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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24 views

How to evaluate a non-ionized compound activity coefficient? [closed]

I know that the activity coefficient of compound such as $\ce{NaHCO3}$ is greater than unity averaging 1.13 for seawater ionic strengths, but how can we evaluate this value?
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47 views

Why is aluminium used to treat waste after a lab experiment? [closed]

How does adding aluminum metal pieces into a waste beaker help treat solids and liquids in the beaker so you can safely send the solids to a landfill and dispose of the liquids in the sink drain ...
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2k views

What is the order of volatile nature of Group 15 hydrides? [duplicate]

Among NH₃,PH₃, AsH₃, SbH₃ the increasing order of volatility given in my textbook is as follows. NH₃< SbH₃< AsH₃< PH₃ I know that among all these hydrides NH₃ alone is capable of forming ...
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76 views

Will the solubility product constant differ in this case? [closed]

I am considering the solubility product of sodium citrate. I need this value, I do not have it. However, I do know that the solubility product of calcium citrate is (7±2)×10^−14. Is it safe to ...
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1answer
124 views

Obtaining 30% sulfuric acid [closed]

What volume of $10\%$ sulfuric acid solution ($\rho = \pu{1.07 g cm-3}$) do you need to put into $\pu{300 mL}$ $50\%$ of the same acid solution ($\rho = \pu{1.4 g cm-3}$) to get $30\%$ solution? I've ...
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2answers
770 views

Do ferrous sulfite and aluminum sulfite exist?

Source: Concise Chemistry-ICSE (Class X)SELINA PUBLISHERS Pg 207 In this book, it is mentioned that ferrous sulfite and aluminum sulfite does not exist. I even tried searching these on Google but ...
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813 views

Carboxylate salt of Iron

I read somewhere that Fe does not react with formic acid. Because carboxylic acids are very weak. But by searching I found an article about carboxylate on wiki. It mentions about carboxylate metal ...
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1answer
34 views

Confused about excercise with w/w% [closed]

I found super simple excercise which is killing my mind. I should prepare 500 mL 1M HCl. I should make it from 36 w/w% HCl. I do not understand how I can make from less concentrated solution something ...
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1answer
818 views

Would the bond length of boron trifluoride remain the same after electron donation?

Would the bond length of boron trifluoride remain the same after electron donation? My guess is it should be the same, because if $\ce{BF3}$ donates electrons from the low energy occupied orbitals, ...
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2answers
235 views

Oxidation States?

Metals in low Oxidation states are usually reducing agents. Is there any example of a metal in zero Oxidation state acting as an oxidizing agent.
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3k views

Lattice enthalpy of alkaline earth metals [closed]

How lattice enthalpies of alkaline earth metal carbonates is affected on moving down the group?
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4k views

Structure of nitric oxide

These are the two resonating strctures of NO given in my textbook. In the first resonating structure, oxygen is shown to have 9 electrons. How can that be possible since oxygen does not have the third ...
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452 views

Valences of atoms in covalent compound

1 does the valency of an atom in a covalent bond equals the number of bonds it has with the other atoms in that compound? 2 If "yes" then typically to bonds chlorine has in NaCl04 It has a valency ...
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824 views

How could you balance this redox equation involving Cr2O7 2- and H2O

Hi I know that balancing redox equations you first work out the separate half equations first and then combine them however I'm not sure how to balance this one? $$\ce{Cr_2O_7^{2-} + H^+(aq) + e^- \...
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19k views

Is silicon dioxide a polar molecule or not?

Is $\ce{SiO2}$ is a polar molecule or not? The difference in electronegativity between the two atoms is 1.7. I read that $\ce{SiO2}$ doesn't exist as a single molecule in which the silicon atom is ...
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Titration of H3PO4 and H2SO4 with methyl orange and phenolphtalein as indicators

There are some problems I don't understand how they are solved (I have the answer). Since I can't find anything related to these in google, I'm gonna write the problem and the answer here. Problem: ...
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1answer
94 views

The standard for drinking water is 1300 mg/l and the first area has a value of 837 µg

I am trying to figure out the hazard quotient of copper compared to the standard. The standard for drinking water is 1300 mg/l and the first area has a value of 837 µg. How do I convert this? I use ...
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1answer
3k views

Where does the energy in the exothermic reaction of CaCl2 with water come from?

