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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1answer
24 views

Will trenbolone acetate in the presence of methanol yield trenbolone acetate if distilled water is subsequently added thereafter? [on hold]

I have 2 grams of trenbolone acetate. I was told to add it to 20 ml of methanol. Then wait until it is fully dissolved. Then distilled water is to be added yeilding a precipitate that is supposed to ...
3
votes
1answer
65 views

Why did the solution turn green?

I mixed L Arginine with l Citrulline in Hibiscus and green tea water which was red in color. Once the red liquid hit the mix of powdered Aminoacids the solution changed green. Can someone tell me why? ...
1
vote
1answer
77 views

How to calculate the theoretical yield of a Diels-Alder reaction?

A Diels-Alder reaction happens between 9-Anthracenemethanol (208.26 g/mol) and N-Methylmaleimide (111.10 g/mol). I'm using 0.069 g 9-Anthracenemethanol (0.033 mol) and 0.11g N-Methylemaleimide ...
-2
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0answers
20 views

Will the particle collider in Switzerland defy Dalton's postulates? [duplicate]

One of Dalton's 5 postulates are that atoms cannot be destroyed, nor created. Would the particle collider be able to?
11
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7answers
5k views

How can 30 ml of water be heated in less than 10 seconds?

How is it possible to heat a tiny amount (30 ml)[1] of water to a high enough temperature to make a coffee, in less than 10 seconds and possibly instantly? Most heaters that I know of heat water ...
3
votes
1answer
25 views

Solve this mole fraction calculation with incomplete information

I am currently trying to solve a problem that seems quite simple at the beginning but the complexity reveals itself soon thereafter. The problem is the following: You mix a known mass of water ...
4
votes
1answer
86 views

Acetone and Sodium Hydroxide

I have put in a beaker acetone and sodium hydroxide solution (approximately 1M $\ce{NaOH}$) and didn't see any colour change for 1 day (actually, it was transparent, no colour). After almost 2 days, ...
2
votes
1answer
28 views

How to convert sodium aluminate back to sodium hydroxide?

I had dissolved a bunch of aluminium foil in an aqeous solution of sodium hydroxide. The resulting solution consists mainly of sodium aluminate with very little excess sodium hydroxide. What I want to ...
2
votes
2answers
43 views

Open data in chemistry?

I am a student in computer science, which is a field where sharing research data and source code is very very much recommended. I am looking for sites where data from chemistry experiments could be ...
8
votes
4answers
1k views

How pure NaCl is typical table salt? How is it purified?

How pure $\ce{NaCl}$ is typical table salt? Is it pure enough for research-level experiments in chemistry? How is $\ce{NaCl}$ purified if need to be?
3
votes
1answer
99 views

Is it possible to chemically treat grass to make it digestible?

Is it possible to chemically treat grass after "harvesting" it to make it digestible by humans? I know we can "eat" grass, but we can't break it down in our stomachs. If there is some chemical ...
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0answers
26 views

How to cheaply extract Iodine from Povidone-iodine?

I have some amount of povidone iodine. What is the cheapest and most simple way to extract Iodine from it?
2
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1answer
39 views

Friedel-Crafts synthesis - How is HCl produced?

In the mechanism for the acetylation of bromobenzene, how is $\ce{HCl}$ gas produced? The reactants are acetic anhydride, bromobenzene, $\ce{AlCl3}$ and dichloromethane. Initially, ...
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votes
2answers
47 views

Concentration of hydrochloric acid for electrolysis?

How much hydrochloric acid (maximum) should I use to do electrolysis of water, and how much amount of voltage should I use to get the maximum of hydrogen and oxygen?
5
votes
1answer
68 views

Why are potentials of cells with magnesium electrode always lower than expected?

I have prepared the 1M water solution of magnesium acetate. Then I placed $\ce{Mg}$ and $\ce{Cu}$ electrodes in it. I predict there such reactions take place: $$\ce{Mg-2e^- \rightarrow Mg^{2+}}$$ ...
0
votes
1answer
15 views

Replacement For RF sputtering

In my experimental work, I'm following an article. It said that: A 30 nm ZnO seed layer was deposited on the glass substrates by RF sputtering of a ZnO target at room temperature. But I haven't ...
1
vote
1answer
139 views

How to cheaply extract iodine from an alcoholic solution?

I have an alcoholic solution of iodine. My goal is to extract the pure iodine without using rare or expensive compounds. How could I do this?
2
votes
1answer
44 views

Why does lithium move on the surface of water during the reaction?

