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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819 views

Why are ammonium chloride and ammonium hydroxide used in calcium salt detection?

On adding $\ce{ (NH4)2CO3 }$ solution to $\ce{ Ca^{2+} }$ aqueous salt solution, $\ce{ CaCO3 }$ is formed as a white precipitate, which confirms the presence of the cation. While doing the test in my ...
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2answers
530 views

Molecular formula and decimal number

Today I did some stoichiometry exercise about finding the ratio between the elements. What confused me was that while the ratio was right, but it was decimal. Ex. Reducing $\pu{0.800 g}$ of lead ...
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488 views

Which solution is more conductive

Which of the following solutions is more conductive: 1) 0.1 M sodium hydroxide and 0.1 M hydrochloric acid mixture (effectively NaCl?) 2) 0.1 M sodium hydroxide and 0.1 M acetic acid mixture (...
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668 views

Reaction between silver(I) hydroxide and an alkali [closed]

I've read about this in a booklet, but I can't find its stepwise reactions or its derivation: $$\ce{AgOH + NaOH -> Ag2O}$$ And how does a base ($\ce{AgOH}$) react with another base ($\ce{NaOH}$)? ...
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541 views

Determination of magnesium sulfate hydrate formula [closed]

A hydrate of magnesium sulfate has a mass of $\pu{12.50 g}$.This sample is heated until no water remains. The anhydrous $\ce{MgSO4}$ has a mass of $\pu{5.30 g}$. Find the formula of the hydrate. What ...
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1k views

Why does Bi show inert pair effect and not Sb?

The 6s orbital electron pair is strongly attracted by the nucleus due to the poor shielding effect of 4f and 5d orbitals. However there are other filled orbitals that shield the nucleus. In case of 5s ...
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4k views

Solubility of Alkali Metal Chlorides

Why does Potassium Chloride less soluble than Sodium Chloride in water, isn't it supposed to be other way round? Since Potassium Chloride would be more ionic than Sodium Chloride?
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189 views

Ammonia sigma bonds p character

Why does ammonia's sigma bonds to H have more p character than let's say ethane. I am guessing it has something to do with the effect the lone pair has on bond lengths and angles, but not quite sure ...
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207 views

What is the systematic name of ammonium bisoxalato cuprate (II)? [closed]

What is the systematic name of ammonium bisoxalato cuprate(II)? I already tried $\ce{(NH4)2[Cu(C2O4)2]^{2+}}$ but i am uncertain if that answer is correct.
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543 views

Confusion regarding sigma bond and pi bond

I was recently told that a sigma bond between two $\mathrm{3p}$ orbitals is possible but a $\pi$ bond between the same orbitals is not possible. Although I was not told the reason, I am speculating ...
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2answers
153 views

What type of chemical reaction is this?

So far we have learned about about single displacement, double displacement, gas evolving, neutralization, synthesis, disassociation, and combustion. I was trying to solve the following chemical ...
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98 views

Determine chemical reaction stoichiometry?

Unfortunately my background on chemistry is very weak but I have to do some experiments in that field as a part of my project. Here is my problem: I am doing some leaching experiments on realgar (one ...
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2k views

Heating of potash alum

I have this reaction : $$\ce{K2SO4.Al2(SO4)3.24H2O -> K2SO4 + Al2O3 + 24H2O}$$ And I notice that while $\ce{Al2(SO4)3}$ becomes $\ce{Al2O3}$ it doesn't happen so with $\ce{K2SO4}$. Why ? I guessed ...
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6k views

how does incomplete combustion of methane produce soot?

Ususally the incomplete combustion is formed this way: hydrocarbon + oxygen-> carbon + carbon monoxide + water. what about methane?
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1k views

Hybridization in Oxygen and Nitrogen

What is the proper orbital hybridization O and N in $\ce{H_2O}$ and $\ce{NH_3}$? The rules say that they are sp and sp2 hybridized, respectively, but some sources say both are sp3. I have problems ...
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285 views

Do the tetramminecopper(II) and hexathiocyanatoferrate(III) complexes obey the 18-electron rule?

