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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11 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 ...
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4 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. ...
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2answers
31 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 ...
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0answers
18 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 ...
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0answers
13 views

A polymer or a substance that can stick to almost any surface..? [on hold]

I am looking for a polymer, most probably an elastomer that could stick to surfaces and can be elastic in nature. For a First year mechanical engineering project i am planning to make a rope or string ...
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1answer
76 views

What is the correct way to verify a structure's geometry? (example: 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 ...
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0answers
31 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 ...
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0answers
12 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: ...
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1answer
12 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? ...
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21 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 ...
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0answers
25 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 ...
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0answers
26 views

Measuring the Kc of equilibrium between NO2 and N2O4

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 ...
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24 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, ...
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2answers
47 views

How does a copper piece added in nitric acid change after nitrogen dioxide starts appearing?

There's an experiment I have no way of performing but want to know its results. The instructions (in short) are: Dip a piece of copper in a glass of concentrated nitric acid, $\ce{HNO3}$, using a ...
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0answers
42 views

I lost salt mass after evaporation

I was doing an evaporation experiment and I used salt and water. I started off with 5 g of salt and after the evaporation process, I was only left with 4.3 g of salt. Why is this?
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2answers
140 views

Preparing an inert atmosphere reaction vessel with only an input?

One time, the graduate student that I work with was showing me how to prepare an inert atmosphere in a double necked round bottom flask. After drying it in the oven, she used a torch to drive out all ...
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0answers
24 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 ...
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0answers
23 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 ...
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1answer
47 views

Why lithium gives flame coloration?

Theoretically 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. ...
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1answer
84 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 ...
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1answer
33 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 ...
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2answers
51 views

How to interpret TLC data regarding the purity of one’s sample

The picture provided is a sketch of my TLC data from the lab along with the $R_f$ values for $i$ (initial, un-recrystallized aspirin) $= 0.429$, $a$ (acetylsalicylic acid) $= 0.429$, and $s$ ...
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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 ...
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0answers
23 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 ...
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1answer
48 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
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1answer
49 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: ...
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2answers
48 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 ...
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39 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 ...
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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 ...
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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 ...
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1answer
36 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
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1answer
337 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 ...
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1answer
21 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!
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2answers
59 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 ...
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1answer
41 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 ...
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1answer
101 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 ...
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0answers
23 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?
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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 ...
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0answers
26 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
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1answer
105 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 ...
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1answer
194 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 ...
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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 ...
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0answers
17 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
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1answer
61 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 ...
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1answer
36 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 ...
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0answers
24 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 ...
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2answers
80 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 ...
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0answers
24 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 ...
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1answer
89 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. ...
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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 ...