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.
1,376
questions
1
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2answers
43 views
Are there any “catalysts” that decrease the rate of reaction
Catalysts are things you can add to a reaction that provide an alternate reaction pathway for the reaction that decreases the overall activation energy of the reaction meaning the reaction is faster ...
-4
votes
2answers
34 views
Acid boric preparation [closed]
Is there a simple reaction to yield boric acid ($\ce{H3BO3}$) from boron trifluoride ($\ce{BF3}$)?
1
vote
1answer
39 views
Etching PCB - dealing with anhydrous ferric chloride
I'm looking into PCB etching,which requires ferric chloride (There are other etchants, but they're pretty hard to come by where I live and too expensive if I can find them).
The issue is that where I ...
-2
votes
0answers
11 views
0.1 M NaOH is being added to 50 ml of 0.1 M acetic acid. Calculate pH at equivalence point and befote equivalence and after equivalence point [closed]
O.1M NaOH &
0.1M acetic acid
I haven't found any answer.
I'm confused.please answer Asap.
0
votes
0answers
14 views
Test agent formula help for detecting water in diesel or kerosene fuel [closed]
I am trying to create a powder for use in a test that indicates water in diesel or kerosene.
The power should dissolve into the test container of diesel or kerosene but if water is present the agent ...
27
votes
9answers
6k views
Why is chemistry unpredictable?
Disclaimer: I am not a chemist by any means, and I only have knowledge limited to what I learned in my university's Chemistry III course. Basic understanding of everything up to valence electron ...
-2
votes
0answers
27 views
titration - phenolphthalein
Phenolphthalein was the indicator used in the titration video. It is an appropriate indicator for the reaction because? This was in strong base/strong acid.
a. it's colour change from colourless to ...
-2
votes
2answers
55 views
Feasibility of a chemistry experiment involving combustion vegetable oil and fuel [closed]
As a part of a chemistry experiment I would like to see the effect on the enthalpy of combustion of a mixture of vegetable oil and gasoline/diesel fuel when its percentage composition is changed (i.e ...
0
votes
0answers
27 views
What is the product of ammonia reacting with silicone?
I used a soft silicone hose to carry ammonia at ~70 °C. I was surprised to later find the hose had hardened.
A quick materials compatibility search for silicone had given me a lot of info but an "...
0
votes
0answers
22 views
Obtaining potassium silicate from sodium silicate
Is it possible to obtain Potassium silicate ($\ce{K2SiO3}$) from Sodium silicate ($\ce{Na2SiO3}$) without using expensive lab equipment such as furnaces etc.?
For example, Calcium silicate may be ...
0
votes
0answers
17 views
How come the reaction with glycerol and formic acid to form glycerol formates is not as probable as with acetic acid to yield glycerol acetates
I come across various literature when searching for the esterification reaction between glycerol and acetic acid to yield three glycerol acetates as in the image below. Essentially, each OH- group of ...
1
vote
1answer
38 views
Is it possible to make a solution of zinc oxide in a high school chemistry lab?
As part of my IB Chemistry curriculum, we are required to conduct our own experiment researching our own question. I'm in the preliminary research phase and wanted to conduct an experiment looking at ...
-2
votes
1answer
62 views
Can water be generated artificially [closed]
As we all know water that in many of the countries or states we find a lot of water scarcity. I wonder if water could be produced by artificial technology. I searched about this in google but I find ...
8
votes
1answer
324 views
What do “USP 26” and “USP 42” mean?
I am being asked by a colleague if the Polyvinylpyrrolidone (PVP) we buy in our lab is "USP 26" or "USP 42". I've never heard those terms before. I searched up online but found ...
-1
votes
1answer
38 views
How would one determine the temperature needed such that hydrogen peroxide will start to decompose? [closed]
Hydrogen peroxide decomposes at room temperature and so I was wondering what temperature is sufficient for this decomposition to occur.
Can someone explain how we can determine this? (theoretically or ...
-1
votes
2answers
45 views
Oxygen depriving gas/compound
A scene from the movie TENET made me think of a question. In the scene a gas is released into a room that is filled with precious artwork. The gas is used to rid of all oxygen in the room so fire ...
