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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-3
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0answers
24 views

Can calcium removed from milk by adding simple salts? [on hold]

can just adding sodium sulfate or sodium carbonate preciptate all calcium in milk ?! If this is not possible , then how to do it ?!
-2
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0answers
18 views

Reactions of Phloroglucinol [on hold]

Does phloroglucinol respond to (i) Iodoform test? (ii) Cerric Ammonium Nitrate test? (iii) 2,4-DNP test? I couldn't find any good sources that answer any of these. Thank you for your help.
0
votes
0answers
22 views

Methods for producing Molecular C60 (A.K.A Buckminsterfullerene)

I wanted to know about how to produce molecular C60 - also known as Buckminsterfullerene/buckyballs. I read online that vaporising graphite in helium gas was how scientists initially discovered ...
1
vote
0answers
16 views

Making a glow in the dark substance glow only when heat is applied

I want to make a glow in the dark substance that glows only if it gets warm. How do I obtain this substance, or what chemicals to I need to mix to make it? It's going to go in a sealed glass jar ...
0
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0answers
27 views

Why lithium gives flame coloration?

Theoritically speaking, beryllium and magnesium does not give flame test because:- their atoms are comparatively smaller and the valance electrons are strongly attached to the nucleus. ...
0
votes
0answers
19 views

What high school and university courses should I take? [closed]

To clarify my rather vague question, I am working on a fairly complex theory. This theory involves the properties of atoms, all elements and antimatter. I was wondering what specific courses or ...
1
vote
1answer
53 views

What will be the reaction between tin (II) chloride and copper (II) chloride?

I just tried conducting an experiment during lunch today. Now, I calculated this reaction 4 days ago dealing with electrochemistry, $$\ce{SnCl2 + CuCl2 -> Cu(s) + SnCl4}$$ Theoretically, I got ...
1
vote
1answer
32 views

How to dissolve iron powder?

I know iron can react with many solutions, but when I tried to mix iron powder together with permanganate or dilute sulphuric acid, the iron powder would not react and instead, it just float on the ...
-3
votes
0answers
21 views

to obtain conc. sulphuric acid from dilute solution

I want to obtain concentrated sulfuric acid from its dilute solution .I think by simple boiling concentrated acid can be obtained but it can also release toxic gases so please tell me some other ...
1
vote
0answers
20 views

Column chromatography protocol for Alternanthera sessilis to fraction phytochemicals

I'm in need to find a column chromatography protocol to fraction phytochemical compounds particularly polyphenols in Alternanthera sessilis Red. I can't seem to find one. Plus this is slightly out of ...
0
votes
1answer
36 views

Why does a silanized glass surface become hydrophobic?

What is the physical reason that a glass surface becomes hydrophobic by silanization? (e.g. is it due to increase in surface roughness due to the long chains which is created on the glass surface? or ...
3
votes
1answer
41 views

Raman Spectrum of carbon chains: How to identify the vibrational modes

So I am using NWChem to calculate the raman spectra of C2H2 and C4H4. For example for the first I obtained the following frequencies: ...
4
votes
2answers
45 views

Wavy baseline in carbon NMR

I realize anything NMR-related is essentially physics, but I figured this was a better place to ask this. I have this issue fairly regularly (with one instrument in particular) where my baseline ends ...
0
votes
0answers
37 views

Hydronium Salts

When it comes to solids, hydroxide salts are quite abundant. There is $\ce{Mg(OH)_2}$, $\ce{NaOH}$, $\ce{CsOH}$, $\ce{Ca(OH)_2}$, and $\ce{Fe(OH)_3}$, just to name a few. However, (correct me if I'm ...
0
votes
0answers
20 views

Blending of butane into Gasoline..?

We are planning to study the blending studies of butane into gasoline. Liquification of butane is done but blending of that luquified butane into gasoline is creating a problem. Can any one please ...
0
votes
0answers
21 views

Which experimental procedure is best suited to determine the H2O2 concentration in an aqueous solution?

(A) precipitation with standard MgCl2 solution (B) reaction with excess Zn to form H2 (C) titration with standard H2SO4 (D) titration with standard KMnO4 My attempt/reasoning: H2O2 doesn't react with ...
0
votes
1answer
31 views

How does turbidity affect dissolved oxygen?

I have to do a EEI for school about turbiduty of water and finding the most cost effective method for purifying a sample of water. My group was planning to do a standard test where we use materials ...
6
votes
1answer
333 views

Why does sodium sulfate initially harden instead of dissolving?

