Questions tagged [experimental-chemistry]
This tag should be applied to questions relating to the theory, design, techniques or performance of chemical experiments. This includes but is not limited to theoretical structures, expected products, thermal calculations, and empirical analysis. Additional tags should be applied to narrow down the field of research.
1,341
questions
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0answers
8 views
What is vacuum-assisted ultrasonication?
This quote from a methods section of a paper:
[samples were] ultrasonicated for approximately 30 min to ensure
adequate dispersion of the components throughout the mixture. The
solution was then ...
-1
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0answers
16 views
Removing technique of polymers from pasteboard paper [closed]
I have a white sheet (cardboard paper) completely covered with a green material which looks like the varnish that I believe is a polymer. I want to remove this material chemically without tearing ...
0
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0answers
20 views
UV Absorbent Black Coating
Are there any UV absorbent paints or coatings that can be applied to plastic suitable for the optics of a UV-Vis instrument? It would need to not fluoresce under a range of about 300 nm to 800ish nm ...
0
votes
2answers
58 views
Reaction of copper with nitric acid [closed]
$\ce{Cu}$ reacts with $\ce{HNO3}$ though $\ce{Cu}$ cannot replace $\ce{H}$ due to its less reactivity. Then, why does it react with $\ce{HNO3}$?
0
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1answer
67 views
How to get or understand a sample in chemistry without knowing its chemical name or compound or formula [closed]
How to get or understand a sample in chemistry without knowing its chemical name or compound or formula? I was thinking about whether there is a way to understand what the chemical compound sample ...
1
vote
0answers
28 views
Software for modelling decomposition reactions
What are some good softwares that can model a decomposition reactions?
I have a reaction of H2O2 decomposing on metal exchange hexaaluminate catalyst. The catalyst is present in a packed bed thruster. ...
-4
votes
0answers
26 views
Electronic Configuration of Lanthanum [duplicate]
Lanthanum has electronic configuration [Xe] 4f0 5d1 6s2. Why is the 4f sub-shell not filled even though we know that 4f is filled before 5d subshell?
I know that for some elements energy level of 4f&...
-1
votes
0answers
52 views
What material to use to connect the vacuum pump to the glassware in a distillation?
I would like some advice on the material for a tube, to be used to connect a vacuum pump to the glassware for a vacuum distillation. It would serve a tube that does not disperse the gases (it does not ...
2
votes
0answers
38 views
Liquid storage of transition metal oxides?
Transition metal oxides (TMOs) have a lot of interesting properties, from ferroelectricity to battery applications. Often times you can change the properties with only slight changes of oxygen ...
-2
votes
2answers
96 views
How is bond length of C-O and C-N same?
In NCERT and many other books it is given that bond length of $\ce{C-O}$ and $\ce{C-N}$ is same. But, how can it be possible as size of oxygen is smaller than that of nitrogen so bond length of $\ce{C-...
0
votes
1answer
40 views
Do pipettes always outclass glass syringes?
I was previously working in a lab preparing lots of samples for gas chromatography that exclusively used glass pipettes and was able to get really high precision between replicates. Now I'm working on ...
-3
votes
2answers
92 views
Are my calculations correct?
The highlighted portions are my calculations. I am unsure whether i am going in the right direction or my sig figs are off. Am I supposed to use only 3 sig figs or what the calculator shows?
volume ...
3
votes
1answer
77 views
Would any alkene possibly aromatize with proper conditions?
I was reading about 2 specific reactions: polymerisation of alkene and aromatization of alkane (of a sufficient size).
I thought why can't, having a condition that favored both these reactions be ...
5
votes
2answers
180 views
Reagent choice in the formation of Wittig reagent
During the formation of Wittig reagent, BuLi is used as it is a VERY strong base (pKa = 50). According to Wikipedia, however, sulfur ylide is 'especially conveniently' made from dimsyl anion (pKa = 35)...
0
votes
1answer
38 views
Multiday lab courses in classic chemistry [closed]
This time of the year I usually get some extra income I can use on interesting courses. Usually rescue or sport courses. However, I also have a master degree in chemistry, and would like to spend some ...
0
votes
1answer
31 views
How to make a sample in ppm? (not a specific compound, only the sample) [closed]
Is soaking 1000 mg tea powder in 0.1 L water for about 12 - 24 hours, can be considered as 10000 ppm tea sample?
Could anyone give me reference from a journal or something similar, about my question ...