Can anyone tell me whether $\ce{[Cu(NH3)4]^2+}$ and $\ce{[Fe(SCN)6]^3-}$ obey the 18-electron rule, and if not, why? I found $\ce{[Cu(NH3)4]^2+}$ and $\ce{[Fe(SCN)6]^3-}$ have 17 electrons, was I ...
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791 views

what are the methods to reduce ticl4 to ticl3 [closed]

I need the methods for reducing TiCl4 into TiCl3. I have searched for the methods ,but I couldn't find the answer. Please suggest me the methods
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82 views

I forgot the basics of writing equations, or maybe it is not me? [closed]

Sulfuric acid is commonly used for the pickling of iron to remove surface rust before galvanisation. $$\ce{Fe2O3 (s) + 3H2SO4 (aq) -> Fe2(SO4)3 (aq) + 3 H2O (l)}$$ However, I am not sure if given:...
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2answers
2k views

What's a natural substitute for baking powder or baking soda? [closed]

What's a natural substitute for baking power or baking soda? I am doing a project where I need a raising agent in liquid form. Naturally, I can't use anything carbonated so baking powder/soda are out ...
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2answers
9k views

Double Displacement Reactions that produce gas [closed]

What type of double displacement reactions can form a gas. How can i determine if a double displacement reaction will form a gas?
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1answer
29 views

What happens and what do we observe during this qualitative analysis of bronze? [closed]

What is the observation when we add $\ce{HNO3}$ to bronze followed by addition of dilute HCl and bubbling of $\ce{H2S}$ gas through it. Please tell the inferences as well.
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38 views

Chemical balance problem

The ammonium chloride dissociates at 317 ° C according to the reaction: $$\ce{NH4Cl (s) -> HCl (g) + NH3 (g)}$$ reaching a total pressure of 500 mm Hg in equilibrium in a closed container. What ...
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2answers
35 views

Lattice enthalpy and ionic charater

As we move down in sulphates of group 2 their solubility decreases because there is a drastic decrease in hydration enthalpy as compared to decrease in lattice enthalpy. Does the decrease in lattice ...
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1answer
31 views

Emulsification and liquid liquid surface reaction [closed]

What will happen if I skip the addition of surfactant? will the reaction happen only at the surface of the parent liquids?
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1answer
44 views

Why is the Sulphur Dioxide molecule polar? [closed]

I am in 12th standard and was revising the concept of determining which polyatomic molecule can be polar and which can be non polar. So when this example was given we were told that vertical dipole ...
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1answer
57 views

Hydrolysis of sodium carbonate [closed]

This is the equation given by my textbook for hydrolysis of sodium carbonate: $$\ce{Na2CO3 + 2 H2O -> H2CO3 + 2 Na+ + 2 OH-}$$ and it mentions that sodium ion $(\ce{Na+})$ does not tend to ...
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1answer
109 views

What happens when Ar and HCl are mixed at 77 K? [closed]

So our teacher asked us a simple question in the classroom: What happens when Ar and HCl are mixed at 77 K? and no other information was given. We replied various possible answers for that such ...
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1answer
30 views

Is an ion or a polar molecule more attracted to water in general? [closed]

I realize that there are exceptions but as a general rule of thumb, is an ion or a polar molecule attracted to water? I think that it would be ions since the charge is much larger than the net dipole ...
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1answer
45 views

Cupric and cuprous copper [duplicate]

Copper has two chlorides: $\ce{CuCl2}$ and $\ce{CuCl}.$ Copper reacts directly with chlorine to form a copper(II) chloride. Why doesn't it form copper(I) chloride? Is it because $\ce{CuCl2}$ is more ...
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74 views

What is the physical meaning of the statements like “weight percentage of FeO in Fe”? [closed]

I have always had the notion of calculating weight percentage of Fe in FeO. It always seems that we are to calculate at times the weight percentage of FeO in Fe.Particularly when one weight percentage ...
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1answer
59 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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35 views

How can I measure calcium levels in my blood at home? [closed]

