All Questions
Tagged with inorganic-chemistry experimental-chemistry
237
questions
2
votes
1
answer
111
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Why is the Molar mass of CO2 different than the weight of the sum of its particles?
The Molar mass of CO2 is stated to be 44.009 grams per mol
But in a calculation of the weight of each atom's particles((Electrons,Protons,Neutrons) times Avogadro's constant
I get 44.36 grams per mol
...
- 155
4
votes
1
answer
87
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Brilliant fluorescent properties of Na2S(x) obtained from Na2SO3 or Na2S2O3
When $\ce{K2SO3}$ or $\ce{Na2SO3}$ is heated strongly by any method (in a flame, in an electric arc, on a metal plate in an induction heater), the resulting residue should be a mixture of $\ce{Na2SO4/...
- 115
-3
votes
1
answer
69
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Standardizing alkaline ferricyanide solution [closed]
The ferricyanide method of determining reducing sugars is simple but I need clarity on time of addition of potassium iodide solution. I am unable to observe change in color from yellow to blue. I even ...
- 1
-1
votes
1
answer
98
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Percentage Yield
For the above MCQ question, I took the equation to be
$$\ce{CaC2 + 2H2O -> C2H2 + Ca(OH)2}$$
I then calculated the moles of $\ce{CaC2}$ as 0.7273 moles, which has a 1:1 molar ratio to $\ce{C2H2}$, ...
- 127
0
votes
0
answers
30
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How does a conc. electrolyte solution extract water from a organic phase like diethyl ether or ethyl acetate?
In organic chemistry, often, during the last steps of a workup we use concentrated brine solution (NaCl) to "extract" the water from the organic layer, especially when we have an organic ...
- 51
5
votes
2
answers
197
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Synthesizing Cyclotetrazane from Hydrazine and Diazene?
Could cyclotetrazane — a compound with nitrogen atoms arranged in a square configuration — be synthesized? A hydrogen atom would be bonded to each vertex (nitrogen atom):
Could cyclotetrazane be made ...
user145192
1
vote
1
answer
48
views
Need help with synthesis of iron (II,III) oxide (Fe₃O₄) nanoparticles
I am attempting to synthesize iron (II,III) oxide nanoparticles (Fe3O4). I have some iron acetate and have seen some literature where people have synthesized Cu nanoparticles using a polyol process. ...
- 105
0
votes
0
answers
32
views
Does manganese dioxide disperse differently in bases than in water?
As part of a project in uni I've been given a task in my chemistry laboratory to synthesise manganese dioxide powders.
I prepared a precipitate of it by reacting manganese chloride with sodium ...
3
votes
1
answer
129
views
Schlenk line simultaneously opening vacuum and gas
I’ve been working in the lab for some time now, but I’ve found conflicting information when asking this question, so maybe you know the answer.
When working in a Schlenk line with double oblique ...
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-2
votes
1
answer
96
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Why potassium carbonate breaks glass when heated? [closed]
I have been studying about desiccants for a while and testing some inorganic salts, including calcium chloride, sodium sulfate and potassium carbonate. When they get enough moisture from air, I ...
5
votes
2
answers
371
views
Using potassium dichromate and sulfuric acid to clean test tubes after Tollens’ test
We had an experiment at school to find out the biomolecules contained in the different foodstuffs. After doing Tollens’ test which turned out to be positive, our teacher instructed us to clean the ...
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-3
votes
1
answer
357
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why are there no pictures or experiments on solid ozone?
wikipedia states that solid ozone is violet black in colur and so is my textbook, but when you search up for solid ozones, there are no pictures or experiments done in youtube. Was the colour or the ...
2
votes
0
answers
58
views
High-temperature interactions with salts on nichrome wire
I'm working on creating aluminium-doped zinc oxide (AZO) thin films, but instead of the usual glass substrate, I want to try this on a fine nichrome wire.
I'm using a mix of zinc acetate $\ce{Zn(...
- 29
2
votes
1
answer
45
views
Production SnO2 nanoparticles through chemical co-precipitation method: chemical equation of the reaction
In this paper, the production of $\ce{SnO2}$ nanoparticles through the chemical co-precipiation method is described using $\ce{SnCl2·2H2O}$ as a precursor. According to their experimental section,
$\...
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-4
votes
1
answer
216
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How Can the First Ionization Energy of Helium be Accurately Calculated Using Basic Quantum Mechanics?
How Can the First Ionization Energy of Helium be Accurately Calculated Using Basic Quantum Mechanics?
There is a book which summarizes the fairly accurate calculation of the First Ionization Energy of ...
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