Today I created $1~\mathrm{M}$ aqueous solution of $\ce{CaCl2}$ and realized that the water before the mixture had a temperature of 23.4 Celsius degrees. Then I added the $\ce{CaCl2}$ and the ...
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Is there any proven effect of spraying aerosol on evaporation of water?

Yesterday I was performing extraction of sodium chloride from its saturated solution in water by placing a bowl containing the solution under the hot sun. There wasn't much change in the volume of ...
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0answers
21 views

What is the mutltiplicity of each carbon in Methyl propyl ether? [closed]

For 1H NMR CH3-O-CH2-CH2-CH3 I think from left to right: CH3 - singlet CH2 - triplet CH2 - sextet CH3 - triplet I am unsure if this is correct?
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0answers
45 views

Controversy of acidic character of acetylene [duplicate]

Bond between carbon and hydrogen in acetylene is sp-s bond, it has very good overlap (and thus high bond strength) as compared to sp2-s or sp3-s C-H bond in ethylene or ethane. But Acetylene is more ...
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46 views

Some special cases of inner orbital complexes

Following statements are for $\ce{[Co(CN)6]^{4-}}:$ $\ce{[Co(CN)6]^{4-}}$ has the configuration $\mathrm{t_{2g}^6 e_g^0}$ but is paramagnetic because the last electron resides in $\mathrm{5s}$ ...
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2answers
64 views

Lithium oxide is a base, but lithium alone is not. Why? [closed]

When lithium oxide reacts with water, it is said to be a base: $$\ce{Li2O + H2O -> 2 LiOH + H2}$$ When lithium metal reacts with water, it is not considered a base: $$\ce{2 Li + 2 H2O -> 2 ...
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Optical activity of cis-trans isomers of a co-ordination compound [closed]

Why do geometrical (cis and trans) isomers of [Pt(NH3)(Br)(Cl)(py)] not show optical activity ? Thanks In Advance...
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1answer
28 views

Using a weak acid to prevent the precipitation of Mg(OH)2

I have this exercise in my chemistry book, and I have been staring at it for so long but unfortunately I have no single idea what to do and where to start. I will be so thankful for any help. $0.05$ ...
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1answer
185 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
31 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
42 views

Bond energy in hydrogen [closed]

Why is hydrogen-hydrogen bond the strongest of all single bonded compounds? The bond energy principle here is based on the stability of atom after bonding, so even other atoms, when they combine with ...
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1answer
221 views

Reaction of sulphur with calcium carbonate

Can sulphur react with calcium carbonate to form sulphur trioxide and calcium carbide, as the energy of 3(S=O) is greater than ((C=O) +2(C-O))? EDIT: i forgot to say that this is in an oxygen-free ...
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1answer
22 views

Equilibrium Constant dependence

The equilibrium constant (EC) of a certain reaction is only dependent on temperature. For instance, suppose at a certain temperature, the EC of $\ce{A + 3B <=> 2C}$ is $K$. Now if I divide the ...
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83 views

When H2NCH2CH2PH2 acts a monodentate ligand, it is the phosphine end that chelates. Why is that?

In some occasions, if the ligand acts on Pd it do so as a monodentate ligand. I am attempting to explain this phenomenon but came into a block.
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43 views

How can we find out the type of bonding present in a compound or a molecule?

