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 ...

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-4
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0answers
19 views

how does iron reacts with the vinegar solution? [on hold]

how does it react when it is dipped in the vinegar? and what reaction is it called? why? please give me the exact reason to make sure my conclusion in my experiment is A+ thanks in advance.
0
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0answers
12 views

Will rust be form in alkaline environment like lime dust?if yes then how? [closed]

As per recent discussion some body told me that there is no severe requirement of paint over a lime plant.
2
votes
2answers
55 views

How do technicians treat spilt mercury and bromine?

As we know, mercury and bromine are in liquid state at room conditions and they are hazardous. The technicians should have ways to treat them if they are spilt. How can we safely treat spilt $\...
3
votes
0answers
11 views

Is there a structured data source containing information on the World Health Organisation's Stability Testing Policies?

Hoping to automate some product testing guidance software, I've been attempting to find a (hopefully live, up-to-date) Database, Web-service, or other structured data source containing the ...
1
vote
0answers
39 views

Grapes in a Microwave - Experiment

I am considering attempting an experiment in which one puts two, almost severed, halves of a grape in a microwave with a glass over it. To my knowledge so far, the grape halves act as focal point for ...
0
votes
1answer
61 views

How to set up a home laboratory? [closed]

How would I set up a home lab at home. I want to study chemicals and I have been given a medium-sized(6ft by 3ft) space in the garage.
1
vote
1answer
44 views

3 chemicals to produce light

I'm actually looking for 2 chemicals that will produce a really small exothermic reaction. The 3rd chemical would be there to separate the chemicals - like oil, water, and air. Ideally, the 3rd ...
2
votes
0answers
19 views

How to calculate weight percentage of each ester after gas chromatography?

I run the GC for algae samples and got the retention and areas for external standards and each sample. But I want to know how much FAME I have. For example, what is the weight percent of C16:00 in my ...
2
votes
1answer
20 views

Evolution of gas during chemical reaction

Why is it that whenever hydrogen gas is produced in a reaction, it comes out in the form of tiny bubbles, but whenever Carbon dioxide is produced it comes out in the form of a brisk effervescence like ...
0
votes
1answer
19 views

The Thomson wheel experiment

JJ Thomson did an experiment with discharge tube using hydrogen gas. Later it was found that anode rays and Cathode rays both exist at the same time.. Cathode rays move opposite to anode rays. My ...
1
vote
1answer
18 views

Water contamination of Polyol F0350 [closed]

I just got asked this question on an interview: I transported Polyol F0350 in 3 tanks. Upon arrival one tank was determined to have an unacceptable water content. It may have been contaminated with ...
1
vote
2answers
47 views

Will SnO2 or SnO form from this reaction?

I have two possible chemical equations for a reaction between $\ce{SnCl2}$ and $\ce{H2O}$. The first one is: $$\ce{2SnCl2 + 2H2O +O2 -> 2SnO2 + 4HCl}$$ where the reaction draws on oxygen from the ...
6
votes
1answer
76 views

Removal of tetrabutylammonium from an organic reaction

I need to synthesize some organic compound for my Ph.D. research. Everything went OK during the synthetic route but got messed up at the very end. In my final step (once the final compound has been ...
-5
votes
0answers
37 views

How did Avogadro discover 6.022E23?

I would like to ask how did Avogadro find out the number of 1 mole is 6.022x10^23 atoms? What experiment did he do to prove his discovery?
1
vote
0answers
29 views

Automated chemistry test machines? What is currently done, and what is research leaning towards?

There are small and large chips and machines to effect admixtures,blends, fusions of different chemicals into a variety of test samples, and there are machines to measure many vials of all kinds of ...
0
votes
1answer
59 views

How to make γ-MnO2 in a lab?

I am working on Li-ion batteries, and I need to use γ-$\ce{MnO2}$ (electrolytic manganese dioxide). I have googled and read quite a few papers, but I am not very sure of those methods. I'd love ...
5
votes
1answer
101 views

How to prevent dripping when using a Pasteur pipette with solvents like diethyl ether?

I'm trying to use a Pasteur pipette for pipetting diethyl ether and regardless of the angle I hold the pipette at, the diethyl ether will automatically start dispensing itself (I am unsure of what ...
2
votes
1answer
50 views

Gel electrophoresis separates proteins on the basis of what property?