2
votes
1answer
55 views
Problem with epoxy silane (Random results in glass silanization). What are crucial points to look at?
I`m trying to immobilize an antibody onto the glass surface by means of GPTOMS (glycidoxypropyl trimetoxy silane). Using the same protocol (silanization in toluene) I get different results any time, ...
3
votes
1answer
60 views
Removing Iron Oxide from a Floppy Disk?
Don't ask me why, but I did an experiment where I tried to remove the magnetic iron oxide layer from a floppy disk by soaking it in HCl for a week. I put pieces of floppy disk in 0 - 1 M HCl, then ...
12
votes
2answers
1k views
How to differentiate between iron and sodium flames?
According to my textbook, when a flame test of an iron salt is performed, it produces an orange, mostly yellow flame. Sodium salts also produce a yellow flame.
As the colours of these two flames are ...
1
vote
0answers
50 views
Help with iodine potassium-iodide / hydrogen peroxide reaction lab?
The setup: As part of my chemistry course, we're required to complete an in-home lab where we measure the reaction rate of an iodine potassium-iodide (IKI) solution with a hydrogen peroxide solution. ...
5
votes
1answer
130 views
Analysis of cations using sodium thiosulphate
A question in an exam was as follows:[1]
How many of the following salts are first soluble in $\ce{Na2S2O3}$ solution, followed by the formation of a white precipitate and finally the precipitate ...
0
votes
1answer
65 views
Calculating numbers of moles at equilibrium given the volume of mixture and initial concentration of reactants [closed]
The equilibrium between three substances, A, B and C Is shown below.
$$\ce{A(g) + B(g) <=> C(g)}$$
Initially there were $\pu{0.1 mol}$ of A and $\pu{0.2 mol}$ of B in the reaction mixture. A and ...
1
vote
0answers
30 views
Strange Distillation Behavior
I was attempting a fractional distillation with 1mL water and 1mL propylene glycol, and I’ve been encountering strange behavior with the heating of the mixture. The heating curve shows strange “spikes”...
1
vote
0answers
32 views
1/8 instead of 1/12 of mass of carbon atom as relative atomic mass [closed]
If we consider that 1/8 in place of 1/12 mass of carbon atom is taken to be the relative atomic mass unit, the mass of one mole of a substance will:
(1) Decrease by 1.5 times
(2) Increase by 1.5 times
...
1
vote
1answer
55 views
Why does the titanium go to the tungsten filament in the crystal bar process?
I've tried to read a report by the US atomic energy commission [1], but couldn't really find the answer, or maybe I missed it.
Why is the gaseous titanium deposited on the tungsten wire/filament ...
2
votes
1answer
43 views
Differences in using molten NaCl compared to aq. NaCl in a galvanic cell having copper anode and cathode
Since we know that copper anode will release $\ce{Cu^2+}$ ion, so I was wondering whether the cathode will thicken as copper has a lower position on the electrochemical series.
Based on my research, I ...
-4
votes
1answer
55 views
Why doesn’t it burn? [closed]
In this video by Chatzida - 11 Fascinating Chemistry Experiments (Compilation) there’s an experiment where they light a bank note on fire, but it doesn’t burn. Why doesn’t it burn?
3
votes
1answer
68 views
What is the temperature needed for a reflux using a mix of solvents as the reaction medium? [closed]
I had a quick query regarding the setup of a reaction. The procedure that I am working from states that I need to put my reaction mixture under reflux for 3 hours. The solvents used are diethyl ether (...
-1
votes
2answers
72 views
Can Na2S + H2SO4 react to give Na2SO4 + H2O? [closed]
Can $\ce{Na2S + H2SO4}$ react to give $\ce{Na2SO4 + H2O}$ or $\ce{Na2O + H2O + SO2}$?
In my textbook, it has been given that the product will be $\ce{NaOH + H2O + SO2}$. Can also the other two ...
1
vote
0answers
15 views
Does anyone have experience with polycaprolactone?
I am trying to create an emulsion from polycaprolactone. My efforts thus far have resulted in unstable emulsions which sediment and coalesce after some time. This is what I have tried:
Dissolve 5g of ...
