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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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2answers
58 views

How to know dichromate is being reduced from Cr⁶⁺ to Cr³⁺?

When potassium dichromate is being used as an oxidising agent, it gets reduced from chromium(VI) to chromium(III). Is there any way to know that or calculate that other than being familiar with ...
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Why chemicals bottles (plastic) have paper seals?

I have my film developer and fixer in the plastic bottles, also I have glycerine and propylene glycol. They all have paper seals (in caps) that those chemicals get wet and destroy - they just fell ...
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112 views

Which is more acidic HOF or HOCl?

My attempt to the question: We know that more polar the $\ce{O-H}$ bond, the more acidic is the compound. According to electronegativity, the $\ce{O-H}$ bond of $\ce{HOF}$ should be more polar than $\...
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1answer
54 views

Number of planes with maximum atoms

Number of planes in $\text{SiH$_2$FCl}$ which contain maximum atoms but all must be different? I am interested in the above problem. I predicted the answer to $10$ which indeed is $5\choose 3$ ...
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1answer
98 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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1answer
261 views

What is the hybridization of chromium in chromate and dichromate ions?

I was recently reading about the transition metals and some important compounds of them. I came across a rather interesting diagram in my book... a tetrahedral structure for the chromate ion. The only ...
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24 views

Copper Tetrafluoroborate neutralisation/precipitation to reduce landfill [closed]

I have 25L drums of Copper Tetrafluoroborate waste solution. Can it be neutralised, precipitated in some way, to minimise the amount of waste that goes to landfill? also, landfills prefer solid ...
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50 views

Nessler's Reagent and Lead Acetate Reaction

While performing inorganic salt analyses in the lab, I mistakenly added Nessler's reagent to a solution of lead acetate (instead of ammonium carbonate) in NaOH. A greenish-yellow solution resulted, ...
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1answer
37 views

HPLC Columns For Compounds Not Soluble In Non- Or Low Polar Solvents [closed]

Can someone recommend HPLC columns for compounds which are not soluble in no- or low polar solvents (hexane, isopropanol, toluene, and dichloromethane)?
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1answer
134 views

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}(\text{...
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56 views

Bonding in Sulphur dioxide [duplicate]

In Concise Inorganic Chemistry by J.D.Lee (Adapted by Sudarsan Guha, Fourth Edition), on page 82, under section 3.8 - Types of Covalent Bonds (Sigma and Pi Bonds) it is given (for Sulphur dioxide ...
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Can an alcohol oxidation to ketone happen with hydrogen peroxide? [duplicate]

As far as I know, usually $\ce{CrO3}$ and $\ce{KMnO4}$ are used for this scope, but can other oxidizers such as $\ce{H2O2}$ be used?
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1answer
84 views

Why does the d orbital size decreases on addition of electrons?

In Concise Inorganic Chemistry by JD Lee (4th edition; adapted by Sudarshan Guha), on page 80 under section 3.7 "The Extent of d-orbital Participation in Molecular Bonding" it is given: A second ...
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1answer
55 views

Why is trichloromethane more acidic than trifluoromethane? [duplicate]

In Concise Inorganic Chemistry by JD Lee (4th edition; adapted by Sudarshan Guha), page 78 under the topic "Back Bonding" it is given: $\ce{CHCl3}$ is more acidic than $\ce{CHF3}$ which is ...
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121 views

Why is back bonding not possible in sulfur dichloride?

In Concise Inorganic Chemistry by JD Lee (4th edition; adapted by Sudarshan Guha), page 76 under the topic "Back Bonding" it is given: For $\ce{SCl2}$ the bond angle is 102° since the lone pair of $...
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0answers
69 views

Why are B-O-H and B-O-C angles in B(OH)3 and B(OCH3)3, respectively are higher than normal?

In Concise Inorganic Chemistry by JD Lee (4th edition; adapted by Sudarshan Guha), page 77 under the topic "Back Bonding" it is given: The $\mathrm{2p}\pi$-$\mathrm{2p}\pi$ back bonding in $\ce{B(...
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2answers
633 views

“T” in subscript in formulas

Does a “T” in a formula subscript indicate all possible numbers of atoms? $\ce{FeO_T}$ is the specific one I came across (in the "bulk chemistry" table here: https://sciences.ucf.edu/class/...
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1answer
395 views

Dipole moment in NF3 versus NH3

The usual explanation for the molecular dipole moment of NF$_3$ being smaller than that of NH$_3$, despite the N-F dipole being stronger than the N-H dipole, is that influence of the lone electron ...
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4answers
281 views

How can a neutral atom attract electrons when it's supposed to have zero charge?