If someone asks me to number the most notable "textbook experiments" I would definitely name "the comparison of the reactions of alkali metals with water" among the most favorites. We just happened ...
2
votes
1answer
61 views

Concentration uncertainty

(All volumes were measured using a measuring cylinder which has a $\text{±0.5 cm}^3$uncertainty) You have a $\text{50 cm}^3$ of 0.5 M solution to begin with You then make a 0.4 M solution by mixing ...
4
votes
0answers
25 views

How do I make a dysprosium chloride solution from dysprosium oxide?

I know that dysprosium oxide is insoluble in water. I was told that I need to add concentrated $\ce{HCl}$ to the compound and then evaporate the $\ce{HCl}$ off. From looking at the reaction equation, ...
10
votes
3answers
141 views

Does increasing concentration of copper sulphate decrease or increase its conductivity?

I am a high school student and for my chemistry lab, I did an electrolyis experiment on how the changing concentration of electrolyte (copper sulphate) will change the rate at which the copper is ...
2
votes
0answers
19 views

Preparing CdSe electrodeposition bath

What is the best way of preparing an aqueous solution containing 5 mM $\ce{CdSO4}$, 1 mM $\ce{SeO2}$, 0.5 M $\ce{Na2SO4}$ and adjusting pH to 3 by adding 0.5 M $\ce{H2SO4}$? What is the ...
2
votes
1answer
36 views

Titration of bases against HCl

Suppose I take three bases in a solution, $\ce{NaOH}$, $\ce{Na2CO3}$ and $\ce{NaHCO3}$, and I titrate this solution with $\ce{HCl}$. Since the strengths of the bases are different, does it mean that ...
2
votes
1answer
53 views

Can we do combustion caused by limited supply of air in a lab? How?

For example Ethyne in combustion by limited supply of air $$ \ce{ 2C2H2 + 3O2 ->[\Delta] 2CO2 + 2H2O + 2C } $$ vs. $$ \ce{ 2C2H2 + 5O2 -> 4CO2 + 2H2O + Energy } $$ What are the ...
0
votes
1answer
33 views

Find amount of Acid and Base required to make buffer

I am wondering if it is possible to know exact amount of acid and base that we can put in together to make a buffer. I want to make a 0.05M Extraction buffer using Disodium Hydrogen Phosphate and ...
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votes
1answer
60 views

Is it possible to separate aluminum hydroxide? [closed]

I want to know a way to separate aluminum hydroxide into aluminum and hydroxide ions, with a chemical reaction, or another process if necessary. I have $\ce{Al(OH)3}$ and I want to separate it into ...
1
vote
1answer
37 views

concentration of magnesium chloride solution in an experiment?

I want to make a solution with 30% concentration of Magnesium Chloride and I need a total of $72~ \text{kg}$ of solution. the magnesium chloride is not pure, the composition of it is ...
2
votes
1answer
34 views

Alcohol spectrophotometry

A couple of weeks ago we did a lab where we had a bunch of standard solutions of alcohol, dichromate, and sulfuric acid. We also had one unknown concentration. We heated them so they would all react, ...
3
votes
1answer
166 views

Synthesis of 4-iodonitrobenzene

I was trying to synthesize 4-iodonitrobenzene in the lab today - however, the appearance of my product really confused me. At first, I added conc. sulphuric acid to water and 4-nitroaniline. This ...
2
votes
3answers
91 views

Why is it obligatory to cool down the container of a sample to measure its mass in a lab?

We were doing an experiment about hydrated crystals and more precisely how to determine $n$ in $\ce{CuSO4.nH2O}$. After we heated the crucible we were to cool it down using a Desiccator. Then this ...
3
votes
2answers
43 views

Soil organic carbon digestion methods - safety

I have several ground up soil samples that I need to get fractions from. The fractions are based on the Century Soil Model. Briefly, the fractions relate to the approximate time frame it takes for an ...
3
votes
1answer
93 views

How To Get A Double Displacement Reaction Going

So this may be somewhat of a newbie question but here it goes. I was tasked with figuring out how to make some $\ce{NH4ClO4}$(ammonium perchlorate). I found that one way of making it was to react ...
1
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1answer
56 views

I have 100mg of a proteinase K lyophilized powder and I need to make it to a working concentration of 25mg/mL

So I know that I need to add $4~mL$ of solution to this powder, which will give me a concentration of the enzyme at $25\frac{mg}{mL}$. What I do not understand is how to decide how much of each of ...
4
votes
1answer
102 views

Experiments in chemistry involving use of stereo microscope?