7
votes
2answers
747 views
Why does ethylamine have two infra-red spectra? Are both correct?
The one I have in my textbook is this:
Shouldn't the first trough at $3500$ to around $3000$ mean that it's an $\ce{O—H}$ group with a $\ce{C—H}$? And then the other trough at $1700$ be a $\ce{C=O}$? ...
4
votes
1answer
78 views
Why did ammonium chloride fumes turned pink in this synthesis?
I was watching the synthesis of tetrasulfur tetranitride performed by Tom on his Youtube channel, Explosion & fire. He followed the basic route: adding ammonia gas to sulfur chlorides ($\ce{SCl2}$ ...
2
votes
1answer
30 views
Experiment to demonstrate Dalton's Law of Multiple Proportions
Is there an experiment that I can do in the lab with middle or high school students to demonstrate Dalton's Law of Multiple proportions ?
For example, the reaction of $\ce{C}$ and $\ce{O2}$ to give $\...
0
votes
0answers
38 views
Adsorption of Cu2+ using banana peels for pH 2,2.5,3,3.5,4
so basically I did my experiment which is the title. This is my procedure and results:
Make 0.05M CuSO4
pipette 50ml CuSO4
change to respective pH values using HCl
Add 2g of oven-dried banana peels
...
0
votes
1answer
34 views
Place cooling bath apparatus in freezer to speed up the process?
As part of an at-home lab, my chemistry class is creating cooling baths to measure the freezing point of different solutions. We have to determine the molar mass of the solutes in these solutions by ...
8
votes
1answer
909 views
What would be the effect of adding liquid beyond the calibration mark on a volumetric flask?
If this happens in the course of preparing a volumetric solution, what should be done?
0
votes
1answer
54 views
How to change pH of CuSO4?
I'm currently very desperate to know this. I'm doing an experiment about adsorption/chelation of Cu ions in CuSO4 using banana peels using the UV-Visible spectroscopy. How do I change the pH of 0.1M ...
1
vote
0answers
32 views
Oxidation of ethanol upon heating in a test tube
The diagram shows an experimental set-up which can be used in several different experiments.
Which processes could be demonstrate by using the above apparatus?
1. Oxidation of ethanol (liquid X)
2. ...
3
votes
2answers
131 views
Are there methods for iron content determination in spinach that do not require thiocyanate?
I am looking for a way to measure the iron content of spinach for a chemistry experiment. Unfortunately I am not sure that thiocyanate will be available and I'm therefore trying to find an alternate ...
0
votes
1answer
46 views
Formation of Calcite from Calcium carbonate
So, in lab we are forming the different polymorphs of calcium carbonate. It required us to age the sample that was prepared for the formation of calcite for one week. This sample mixture was suspended ...
0
votes
4answers
119 views
If a chemical reaction is repeated multiple times, will it produce the same result? [closed]
If a chemical reaction is repeated multiple(infinity) times, will it produce the same result?
For example, I put two $\ce{H}$ and one $\ce{O}$ together, and repeat it many (infinity) times within an ...
4
votes
1answer
181 views
Why is the test for sodium as dihydrogen antimonate so specific?
I have been attending lectures of salt analysis in my college. We are at group 6 cations or also known as group zero cations, namely $\ce{NH4^+}$, $\ce{K^+}$, $\ce{Na^+}$, $\ce{Mg^2+}$.
The lecturer ...
9
votes
2answers
333 views
Sintered vs perforated plate Büchner funnels
I just bought a sintered-glass style Büchner funnel for some vacuum filtration tasks. There's two issues I'm having with it:
Filter material, especially activated charcoal, ends up stuck in the glass ...
0
votes
1answer
34 views
Karl Fischer Titration simple explanation
I'm looking for a simple explanation how the Karl Fischer method to determine the content of water works. I'm not a chemist but an engineer from an electronic-physical field and my chemistry courses ...
1
vote
0answers
28 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 ...
0
votes
0answers
21 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
1answer
70 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
31 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. ...
2
votes
0answers
40 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
168 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-...
