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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2
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0answers
14 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, ...
8
votes
2answers
40 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
15 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
32 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 ...
1
vote
1answer
34 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 ...
1
vote
1answer
20 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 ...
-3
votes
1answer
49 views

Is it possible to separate aluminum hydroxide? [on hold]

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
24 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 ...
-1
votes
0answers
246 views

Calculate the percent of the initial after blue colour appears [closed]

Assume you mixed $20.00~\mathrm{mL}$ of $0.040~\mathrm{M}$ $\ce{KI}$ with $20.00~\mathrm{mL}$ of $0.060~\mathrm{M}$ $\ce{(NH4)2S2O8}$, $10.00~\mathrm{mL}$ of $0.00070~\mathrm{M}$ $\ce{Na2S2O3}$, ...
2
votes
1answer
27 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, ...
4
votes
1answer
129 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
69 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
35 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
68 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
vote
1answer
34 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
94 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
50 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
26 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
vote
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
41 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
45 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
33 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
49 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
59 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
39 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
99 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
42 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
48 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
47 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
votes
0answers
37 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
44 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 ...
0
votes
1answer
67 views

Potassium permanganate (VII) + Sulphur dioxide = colourless?

I learnt this at school when sulphur dioxide gas is combined with potassium permanganate (VII), the purple solution will decolourise or it means become colourless. However the question I want to ask ...
1
vote
3answers
100 views

Filling a buret tip before an experiment

I have a question that asks if the buret tip is not filled before the experiment what would happen (effect on molarity for acid/base titration). The way I'm thinking about it, it's not like you're ...
6
votes
2answers
130 views

Products of Lead(II) nitrate decomposition

It is known, that decomposition of Lead(II) nitrate is one of the ways of generating $\ce{NO2}$ for lab use. I recently did this in order to acquire $\ce{NO2}$ in liquid form (ambient temperature ...
1
vote
2answers
32 views

How do I solve for titration of this?

I am given $\ce{H2SO4}$ in a reaction vessel of about 50mL. I need to solve for the molarity of $\ce{H2SO4}$. A 10mL sample of $\ce{H2SO4}$ is removed and then titrated with 33.26mL of standard 0.2643 ...
6
votes
2answers
155 views

Where's my experimental error coming from?

I'm teaching chemistry to a home-ed 15 year old. Occasionally we do some practical work, since I believe very strongly that physical science learning should have some real lab work to bring it alive, ...
1
vote
1answer
49 views

Why fossil fuel is too dangerous?

This seems stupid question, but from many years I am studying that burning/combustion fossil fuel cause pollution because it releases $\ce{CO2}$. I have recently read about $\ce{CFC}$ here, which is ...
0
votes
0answers
25 views

How to plot standard curve using D-Galactouronic acid

I wanted to calculate the Pectinase enzyme activity. so how can I plot standard curve using D-galactouronic acid ? also is it possible using glucose ?
0
votes
1answer
64 views

How can I turn Pine-Sol into an oil?

I'm wanting to make a Pine-Sol scented candle. However, in candle making you have to add a fragrance oil. People make them all the time by adding vanilla, etc and canola oil, vegetable oil, etc. ...
5
votes
1answer
229 views

How does Ostwald-Walker method work?

From searching online I found this: The apparatus consists of two sets of bulbs. The first set of three bulbs is filled with solution to half of their capacity and second set of another three ...
0
votes
0answers
58 views

Algorithm that calculates damage from adrafinil?

is there such a thing that calculated damage of adrafinil based on dosage? lets say i take a dosage of 100mg/ day for 100 days, what would the affect be? how much % of my liver will be damaged? Do ...
0
votes
1answer
126 views

Finding rf value of methyl benzoate

What is the $R_f$ value of methyl benzoate and 3 nitro methyl benzoate in hexane and ethyl acetate?
1
vote
1answer
54 views

Solution, hardener and metal required to cast key duplicates

I just watched this YouTube video for a DIY key duplication system and was trying to figure out what all the material components could be: The "mold solution" (parts 1 and 2) The "hardener" The "low ...
1
vote
1answer
81 views

Why can't organic acids be concentrated and used like concentrated sulphuric acid, etc?

Is it possible to make organic acids concentrated like inorganic acids like concentrated sulphuric acid, etc?
1
vote
2answers
34 views

Can citric acid protonation produce benzene and water

Is this reaction possible: $\ce{C6H8O7 + 12 H3O -> C6H6 + 19 H2O}$? Considering that the $\ce{H+}$ can be induced by ionization of the citric acid solution the benzene can be produced in this way?
2
votes
1answer
72 views

What will happen when a metal reacts with an acid which is neither dilute nor concentrated?

We have always studied about metals reacting with dilute and concentrated acids, but I do not understand what will happen if the same metal reacts with an acid that is neither concentrated nor dilute? ...
4
votes
1answer
284 views

Making Zn in school lab

I want to make $\ce{N2O}$ in my school chem lab. I'm thinking of making it from $\ce{Zn_{(s)}}$ in $\ce{HNO3_{(dil)}}$ : $$\ce{ Zn_{(s)} + HNO3_{(dil)} -> N2O + Zn(NO3)2 + H2O }$$ I'm not able ...
2
votes
4answers
176 views

How to figure out if the reaction proceeds via SN1 or SN2 mechanism?

I have been assigned with the task of figuring out whether a reaction is $\ce{S_{N}1}$ or $\ce{S_{N}2}$. The information that I have is, that the yield is dependent on solvent polarity. More ...
0
votes
0answers
61 views

Reaction in assay mixture (octanal, DTT, sodium phosphate buffer)?

I am getting precipitates in the following mixture, and am not too sure what reaction is occurring and whether it is possible to maintain all three components in my assay (I am trying to reproduce an ...