I need to check my vitamin D levels regularly for my disease. It doesn't seem possible to measure at home, but measuring calcium in the blood may be more achievable since they are directly correlated. ...
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1answer
248 views

Why is Potassium permanganate a better catalyst than Potassium Iodide? [closed]

I did an experiment measuring the activation energy of Hydrogen Peroxide with different catalysts. Potassium Permanganate seems to be a better catalyst as the activation energy was lower than the one ...
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1answer
31 views

How does energy and speed affect sub-atomic particles (protons, neutrons, electrons) in an electric field [closed]

(Source: https://gyazo.com/a4d5beed3272a7ca793dd8e2f7e8be3c) I am having trouble understanding the problem above. Why does it matter if the particles are held at constant energy or speed? How does ...
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120 views

Why is a compound that is more stable gives out less energy upon reaction? [closed]

I am having trouble relating stability with energy released. For example, I am looking at a statement regarding Benzene that says, since delocalised electron model of Benzene is more stable than the ...
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1answer
73 views

Strength of oxoacids of Chlorine [closed]

I have seen various different contradicting statements about oxoacids of chlorine regarding oxidising strength & reducing strength of these. I understand the trend for acidity that HClO4 is ...
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1answer
76 views

Why oxidation state decreases

oxides of group 1 elements are Li2O , Na2O2 , KO2 , RbO2 Oxygen’s oxidation state in each compound is -2 , -1 , -1/2 ,-1/2 respectively I.e oxide-> peroxide-> superoxide my question The oxidation ...
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2answers
51 views

How does acidifying a compound in qualitative analysis make sure any interrupting compounds get removed?

So I've learnt that acidifying a compound for salt analysis is to remove any basic interference and remove interrupting compounds such as carbonates. How does it remove them or what reaction is taking ...
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1answer
39 views

Electric conductivity

Well I was wondering why some materials have a higher resistivity than others . So I took two elements randomly . I picked carbon and silicon . Carbon has lower resistivity than silicon and obviously ...
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1answer
174 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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1answer
725 views

Why is the combustion of Nitrogen endothermic? [closed]

Other combustion reactions are exothermic but this combustion reaction endothermic. Why ? Please explain..
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1answer
24 views

Dilution of Concentrated TiCl4 using deionized water [closed]

How can we dilute conc TiCl4 (>99%) to 20 % w/w, using only DI water?
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1answer
135 views

Formulation and Nomenclature of Boric and Phosphoric Acids

Why are boric and phosphoric acids are formulated as: H3BO3 H3PO4 Instead of: HBO2 HPO3 Because the acids end with the -ic suffix, the valences of the elements between the hydrogens and oxygens ...
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1answer
53 views

Quantity of base needed to neutralise litre of 36% HCl?

Sorry for asking a basic chemistry question. I last did this kind of chemistry at school about 30 years ago and I don't have confidence that I'd get it right from first principles :) Short version: ...
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182 views

If the net ionic equation and complete equation balance differently, which one do you use? [closed]

Sometimes the full equation of a reaction and the net ionic equation balance out differently. If that is the case, which is the correct one to use? For instance, in the reaction between a solution of ...
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1answer
38 views

Mole fraction concept

In a certain titration experiment, 1) when $\ce{KIO3}$ solution is added to $\ce{KI}$, the $\ce{I-}$ ion is oxidised to the triiodide complex, $\ce{I3-} $ $\ce{IO3- + 8 I- -> 3 I3- + 3H2O}\tag{1}...
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44 views

Ionisation energy is lower for higher energy shell?

Why does an electron in a higher energy orbital require less energy to remove it? Wouldn't it be harder to remove an electron from a higher energy orbital when compared to a lower energy orbital?
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314 views

Will reaction of hydrogen sulfide + copper chloride/potassium chloride occur and why?

I'm pretty new to chemistry and came across a last year's chemical olympiad in our country and I got stuck on this (I tried googling this problem but after a half of hour I gave up): Will these ...
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1answer
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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1answer
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 ...