 5
88