I recently got a decent stereo microscope. Besides using the scope to teach my children, I have been thinking of picking up something new to learn myself. I have been interested about chemistry for a ...
0
votes
1answer
74 views

Salt Analysis using spectroscopy

A few days ago, I learned the lengthy process of salt analysis during my practicals. The process is based on deductive reasoning but is too lengthy. What I am thinking is, can't it be done using the ...
2
votes
1answer
28 views

Why use a heating block?

Is a heating block necessary for heating small chemistry samples? I figure it helps a ton (not to mention it stabilizes too) in getting heat to the reaction but is there anything else it does?
1
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2answers
39 views

What reactions can take place for the reactants $\ce{Ag/Ca^2+}$ and $\ce{Mg/Cu^2+}$?

Explain the following experiments and their results. What is their chemical equations as well? When immersing a Magnesium (Mg) chunk inside aqueous solution of Copper ions (Cu(ii)), a red-brown ...
4
votes
1answer
44 views

The use of ice water in an experiment

An experiment from Vogel that I want to conduct requires "a mixture of ice and salt of about -10 °C". Reading trough the text it appears that I need at least 1-2 liters of this. Obviously the salt is ...
4
votes
2answers
76 views

Experiment to prove that water has air

In elementary school, there was an experiment to show that water has dissolved air, which involved boiling some water and observing the drops at the surface of the container, and this proved that ...
0
votes
0answers
38 views

Is there a way to remove salt from Crude Oil without using the “desalting system”?

How can I remove salt from Crude Oil manually? I know we have DESALTING system in fields; but I would like to know another way to do so without using this system.
1
vote
1answer
63 views

What makes R-MgX a more reactive Grignard reagent than R-CuX?

What makes $\ce{R-MgX}$ a more reactive Grignard reagent than $\ce{R-CuX}$? Has it to do with solvation, bond enthalpy, electronegativity?
5
votes
1answer
60 views

Have Ionic Liquids been used to refine aluminum on an industrial scale?

Ionic liquids have been shown capable of reducing aluminum trichloride to solid aluminum at 3kw-hrs per kg of Al(s) produced instead of the current ~15kw-hr/kg. However, this would seem to neglect the ...
2
votes
1answer
43 views

How to produce fumes in chemistry lab?

In chemistry lab we perform experiments to find the unknown solution. I just want to produce some fumes in lab. We are only allowed to use few common dilute solution like $\ce{NH_4Cl}$, $\ce{NH_4OH},$ ...
9
votes
3answers
119 views

How to check if azobisisobutyronitrile (AIBN) is still active?

I will have some samples of azobisisobutyronitrile and I want to perform Barton-McCombie reaction. The problem is that the reagent is quite old and I need to know whether it has not decomposed. Do ...
0
votes
1answer
47 views

Chemistry Experiments at Home [closed]

I'm looking to set up a small chemistry lab in my garage for doing demos. I think it would be good for a freshman student I'm mentoring and also as a hobby. Does anyone know where I can buy apparatus ...
2
votes
1answer
46 views

Determine # of molecules in an unknown sample

How might one determine the # of molecules in an unknown sample? If the sample is a gas, we might use $PV=nRT$ to estimate # of molecules. If the sample is a solid or liquid and the chemical formula ...
2
votes
1answer
63 views

What would happen if you used NaNO3 instead of KNO3 in the smoke bomb experiment?

A very famous experiment goes like this: $\ce{KNO3}$, molten wax and sugar are mixed and later burnt; the resulting mixture produces quite a lot of smoke. After hearing about the experiment, I ...
3
votes
1answer
48 views

Why did HF disolve this lightbulb at the surface rather than more submerged points?

I watched this video where a lightbulb is suspended in a solution of HF. The result is that the HF dissolves the glass, but it seems like the part of glass on the surface reacted faster than fully ...
2
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0answers
39 views

How to efficiently reduce of ilmenite to pure titanium?

I am looking for a process in which reduces ilmenite to pure titanium with the highest yield possible. We are to use a process of our choice or one that we have created in conjunction with FactSage to ...
1
vote
1answer
45 views

How do I (further) lower the pH of a pyrrolidine solution?

Pyrrolidine ($2~\mathrm{mol}$) is slowly added to $164~\mathrm{ml}$ conc. $\ce{HCl}$ in $200~\mathrm{g}$ ice water to adjust the $\ce{pH}$ to $3-4$. When it is mixed, the $\ce{pH}$ is $14$, how do I ...