1
vote
0answers
25 views
Problem encountered during high school unsaturated fats experiment
To get straight to the point, my chemistry experiment was looking at the amount of unsaturated fats in avocado oil with respect to temperature. I did this by testing for the $\ce{C=O}$ bonds using ...
-2
votes
2answers
63 views
How Do I Determine The Strength Of Two Ammonia Solutions Using Titration Methods? [closed]
Two housewives disagreed on the strength of an ammonium cleaning agent. Housewife A thought that her brand was more effective than the brand used by housewife B. Plan and design an experiment that ...
-3
votes
1answer
49 views
Is it possible to separate Lead(II) sulfate from sulfuric acid?
To prepare lead(II) sulfate $\ce{PbSO4}$ from lead(II) carbonate $\ce{PbCO3}$, can I add excess sulfuric acid to lead(II) carbonate so that the products formed will be excess acid with lead(II) ...
1
vote
1answer
42 views
What reagents change the time of a chemical clock?
I am doing a research task involving an iodine chemical clock reaction. I need to figure out which reagents in the experiment are responsible for changing the time before the colour change in the ...
3
votes
1answer
50 views
Is it possible to graph the equivalence of p[Cu²āŗ] with pH?
In no way I am a chemistry major, so please forgive me if my question seems stupid. I just need a way to find the "equivalent $\mathrm{pH}$" of $\mathrm p[\ce{Cu^2+}]$ if that makes any sense to you.
...
5
votes
0answers
110 views
Distilling milligram quantities of oil like it's late 1970s
In a currently retracted* manuscript by Tomas Hudlicky [1, Retraction Watch] the following has been noted:
Fifty years ago professors took an active part in all laboratory instructions and they ...
10
votes
5answers
3k views
Why do research papers mention experimental details in such detail?
The paper Analysis of cyclic pyrolysis products formed from amino acid monomer has the following to say in it's experimental section:
Glycine, phenylalanine, tyrosine, tryptophan, serine, and valine ...
0
votes
1answer
56 views
Why do we see complementary colors in UV/Vis Spectroscopy? [closed]
From what I read, a compound that absorbs visible light will produce a complementary color (using the color wheel), that can be seen. Why is this the case? Is it because, for example, if a molecule ...
7
votes
1answer
79 views
Is it possible to produce sulfuric acid at large scale by oxidizing and hydrating pyrite?
I was reading The Knowledge by Lewis Dartnell, which is a book about recreating our technology from scratch should we experience a civilization-ending apocalypse. The author thinks that acquiring ...
0
votes
1answer
29 views
Relative humidity at constant temperatures [closed]
Itās known that Relative humidity = (water pressure in a certain volume/ saturated water pressure in the same volume)* 100% āat the same temperatureā
So my question is why does the amount of water ...
-1
votes
1answer
38 views
Honey moisture and increase in temperature? [closed]
I've been interested quite lately on how moisture would be affected as the temperature increases. My experiment methodology is that I will be manipulating temperatures of the honey between 20,40,60,80 ...
0
votes
2answers
80 views
How to identify if a material is perovskite or not?
This is more of a materials science question, but I believe many of you have referred NIST Inorganic Crystal Structure Database (ICSD) database.
I am collecting a database of perovskite materials and ...
1
vote
2answers
88 views
How come we can't use the equivalence point equation of NV=NV in this problem?
So, the problem is you prepare to standardize a $\ce{Na2S2O3}$ solution. $\pu{32 mL}$ of $\ce{Na2S2O3}$ solution is titrated into $\pu{50 mL}$ of a $\pu{0.01 M} \ \ce{KIO3}$ solution to reach the ...
0
votes
0answers
19 views
Nernst equation for mixed cathode battery
What is the Nernst equation for a mixed cathode battery or a cell where there are multiple half reactions? I assume it is similar to unequal voltage connected in parallel? https://youtu.be/XoLzn49IZjM
...
0
votes
0answers
11 views
FAIR Data Implementation in a Corporation
I'm thinking about trying to introduce the principles of FAIR (Findable Accessible Interoperable Reusable) data into the company where I work.
refs/links https://iupac.org/fair-data-in-chemistry/
...
4
votes
2answers
528 views
How to measure the color of honey? [closed]
After doing some research, I found that honey's color could be a factor of climate. I am very interested in this subject and I'm a high school student so we don't have as much apparatus as you would ...
-4
votes
1answer
51 views
if we mix bleaching powder in water will this be converted to Sodium Hypochlorite? [closed]
if we mix bleaching powder in water will this be converted to Sodium Hypochlorite ?