I was recently drying a product by passing it through a bed of sodium sulfate in a fritted glass Buchner funnel. Once I had finished up working my reaction, in an ill-advised attempt to clean up, I ...
0
votes
0answers
12 views

Silver Chloride Electrode

How exactly does the silver-chloride electrode work, and what goes on in a "silver-silver chloride cell"? The Wikipedia page has these equations: $\ce{Ag^+_{(aq)} + e^- -> Ag_{(s)}}$ ...
0
votes
1answer
20 views

Density of LPG in g/L

What is the density of LPG (in vapour state) in g/L? Please note that I'm asking about the density of vapour LPG when it comes out of the cylinder. NOT the liquefied density!
0
votes
2answers
56 views

Spreading of Chemicals (chemistry lab) [closed]

Is it possible to spread a chemicals or the danger of a chemical if the chemical has dried up? For example if I in a lab have gotten a certain chemical on my lab paper but the chemical has dried up ...
1
vote
1answer
39 views

Experimentally finding order of a reaction

For the reaction of bromocresol green and bleach, I was supposed to conduct an experiment to find the order of the reaction with respect to bleach. To do this, I used a fixed amount of bromocresol ...
0
votes
1answer
61 views

Does changing the volume of a reactant affect the rate of reaction? Does changing the volume of HCl affect the rate of a Mg & HCl reaction?

I'm doing a experiment in which I'm testing the affect of the concentration of a reactant on the rate of reaction. The reaction is between Magnesium and Hydrochloric Acid and so I'm changing the ...
1
vote
0answers
20 views

solubility trends of alkaline earth metals

Why is the solubility trend of group 2 oxalate compounds inconsistent with the actual order in the periodic table?
0
votes
0answers
14 views

Making pressurized Hydrogen gas using acid and aluminum foil

So I am looking to make Hydrogen gas under enough pressure to fill some balloons, for a school project. Now I have access to concentrated Hydrochloric Acid and Aluminium Foil. Now I am a little scared ...
2
votes
0answers
25 views

Troubleshoot anion exchange column (Fe, Cr, Co separation)?

I ran an anion exchange column to separatate Fe, Cr, Co from solution of concentrated HCl. The column was Dowex 1x8, 200-400 mesh, diameter < 0.5 cm, lenth 7 cm. A gradient of acid concentrations ...
4
votes
1answer
84 views

HPLC: peak area vs concentration

Many text books say that there is a proportionality between the peak area of the chromatogram and the concentration. However, in my opinion, there should be a proportionality between the concentration ...
1
vote
1answer
180 views

Fe 2+ and MnO4- titration?

As a lab experiment, I am preparing a mixture of iron tablets dissolved in sulfuric acid so they can be titrated against $\ce{MnO4-}$. The tablet contain insoluble filler material. Why is it ...
0
votes
0answers
20 views

What is the experiment used for speed of reaction? [duplicate]

Choose and describe a suitable experiment to measure how the rate of reaction varies with temperature. You should include the measurements to make the methods to determine how the rate of reaction ...
0
votes
0answers
16 views

Thermodynamics of mixture of gases and gas to liquid transformation of particular gas in mixture of gases

I am working on converting the nitrogen and sulphur dioxide from gas to liquid in the mixture of $\ce{CO2}$, nitrogen and sulphur dioxide. For continuous conversion from gas to liquid phase, I want to ...
4
votes
1answer
56 views

Multiphasic liquid “flotation” experiment

I'm trying to create an experiment where two immiscible liquids are mixed and are then separated by density. Most of the container is occupied by the lighter liquid, and the small amount of heavier ...
0
votes
1answer
31 views

Chemical measurement questions

I have some basic chemical measurement questions. I have to mix 3% of potassium sulfate with calcium sulfate as an accelerant. How do I calculate the 3%? Base it off 100%? Does this question make ...
1
vote
0answers
21 views

Kinetics: Rate and Order of Reaction

I have run a reaction of 0.020M $\small\ce{FeCl3}$ and 0.020M $\small\ce{KI}$. The solvent of $\small\ce{FeCl3}$ was $\small\ce{HCl}$, but had no effect on the reaction and, therefore, has a reaction ...
0
votes
2answers
61 views

Reaction of aluminum sulfate in water

I dissolved aluminum sulfate in DI water and expected to see just a clear water solution with aluminum sulfate dissolved as ions. However, a precipitate was visible. I addd only 0.6g of Aluminum ...
0
votes
0answers
17 views

Do crystallite size and particle size need to be same?