In SDS-PAGE for separation of proteins, SDS is an ionic detergent that coats the unfolded protein to mask its native charge and give at a uniform charge to length ratio. Since the length of the ...
1
vote
2answers
26 views

How does impurity of distilled water vary with time in air?

If I place distilled water in a glass beaker, how long is it expected to stay distilled? What are the causes of it's impurity through air or other sources?
1
vote
0answers
17 views

Does the synthesis method used to make graphene oxide composites matter?

I'm doing a research project to test the photothermal conversion performance of graphene oxide composite materials. We're using a number of different metals and metal oxides ($\ce{Au}$, $\ce{Ag}$, $\...
0
votes
1answer
26 views

Evaporate propylene glycol

I tried to make a cannabis infused e-liquid. I made a tincture with marijuana and vegetable glycerin, but it became to thick so a mixed in more propylene glycol than I'd originally planned. Now the e-...
1
vote
2answers
33 views

Is there a way to counteract the problems with weighing hot objects?

I am currently performing an experiment in which it would be greatly beneficial to be able to accurately measure the mass of a hot object without waiting for it to cool. The current plan is simply to ...
0
votes
0answers
18 views

Calculation of precise Methane concentration in a closed vessel (incubation bottle) (Gas chromatography)

I'm having some difficulties interpreting results from one of my experiments and more precisely, I'm lost in conversion between units, taking into accounts dilution factors etc. Basically I'm running ...
4
votes
1answer
81 views

How much lactose is there in milk (mechanism)?

Iodometric titration is sometimes used to find out how much lactose there is in milk. The overall oxidation reaction is written as follows. $$\ce{C12H22O11 + I2 + 3NaOH ->[\ce{CuSO4}]C12H21O12Na + ...
0
votes
0answers
36 views

If pure silicon and water are combined and then subjected to radiolysis from Gamma radiation, what will the product be

I asked this and I was told that The radiation would probably rip bonds apart indiscriminately, making hydroxyl radicals, hydrogen atoms and a large concentration of crystal defects in the silicon....
1
vote
0answers
23 views

Let's create a masterlist for generic sources of errors and suggestions to improve them [closed]

This would be very helpful for the writing of lab reports, etc. The correct answer will be the one that has the most number of useful sources of error as determined by number of votes. To get the ...
5
votes
2answers
60 views

Percent difference: What to place on the denominator?

I'm genuinely confused on what to put on the denominator for the formula $$\%~\mathrm{difference} = \mathrm{\left|theoretical~-~experimental\right|\over theoretical}$$ or some other similar formula ...
3
votes
1answer
63 views

Concentration of NaOH to dissolve glass

I am doing a physics experiment in which it is required to etch the outermost glass layer from a coverslip (regular lab apparatus). What concentration of NaOH should be dissolved in water, and how ...
1
vote
2answers
48 views

Drying solvents while taking care of purity

I need to dry some solvents like $\text{MeOH, EtOH, and DMSO} $ and I have to take care of purity of the solvents. These solvents are HPLC grade. I am interested in freezing point and boiling point ...
3
votes
1answer
241 views

How are van der Waals parameters determined experimentally?

If the ideal gas law $PV=nRT$ is not enough, as a second approximation the van der Waals equation $$\left(P+a\frac{n^2}{V}\right)\left(V-nb\right)=nRT$$ is applied. The constants $a$ and $b$ are van ...
4
votes
2answers
77 views

Are titration, recrystallisation, functional group analysis, etc. outdated?

In modern chemistry, - pH meter, ion electrode, AES, HPLC, etc. replacing titration - HPLC replacing recrystallisation - IR and NMR replacing melting point analysis, derivative analysis, functional ...
0
votes
1answer
29 views

Estimation of calcium EDTA [closed]

How can i estimate calcium EDTA in a given sample? We tried estimation by using mercuric nitrate but in vain we cant get a sharp end point.
0
votes
3answers
35 views

How to measure the water content of opaque liquids?