-3
votes
1answer
623 views
Is bleaching powder same as Sodium Hypochlorite? [closed]
i want to know is Sodium Hypochlorite is same as bleaching powder.
can some one please let me know.
0
votes
1answer
45 views
Deviation from ideal gas law curves
So I was reading through my textbook on deviations from an ideal gas, and they had plotted a curve of experimental PV/nRT against the pressure.
They talk a lot about why the volume is really smaller ...
0
votes
0answers
37 views
What are some Qualitative test/s that you can use for benzophenone? [duplicate]
I have determined one of my unknowns to be benzophenone and in a lab setting (but that isn't possible because of COVID-19) I would conducted the 2,4 DNP test which should yield a positive result. ...
0
votes
1answer
63 views
Calculation of the cell potential of a lemon battery experiment
I have the following problem that I would like to get checked.
Iām told to calculate the cell potential of a simple lemon battery experiment.
After Finding out the oxidizing agents and the reducing ...
2
votes
0answers
62 views
What is the recipe for the Belousov-Zhabotinsky reaction for correct simulation with the Oregonator model? [closed]
For a school project I'm trying to model the Oregonator and perform some experiments with the Belousov-Zhabotinsky reaction. Like predicting the reaction and the swings in concentrations. For that it ...
0
votes
0answers
24 views
Order of adding reactants on growth of Cu
I am reading the following paper which details the steps to control growth of Copper. They fabricate Copper powders from $\ce{CuNO3, NaOH, and C6H8O6}$. Specifically, in this paper they add the sodium ...
-4
votes
1answer
47 views
does stirring honey make it less viscous? [closed]
After making some research, I found that crystallized honey does get less viscous as we stir it, so is it the same thing with pure honey or not? and also if not could we use the Zahn cup experiment to ...
0
votes
2answers
96 views
How to determine the iron content of a screw?
In Analytical Chemistry, I was asked to determine the iron content of a screw.
I thought it could be solved in the following way:
Treat the screw with a solution of sulfuric acid or hydrochloric ...
-1
votes
1answer
41 views
Main industrial method for producing ethyl ethanoate (acetate)? [closed]
I am aware there are various methods, however, which is most prevalent in industry? Researching on Google has indicated Fischer esterification or Tishchenko reaction and other versions. Which is most ...
-1
votes
1answer
40 views
can i synthesise Bis(tri-tert-butylphosphine)palladium(0) from Sodium tetrachloropalladate and tri(t-butyl)phosphine [closed]
can i synthesise Bis(tri-tert-butylphosphine)palladium(0) from Sodium tetrachloropalladate and tri(t-butyl)phosphine if so how do i isolate the product
1
vote
1answer
300 views
DIY Hand Sanitizer Clumping [closed]
Hand sanitizer is impossible to find around me and I have 4 family members who are essential and not around a sink or soap during their work day (delivery drivers), and they are out. I make a lot of ...
1
vote
1answer
24 views
Procedure vs. synthetic method?
I am genuinely confused on the difference between a procedure/flow chart and the synthetic method for a lab report and what exactly a synthetic method includes, and I can't find any information online....
-2
votes
1answer
65 views
Cooking IN CO2 gas? [closed]
Quick theoretical question:
What if I replaced water with dry ice in my pressure cooker? Assuming I used a calculated amount to prevent an explosion...
Would It be able to cook?
Would it dehydrate ...
4
votes
0answers
42 views
Why is the experimental pH of vinegar (acetic acid) so much higher than expected?
I bought some sodium hydroxide on Amazon and went about titrating solutions I make with it.
As I'm an amateur chemist at home, I have limited tools. A pad of paper, some 5% acetic acid vinegar, and ...
0
votes
1answer
55 views
What is the relative rate of diffusion of ammonia to hydrogen chloride, both in gaseous states? [closed]
I encountered this problem during an assignment:
I answered it as C, but the assignment grader marked it as wrong and indicated that A is correct.
I asked another instructor about it and gave me a ...
-6
votes
1answer
50 views
what catalyst to use for the reaction between AgNO3 and NaCl? [closed]
What is the best catalyst to use for the reaction between AgNO3 and NaCl that would result in a change in activation of energy so therefore more precipitate formed. Please give me the ways I can ...
-2
votes
1answer
49 views
How can I make AgNO3 more basic? [closed]
Is there anything that I can add to the AgNO3 solution that will make it more basic without forming a precipitate such as reacting with OH or HCl?
Please be more specific and give an example.
