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.

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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 ...
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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 ...
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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 ...
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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 $\ce{HNO3}$?
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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 ...
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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. ...
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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&...
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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 ...
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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 ...
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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-...
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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 ...
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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 ...
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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 ...
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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)...
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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 ...
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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 ...
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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 ...
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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 ...
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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) ...
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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 ...
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1answer
50 views

Is it possible to graph the equivalence of p[Cu²⁺] 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. ...
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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 ...
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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 ...
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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 ...
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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 ...
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1answer
29 views

Relative humidity at constant temperatures [closed]

It’s known that Relative humidity = (water pressure in a certain volume/ saturated water pressure in the same volume)* 100% “at the same temperature” So my question is why does the amount of water ...
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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 ...
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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 ...
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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 ...
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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 ...
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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/ ...
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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 ...
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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 ?
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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.
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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 ...
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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. ...
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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. I’m told to calculate the cell potential of a simple lemon battery experiment. After Finding out the oxidizing agents and the reducing ...
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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 ...
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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 ...
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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 ...
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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 ...
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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 ...
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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
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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 ...
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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....
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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 ...
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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 ...
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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 ...
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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 ...
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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.

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