All Questions
Tagged with experimental-chemistry physical-chemistry
148
questions
2
votes
1
answer
113
views
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
0
votes
0
answers
30
views
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
1
vote
0
answers
37
views
Trends in pKb for both acetic acid and water
I am trying to rationalise a result that I have recently measured in the lab. I'm measuring the pKb of different compounds in anhydrous acetic acid, using the procedure outlined in this paper (https://...
- 11
1
vote
0
answers
29
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Surface treatment and current density: electrodeposition of Cd and Ag
I'm currently working on a cadmium and silver electrodeposition project.
Let me explain:
I'm doing electrolytic surface treatment on low-alloy steels as well as stainless steels. At present, we have ...
- 11
-1
votes
1
answer
268
views
In JJ thomson's cathode ray experiment why is the effect of gravity on the electron not considered? [closed]
Explaining the setup:
The experiment is described in the picture.
Instead of the magnets in the picture imagine two circular coils on both the sides with current running through it, this creates a ...
- 35
-2
votes
3
answers
674
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Can pure hydronium exist?
Can pure hydronium exist? If not, why not? It seems to me (and I am no chemistry expert) like pure hydronium should have the theoretical maximum acidity or minimum pH that a substance can reach.
Can't,...
2
votes
1
answer
272
views
pKa and pKb in solvents other than water
I know that when you have aqueous solutions, then the pKa and the pKb are linked to each other (pKa + pKb = 14). Is there an equivalent relationship between pKa and pKb in non aqueous environments? I'...
- 51
-3
votes
1
answer
76
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Can someone help me with the experimental tabulation or spread sheet data on enthalpy, temperature, and pressure for aluminum and oxygen combustion [closed]
I need an experimental tabulation or spread sheet data of enthalpy, temperature, and pressure tabulated in columns for aluminum and oxygen combustion under non standard conditions.
Any references to ...
- 15
1
vote
0
answers
44
views
Better Way for Crushing Coconut into 500 mesh Coal for Carbonization
I am planning to use coconut as a raw material for carbonization, but I need to crush it into 500 mesh coal. Currently, I am using a mortar and pestle to grind the coconut shell into a fine powder, ...
- 19
-2
votes
1
answer
216
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Disposal of Aqueous Magnesium Salts
Where can I find out where (specifically) aqueous magnesium chloride and aqueous magnesium bromide can be disposed? I was trying to find out whether solutions could be diluted and washed down the ...
- 39
0
votes
1
answer
284
views
What are the reactions between Zinc acetate dihydrate and Methoxyethanol? [closed]
I am synthesizing a sol-gel solution with Zinc acetate dihydrate + Methoxyethanol and ethanolamine as stabilizer, and I wonder what are the reactions that are taking place in the process. Could you ...
- 19
0
votes
1
answer
71
views
How to electroplate vias and THT holes on PCB with copper?
How can I electroplate copper into PCB's vias and THT holes?
I found several instructions, but they all use palladium (which is expensive), or calcium hypophosphite (which I can't get in my country), ...
- 9
3
votes
0
answers
149
views
Why the change of the position of the salt bridge or metal piece leads to different voltage value?
I am doing an experiment where I use salt bridge to create galvanic cell. The goal of my experiment is to find if there is some correlation between the amount of solvent being used and the voltage ...
- 139
2
votes
0
answers
59
views
Are there any chemistry research classification systems?
There are research classification systems for mathematics (MSC) and physics (PACS and subsequently PhySH) which help the researchers to navigate through codes composed by letters/numbers made by ...
3
votes
0
answers
117
views
Products formed on the reduction of KMnO4 in aqueous solution
The Latimer diagram for $\ce{MnO^-_4}$ is given below:
$$ \ce{MnO^{-}_4 ->[0.56V] MnO^{2-}_4 ->[2.26V] MnO_2 ->[0.95V] Mn^{3+} ->[1.51V] Mn^{2+} ->[-1.18V] Mn}$$
Then I have calculated ...
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