A neutral atom is an atom with an equal number of protons and electrons We know the force of attraction between the proton and electron is equal and assuming that: one proton's positive charge ...
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2answers
65 views

Can you give examples for a halide ion reacting with interhalogen compound to give polyhalides?

Interhalogen compounds are formed when two halogens $(\ce{F},$ $\ce{Cl},$ $\ce{Br},$ $\ce{I})$ react together. They are represented by $\ce{XX'_n},$ where $\ce{X}$ is halogen of larger size and $\ce{X'...
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Why is lead's first ionisation enthalpy greater than that of tin?

Using Slater's rule, I found that both lead and tin's $Z_\mathrm{eff}$ for 6p and 5p electrons equal. However, the ionisation energy is different. Is comparing ionisation enthalpy on the basis of $Z_\...
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2answers
69 views

Storage of Halogen [closed]

I learned that we should store Bromine in brown coating glass bottle. But, I heard that halogen liquid is so reactive that it can melt even glass. So, I want to know the practical storage method of ...
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1answer
71 views

Electrons distribution of oxygen atoms in ozone [closed]

While dealing with the Lewis structure for ozone, most of the explanations show the electron distribution around the 3 oxygen atoms with a single and double bond. But if you count the number of ...
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1answer
40 views

Balancing the chemical equation using Oxidation Number Method [closed]

Permanganate ion reacts with bromide ion in basic medium to give manganese dioxide and bromate ion. Write the balanced ionic equation for the reaction. Please balance the equation using the oxidation ...
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3answers
923 views

What does a comma signify in inorganic chemistry?

$\ce{(Ca{,}Co)CO3}$ I have never ever seen this before. What does this mean exactly?
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1answer
67 views

Synthesis of copper selenide

If I react selenium powder with copper chloride powder above the melting point of selenium (221 °C), will I end up with a chunk of copper selenide, with the chlorine given off as gas, or will I lose ...
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22 views

Do any decent thermochemical databases exist? [duplicate]

The more thermochemical properties the better, but specific heat/ specific heat capacity is what I am looking for.
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146 views

Why does the dipole moment order of group 15 hydrides increase down the group?

The order given in my book is $$\ce{NH3} > \ce{SbH3} > \ce{AsH3} > \ce{PH3}$$ Phosphorous is more electronegative than arsenic and antimony. Then shouldn't the dipole moment be more in ...
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0answers
29 views

Determining the composition of basic copper sulfate by titrimetry

A colleague shared an undergraduate level classical gravimetry/titrimetry experiment on determining the stoichiometry of basic copper sulfate. I am looking for a reference for this type of experiment. ...
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Why does ammonia have higher melting point but lower boiling point than HF? [duplicate]

I guess the reason is hydrogen bonding, but shouldn't both the trends be similar in that case?
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1answer
30 views

Exact weights for a chemical reaction og Silver and Nitric Acid [closed]

I'm an amateur analog photographer and want to react Nitric Acid (62%) and silver to Silver nitrate. Silver nitrate is the basis for almost all black and white photography. I'm trying to figure out ...
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1answer
152 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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0answers
22 views

How to extract melanin from human hair [closed]

I am working on a project wherein I am studying various properties of human hair and its utilization..I would like to know method by which we can extract melanin from human hair. Can anyone suggest ...
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0answers
27 views

Measuring change in concentration of hydrogen peroxide

I am conducting an experiment to find the rate constant of the decomposition of hydrogen peroxide, $\ce{H2O2}.$ For this, I was planning on using the integrated rate law: $$\ln(\text{final ...
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0answers
82 views

Calculating ionic strength and pH of a buffer solution [closed]

Im trying to calculate ion strength and pH of solution. Components of the solution: 47 ul of 1000 pmol DNA in Elution Buffer (10 mM Tris-HCl pH 8.5) was bound to 3 ul of 10 µM YoYo1 (flourescent dye) ...
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39 views

Lewis dot structures of carbonate, nitrate and phosphate anions

According to the Lewis dot structure, which of the following anions has more than 4 bond pairs around the central atom? 1) carbonate anion 2) nitrate anion 3) phosphate anion 4) none of ...
2
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1answer
70 views

Coordinate bonds between molecules

For the following question Which molecules react to form a dative/coordinate bond? A. $\ce{CH4}$ and $\ce{NH3}$ B. $\ce{C2H2}$ and $\ce{Cl2}$ C. $\ce{NH3}$ and $\ce{HF}$ D. $\ce{Cl2}$ ...
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1answer
105 views

How does the energy released during a bond formation typically manifest itself on atomic level?

