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.
1,321
questions
0
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1answer
23 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 ...
-3
votes
0answers
78 views
Is honey a good choice for chemistry senior essay? [closed]
I am doing my senior essay on chemistry and I was interested in honey, the only thing that's scaring me is that my content is more of biology rather than chemistry, in other words, does honey involve ...
-2
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0answers
18 views
What happens when sodium aluminate reacts with sulfuric acid? [closed]
I added concentrated sodium hydroxide to an aluminium foil, and later added water after the reaction ended. The solution which I thought was aluminum hydroxide. But after testing it with acid, the ...
-1
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0answers
16 views
It's an electrochemistry question [closed]
Molten aluminum iodide is electrolyzed using graphite electrodes:
-Write the overall electrolytic cell reaction (physical states are required).
-1
votes
1answer
36 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
60 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
67 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
16 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
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0answers
8 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
488 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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votes
1answer
35 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
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1answer
77 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
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1answer
43 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
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0answers
33 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
58 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 ...
-1
votes
0answers
26 views
Is it ideal to use a Zahn cup to measure the viscosity of honey?
I am a high school student, and I'm looking for the ideal way to measure honey's viscosity. unfortunately, we do not have a viscometer so I cannot use that but I made some research and the most ...
2
votes
0answers
50 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
39 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
92 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
39 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
39 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
158 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
22 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
60 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
41 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
43 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
49 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
47 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.
1
vote
1answer
66 views
Significance of shapes of Conical flask and Kjeldahl flask
What is the practical significance of the shapes of conical flask and Kjeldahl flask?
1
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3answers
77 views
What is the best way to make a substantial amount of soot in a high school laboratory?
I need to make about 50 grams of soot (carbon black particles) in a high school laboratory. What would be the best way to do this?
The purpose of needing 50 grams of soot is because I would like to ...
0
votes
1answer
48 views
How to store small amounts of gas
I need to store small amounts of gas. I already saw devices that look similar to the image below, but I don't know how they are called. Does someone here know how these devices are called? I am also ...
-4
votes
1answer
103 views
Preparation of potassium cyanide from potassium ferrocyanide via HCN
Does anyone have any experience with the preparation of potassium cyanide from potassium ferrocyanide via $\ce{HCN}$ method? I did some math and am going to proceed eventually, any advice would be ...
0
votes
1answer
52 views
laser diode problem [closed]
I'm a student studying chemistry, i'm working with diode laser to look at emission spectra for certain complexes. i'm using integrating sphere as my setup, when i use the 405nm diode laser output of 4....
-1
votes
2answers
71 views
The burning candle - rising water experiment
This is a classic experiment.
On a plate with a little water place a candle and light it. Place a drinking glass over it. The light goes out while sucking up the water.
At least two things happen:
...
1
vote
1answer
41 views
Is it appropriate to call this material a hybrid composite? [closed]
The material I've synthesised is made up of two primary parts at a 1:1 ratio:
Part 1: agar, glycerol, water.
Part 2: polyurethane resin.
The agar mixture on its own was too soft, so I added the ...
6
votes
3answers
681 views
How to control current and voltage in electrolysis
I am doing an experiment that aims to determine if the rate of electroplating changes with the temperature. I am using a copper rod, a solution of copper(II) ions and a neutral rod to be coated. I ...
1
vote
2answers
40 views
Particle size vs dissolving rate of sucrose
I’m required to make a lab with this information only (particle size vs dissolving rate of a solid (molecular covalent compound-sucrose)? so far what I’m thinking is using three different kinds of ...
3
votes
1answer
126 views
Why does the test tube face downwards in gas production?
In the preparation of $\ce{NH3}$ from $\ce{NH4Cl}$ and $\ce{Ba(OH)2}$, my teacher said that when heating the test tube, the test tube faces downwards as opposed to upwards. Why is this so? Wouldn't ...
0
votes
1answer
55 views
How does one determine whether a chemical requires hazardous waste disposal?
It is pretty easy to find information about the actual hazards of a chemical in the SDS, but I have been struggling to sort out which classifications require that the compound be handled differently, ...
3
votes
1answer
77 views
Is there any collection of charge density maps for small molecules? Any good data at all?
Despite wide variety of existing experimental methods producing electron/charge density maps, I failed to find a good dataset of experimental data for small (1-3 atoms) molecules.
There are datasets ...
-4
votes
2answers
53 views
What is meant by position 5' or 3' [closed]
I'm a self-learner that likes to keep up with current research. However, I can't find what is meant by expressions such as 5' or 3' positions on chemical structures. But , in particular, what is meant ...
0
votes
1answer
40 views
The rate of change in pH v.s Temperature
I have somewhat established that there is a linear relationship between change in pH of carbonic fizzy drinks over time. I also realise that the pH increases linearly faster for the same carbonated ...
2
votes
1answer
89 views
Why is absorbance in UV-VIS spectrometer negative even after calibration?
I was collecting data to plot a calibration curve using pure beta-carotene sample. Prepared 5 different concentrations of beta-carotene dissolved in methanol. Pure methanol was used as blank. However, ...
5
votes
2answers
415 views
How does pH of soda drink vary with time
Basically I have done an experiment where I measure the pH of my soda drink at a specific temperature over $\pu{45 min}$. At every temperature, the $\mathrm{pH}$ of my soda drink increases, but much ...
0
votes
0answers
26 views
Why does peak decoupling occur in H-NMR spectra?
For example, when we analyze the conversion of some chemical compound, certain characteristic areas tend to decrease (ok).
However, why can a peak (i.e., one peak) generate smaller peaks (i.e., more ...
1
vote
2answers
141 views
Reaction between copper (II)chloride and aluminium foil [closed]
When I reacted copper chloride and aluminum foil instead of getting the brown color I got green color. Can anyone share their procedure where the experiment actually succeeded?
2
votes
0answers
43 views
How to determine the pH of citrate buffer system
I used this table (http://microscopy.berkeley.edu/Resources/instruction/buffers.html) to make a citrate buffer system. The Pka value is 6.4, and I multiplied the solution by ten to make a larger batch....
-1
votes
1answer
37 views
How is silica gel made? [closed]
How is silica gel prepared from sand (after extracting it). How many ways can it be used? Is there a way to make it without an oven?
4
votes
1answer
80 views
Fractional index in a chemical formula of metal oxide
I have just read an article in which they used $\ce{WO3}$ and $\ce{WO_{2.9}}$ as precursors, whose objective was to form $\ce{WS2}$, in an atmosphere of argon by CVD. In one boat there is the powder ...