For example, if the bonding in diamond, ice, MgO or CO2 is to determine, how can I find it out? How to determine van der Waals forces?
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1answer
106 views

Formal Charge in Coordinate covalent bonds [closed]

I am in an honors chemistry course right now and I would like to know the formal charges of the atoms in CO, my confusion is that because the bond is partially coordinate covalent, are the bonded ...
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1answer
75 views

Method for removing CuO in an inert environment

Common oxides (i.e., CuO or Al2O3) are capable of removal via NaOH solution. However, I am interested in removing a copper oxide layer inside an inert (Ar glovebox) environment. Thus, the traditional ...
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383 views

Hydrogen peroxide and glycerol combination

Is the mixing of store-grade hydrogen peroxide 3% and glycerol in the ratio of 1:2 (V/V) at room temperature affecting the decomposition rate of hydrogen peroxide?
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927 views

Thermal stability order of NaF, MgF2 and AlF3

I came up with a question to arrange thermal stability order of $\ce{NaF}$, $\ce{MgF2}$ and $\ce{AlF3}$ and I think the answer is $\ce{NaF>MgF2>AlF3}$ because $\ce{Na+}$ has largest ionic radius ...
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1answer
73 views

Why does ionisation energy to remove electrons from the same subshell increases? [closed]

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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1answer
126 views

Stability of Arsenic Pentafluoride [closed]

How is the above mentioned compound stable enough to occur naturally? Also, I've read that it's a covalent compound with a Trigonal Bipyramidal Structure. The Arsenic atom is $sp^3d$ hybridized. ...
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1answer
114 views

What gas is released when heating sulphuric acid? [duplicate]

I'm doing a chemistry project and am really unsure about the gas released when heating sulphuric acid.
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1answer
54 views

How to identify whether a metal carbonate is basic or not? [closed]

Magnesium carbonate is basic, but why isn't lithium carbonate also basic? And how does one determine whether a carbonate is basic or not?
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1answer
282 views

Why is it important in the iodine clock reaction that there is only a small quantity of sodium thiosulfate?

These are 2 questions . Why is thiosulphate needed ? And why In small quantities ? I know that the thiosulphate reacts with the I2 to form I ions Why is that important though ?
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694 views

What is PPM in terms of air concentration?

When they say the $\ce{CO2}$ concentration is $\pu{350 ppm}$ what does this actually mean? Does this mean that if we took a sample of air say $\pu{1 m3}$ then $\pu{350 mg}$ of that cubic meter would ...
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1answer
269 views

How can I find the equilibrium constant Kp without temperature?

The question I'm looking at is I found that that Kc = 139M^-1, but how can I determine Kp? There is no temperature given, but I was told that it is still possible to calculate.
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1answer
130 views

What is the entropy of Cu(NO3)2?

I have searched for the entropy of copper nitrate in various tables across the internet* and all I could find was its Hf. Ullmann also didn't give an any better clue. If it was not measured and ...
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1answer
34 views

Help understanding the equation for Spin Energy in Zero Field

I’m working with a system that experiences spin frustration and for me this is the first time dealing with such a phenomenon. To grasp the concept, I’ve decided to go to the basics and read the ...
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1answer
65 views

Etching of ZnS crystal by NaOCl

Can someone tell me the exact mechanism for etching $\ce{ZnS}$ with $\ce{NaOCl}$? I believe it is due to $\ce{OCl-}$ ion, just need confirmation. Many thanks.
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450 views

Does hydrogen peroxide in basic medium only give oxygen gas on oxidation?

Does hydrogen peroxide on oxidation gives oxygen gas only in basic medium? I thought that was true but I read about these reaction of $\ce{H2O2}$ in acidic medium: $$\ce{2MnO4- + 6H+ + 5H2O2 -> ...
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1answer
46 views

What is (if there is) the reaction between manganese chloride and oxygen when dry?

I had a chemistry lab and I did a error. I was supposed to make some $\ce{MnCl2}$ and then used fire to dry it but then some of it turned black, and I am supposed to quantify my error. So I am ...
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1answer
354 views

Why potassium chromate can be used as indicator in Mohr method?

Both silver chloride and silver chromate are insoluble, so why is that silver chromate is precipitated before silver chromate? Why wouldn't both red silver chromate and white silver chloride form at ...
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1answer
31 views

Difference in bonding between water and hydroxides [duplicate]

As we know, water is a covalently bonded molecule. However, the hydroxides - such as sodium hydroxide - are ionic compounds. Both of these are similar, although the difference between both is a sodium ...