Chemistry newb here. I've been reading about how energy is released when new chemical bonds are formed but it's hard to find info on how that typically manifests itself (besides that it's via heat). ...
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1answer
167 views

Is scandium considered a transition metal?

I have seen so many conflicting answers to this question in various places so I wanted to ask it again. IUPAC defines a transition element as an element whose atom has a partially filled d sub-...
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1answer
134 views

Rechargeable Battery Based on Neutralization Reaction of Acid and Base [closed]

The neutralization reaction, such as $\ce{HCl + NaOH → NaCl + H2O}$, generates heat, which is around $\pu{57.30 kJ/mol}$. Can we use this energy to design a battery? This idea occurs in my mind for a ...
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0answers
14 views

Electron shells and subshells energies [duplicate]

According to what i learned in university, the energy of orbitals increases when the principal quantum number n increases. Also, in a given shell, s orbitals have lower energy than p orbitals which ...
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0answers
31 views

However what is so acidic about CaO and basic(no pun intended) about SiO2 while calculating basicity of slag?

I have seen Basicity to be calculated as $\mathrm{B} = wt\%\:\ce{CaO}/wt\%\:\ce{SiO2}$ particularly in slag bascity/acidity calcuations. Now I do not think that $\ce{CaO}$ is the most basic oxide that ...
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1answer
78 views

Why do we use coke instead of coal in order to reduce FeO as basic reaction in ironmaking process?

Why is coke used as a reducing agent to reduce FeO to produce iron instead of coal.I admit that coke is carbonaceous but what is it that compels us to use coke instead of the naturally available coal?
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n+l rule for first member of lanthanide and actinide series

as we all know that if the value of $n+l$ is same then the orbital with lower value of $n$ will get filled first so in case of first member of lanthanide series the configuration is $(\ce{Xe})\mathrm{...
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2answers
99 views

What is the origin of the Quadratic factor in calculation of XRD peaks?

Whenever we are to calculate the d-spacing(for cubic system) in XRD peaks with reference to Quadratic Factors we do that with the help of the formula $$\frac{1}{d_{hkl}^2}=\frac{h^2+k^2+l^2}{a^2}.$$ ...
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1answer
63 views

How to determine pressure and concentration of carbon dioxide in blood plasma?

A man suffering from untreated diabetes mellitus is admitted to a hospital. Doctors fear that his blood $\mathrm{pH}$ may have dropped because of ketoacidosis. Analysis of his blood reveals that $[\ce{...
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1answer
38 views

How can I prepare two phosphate buffer of different concentrations but give same pH? [closed]

How is it that buffers of different compositions can have the same pH? For example, it is possible to prepare 0.01 M phosphate buffer of pH 7.0 and 0.1 M phosphate buffer of pH 7.0? How? I used ...
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1answer
46 views

How to find the resist in pH change when both are same buffers of same concentration? [closed]

We are given two buffers [a) 0.1 M phosphate buffer of pH 7.7 and (b) 0.1 M phosphate buffer at pH 6.71 . If acid is to be added to the buffers, which of them, will resist the pH changes better I ...
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0answers
41 views

Are Slater’s rule and lanthanide contraction contradictory?

According to most textbook and the Wikipedia page of lanthanide contraction, the phenomenon is due to poor shielding of nuclear charge by 4f electrons. However, the σ value of 4f electrons to 6s is 1....
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1answer
86 views

How can I calculate the equilibrium constant for this reaction?

Silver(II) oxide partially decomposes into solid silver and oxygen gas according to: $$\ce{2 AgO(s) <=> 4 Ag(s) + O2(g)}$$ with enthalpy $H^\circ = \pu{62.0 kJ}$ and entropy $S^\circ = ...