Water content of (semi) transparent liquids could be approximated via absorption spectra. What method(s) can be used to measure the water content of an opaque liquid such as milk for example?
1
vote
0answers
14 views

Theoretical Concentration (in PPM) of CO2 production after 1 minute

I recently conducted an experiment to determine ideal ratio of baking soda and citric acid that would produce the most amount of CO2 in water. We used 250ml flasks filled with 120ml water. The samples ...
1
vote
0answers
28 views

A material that could stick to almost anything? [closed]

I am looking for a material that could easily stick to any surface on impact and also detach easily. The Reason: I am making a machine for my first year Mechanical Engg. project that would throw ...
0
votes
1answer
29 views

Does conductivity change in a solution due to rust?

I plan on conducting an experiment in which I place an iron nail in water and analyze its rate of corrosion into rust with different concentrations of NaCl. My original plan was to cover the water in ...
1
vote
0answers
15 views

Can fluid catalytic cracking work on a smaller scale in a laboratory?

Fluid Catalytic Cracking usually requires a very large and tall structure. Is there a way of miniaturizing the process to fit inside a chemical lab with 10 ft ceilings? Specifically: can a fluidized ...
1
vote
0answers
8 views

How can I permanently write on HDPE plastic?

So I just spent the better part of an hour graduating a food grade HDPE 5 gallon bucket with permanent marker so I can easily fill it with water of a certain amount for homebrewing. I'm all done. The ...
1
vote
0answers
46 views

Mixing Oxalic acid and glycerin

I am doing an experiment for a miticide for honey bees I will be dissolving 600g of 99.6% Oxalic Acid in one liter vegetable Glycerin @ 150F. I have been told it will give off formic acid fumes ...
1
vote
0answers
5 views

Parameter effects on kinetics of esterification for bio-diesel production

I want to discuss the effect of parameters on the kinetics of esterification for bio-diesel production. In esterification process, temperature effect and molar ration are two important parameters. ...
4
votes
4answers
76 views

To heat or not to heat; distillation?

One of the questions in a recent past paper I completed was: One way to make water from the reservoir suitable for drinking is by distillation. Describe how water is distilled. And I ...
1
vote
0answers
25 views

Is UV-Vis absorption polarization dependent ? Why?

Consider molecule of interest be dissolved in a solvent (and this molecule has absorption in the visible region). We are using a broadband visible light source say tungsten lamp. This light passed ...
3
votes
2answers
134 views

What is the correct way to verify a structure's geometry, for example for benzene?

My goal is to compare a calculated bond length with experimental data. Benzene is obviously common enough to expect sufficient experimental data to be available for it on the internet. I have found ...
1
vote
0answers
36 views

Why are Alkali Metal Ions Soluble?

I think the question needs no elaboration. Why are salts containing Group 1A cations extremely soluble in water? I speculate that the reason involves the low charge density of those ions in a given ...
0
votes
0answers
16 views

Preparing Zwitterionic Buffer

I am trying to prepare multiple zwitterionic buffer solutions at pH 7.4. Examples include many of the following "Selected Biological Buffers" in the first table in the following link: http://www....
2
votes
1answer
14 views

Cleavage of benzyl group from alkane?

Is there a method to selectively cleave the C-C bond between a benzyl group (-CH2Ph) and a linear or cyclic alkane? Can this be done under standard conditions with somewhat widely available reagents? ...
3
votes
0answers
23 views

For alkali and lanthanide metals, is there a better liquid barrier to oxidation than mineral oil?

Most often mineral oil is used to store, protect reactive metals from oxidation. By far the best choice is to hermetically seal the metal in pure argon or some other inert gas, since, although mineral ...
0
votes
0answers
30 views

Powdering aluminum chemically?

I need a fine aluminum powder for many reactions/experiments. Could I dissolve the metal in an acid and then drop it out of solution using a base, or vice-versa? What would be the best chemicals/...
2
votes
0answers
37 views

Measuring the Kc of equilibrium between NO2 and N2O4 [closed]

I'm trying to measure the $K_c$ of the equilibrium reaction $$\ce{2 NO2 (g) <=> N2O4 (g)}$$ in different temperatures. How would I do this do this in a normal school laboratory? I was thinking ...
0
votes
0answers
25 views

Scavenging Xenon

This may well be off topic - if so I will remove it or the mods can. We will be using a good few litres of Xenon by running it through a new analytical instrument. Given it's price (at a guess, ...