In my experiments I have to find the particle size of nanoparticles. I use mainly XRD for finding crystallite size of nanomaterial using Scherrer formula and TEM for particle size analysis. In most of ...
6
votes
1answer
87 views

Can you synthesize phenol from salicyladehyde?

Can you synthesize phenol from salicyladehyde? Well for starters I know that salicyladehyde can be obtained from phenol through Reimer–Tiemann reaction but I was wondering if the reverse was possible. ...
1
vote
0answers
19 views

How to transfer precise volumes of viscous substances from a container to a beaker?

Pipetting doesn't work with viscous materials because the suction/pressure is not strong enough and because relatively high volumes of the liquid remain at the external walls of the pipette tip when ...
0
votes
1answer
56 views

Is there a difference between negative/positive controls and control/experimental groups?

First of all, just so I can fully understand, what is the correct definition of a control regarding science experiments? Is there a difference between the definitions of a control/experiment group ...
0
votes
0answers
13 views

Proteolytic enzyme assay using casein as the substrate

To determine the proteolitic activity of an enzyme, the enzyme assay can be used using the casein as the substrate. In the laboratory can I use a fresh milk sample instead of casein?
2
votes
0answers
17 views

3000 mg/L NH4-N solution, pH 7.8 [closed]

Can anyone suggest a protocol for preparing 1 Litre ammoniacal solution (pH 7.8, NH4-N, 3000 mg/L) from NH4Cl and NaOH? I have worked out that I need 10.7g NH4CL and 0.45 g NaOH -is this correct? I ...
1
vote
0answers
49 views

Titration curve, how to find equivalence point

If you have a graphed titration curve and have points near the equivalence point like 6.85 pH at 54.60mL titrant added and 8.01 pH at 54.73mL titrant added is there any good way to find a more ...
0
votes
0answers
44 views

Weird titration result, is this wrong like it seems?

For a titration yesterday, we used what was marked as ${0.5}$ M $\ce{HCl}$ and ${0.5}$ M $\ce{NaOH}$, adding the $\ce{NaOH}$ into the $\ce{HCl}$ that had an indicator in it. I used ${35}$ mL of ...
1
vote
0answers
15 views

Acid base properties of Non-Metal oxides [closed]

I just have a few questions and any support is greatly appreciated. What are the bases that are most likely to react with Nitrogen Dioxide ($\ce{NO_2}$) and Sulfur Dioxide ($\ce{SO_2}$) and the ...
5
votes
2answers
56 views

How to choose the correct volumes when preparing a dilution series?

Original Question A solution of dye, Amido Black 10B dye ($10~\mathrm{mM}$, $6.165~\mathrm{g\over L}$), as-provided absorbs light much too strongly for measurement of an absorbance value. It is ...
1
vote
0answers
18 views

Using absorbance to find amount of a substance in a sample

If you use absorbance to find the amount of one substance that a sample contains, and do three determinations, should you just average the three values and use that? Or just talk about them ...
3
votes
1answer
59 views

dissociation of aluminum sulfate in water

I had a question as to what happens when aluminum sulfate is placed into water. After conducting research online, I got varied answers: some say that it dissociates into Al$^{3+}$ and SO$_4$$^{2-}$ ...
0
votes
1answer
41 views

How did chemists in the 18th century learn that magnesium gain mass when it's burned?

Crucial to disprove the phlogiston hypothesis was the observation that magnesium gains mass when burns. But how was this observation made in the 18th century? Is there any way this property of ...
1
vote
0answers
40 views

Will there ever be a “last element”? [duplicate]

Recently the IUPAC added four new elements to the periodic table and it seems the race for discovering new elements is just getting faster. I was wondering if a "last element" exists; an element with ...
1
vote
1answer
31 views

Non-Linear Solubility Trend

I am doing a lab on carbon dioxide solubility in water and I have a non-linear trend which seems to agree with the accepted trend. I am examining the change in solubility as a function of temperature. ...
1
vote
2answers
47 views

Carbon Dioxide Solubility in Water

I did a lab where I tested the solubility of carbon dioxide in water at different temperatures. I took 50 mL of carbonated water at different temperatures and then I titrated that with sodium ...