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Questions tagged [experimental-chemistry]

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 field of research.

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Atomization and excitation in AES

AES (atomic emission spectroscopy) is often mentioned as both quantitative and qualitative analyzing method. From this site Atomic Emission Spectroscopy the sources such as flame and ICP are used. ...
Shira's user avatar
  • 473
-5 votes
0 answers
24 views

A chemist combines 300mL of a 0.3 M Na2SO4 solution with 200 mL of a 0.4 M BaCl2 solution. How many grams of precipitate form? [closed]

Answer key: 233.4g 21.0g 18.7g No precipitate is formed 58.5
Zack's user avatar
  • 1
-4 votes
0 answers
27 views

Which solvent can I use to dilute silicone oil so that its transparency can be maintained? [closed]

How to make transparent diluted silicone oil for shoe shiner? I want to dilute a silicone oil. Can you suggest a good solvent? Silicone oil doesn't dissolve in white spirit.
Faria Aslam's user avatar
-2 votes
0 answers
17 views

How can i find protocol for Bocylation of Amino-PEG4-Acid and its deprotection?

I intend to make mesoporous silica nanoparticles(MSNP) with a peptide attached to it. Between my target peptide and MSNP, i use Amino-PEG4-Acid as a linker molecule. Due to the order of assembling ...
Thalaa's user avatar
  • 1
-3 votes
0 answers
23 views

Iodimetric titration for reducing agent

I am stuck at point, where I want to find the % Purity of my analyte with iodimetric titration as the analyte is very strong reducing agent. I found reference which mentions titration with iodine in ...
Manjiri Jadhav's user avatar
2 votes
0 answers
30 views

TLC experiment interprentation

I am having difficulty interpreting the results of an identification test involving six different standards (dyes) in an unknown mixture of dyes, using silica gel TLC plates and acetone as the mobile ...
Samuil Odler's user avatar
5 votes
2 answers
161 views

Synthesizing Cyclotetrazane from Hydrazine and Diazene?

Could cyclotetrazane — a compound with nitrogen atoms arranged in a square configuration — be synthesized? A hydrogen atom would be bonded to each vertex (nitrogen atom): Could cyclotetrazane be made ...
Nitrogen-8's user avatar
0 votes
1 answer
56 views

Minimum volume of benzene with percentage yield

The overall yield for the synthesis of N-phenylethanamide from benzene was found to be $35.2\%$. Calculate the minimum volume of benzene, in $\mathrm{cm}^3$, required to make $10.0\, \mathrm{g}$ of N-...
Jane902's user avatar
  • 111
3 votes
3 answers
109 views

Can uncertainty be higher after averaging?

I remember my chemistry teacher said something about how the uncertainty for the average value shouldn't exceed the uncertainty of the uncertainty for the individual values because the reason why we ...
Science Central's user avatar
1 vote
1 answer
44 views

Need help with synthesis of iron (II,III) oxide (Fe₃O₄) nanoparticles

I am attempting to synthesize iron (II,III) oxide nanoparticles (Fe3O4). I have some iron acetate and have seen some literature where people have synthesized Cu nanoparticles using a polyol process. ...
assasinchop7's user avatar
5 votes
1 answer
417 views

Does the side of filter paper matter?

A question has bothered me for quite a long time. I noticed some filter papers have a smooth side and a rough side. Does it matter (in theory) if I use the smooth side or the rough side for gravity ...
Richie12138's user avatar
2 votes
1 answer
152 views

Effect of particle size on yield of copper acetylide

To avoid pure trial and error, I need some examples of experiments already done with (possibly ammoniacal) aqueous solutions, particles/precipitates of copper (both oxidation states) salts, and ...
Paul Kolk's user avatar
  • 418
4 votes
0 answers
42 views

Why cool a reaction down when adding reagents if you're only going to reflux subsequently?

I've seen several procedures using thionyl chloride (SOCl2) to make an ester, where the first step is to add the thionyl chloride to the reagent/solvent on ice or subzero temperature, followed ...
sat0ri's user avatar
  • 161
1 vote
0 answers
30 views

Trends in pKb for both acetic acid and water

I am trying to rationalise a result that I have recently measured in the lab. I'm measuring the pKb of different compounds in anhydrous acetic acid, using the procedure outlined in this paper (https://...
Stephen's user avatar
  • 11
0 votes
1 answer
56 views

About whitish layer that formed on chocolate bar

I noticed a whitish layer on the surface of a chocolate bar that I ate yesterday. I looked at the pack where it was mentioned that, "Temperature and humidity changes may cause product to develop ...
Anjankumar's user avatar
1 vote
0 answers
50 views

What precipitate is formed when a copper coin is dissolved in concentrated nitric acid?

The method being used. I am currently carrying out a school project where I am determining the copper content of 1p coins. The coins used are British 1 pence coins dated before 1992 as after this year ...
Katie's user avatar
  • 19
-1 votes
1 answer
42 views

What could be used to thicken Ferric Chloride solution?

I'm curious if it's possible to thicken Ferric Chloride so I can control it more on a less than horizontal surface ?
DevChemStudent's user avatar
2 votes
0 answers
43 views

Calculate percent composition from XPS?

I have an XPS graph and was wondering how to calculate percent composition. I do have the percent compositions that were determined from the graph, but I don't know how they were found. For reference, ...
lzzard's user avatar
  • 29
0 votes
1 answer
87 views

Testing whether an unknown powder is wheat gluten (at home)?

Last week, I ordered wheat gluten to make seitan. I received some powder and attempted a recipe, which mixes 100g of water with 100g of gluten to form a sticky dough. However in my case, I only got a ...
Alduno's user avatar
  • 109
1 vote
2 answers
53 views

Oxidation of Isopropanol by Permanganate in Basic Solution

so I've been designing an experiment where I will explore the effect of isopropanol concentration on the colour change of a solution containing permanganate, isopropanol, and NaOH. I know that the ...
Brian Yu's user avatar
2 votes
0 answers
48 views

How can I refine my method of determining iron content in spinach?

I have begun a chemistry experiment that attempts to determine how iron content in spinach is affected by the length of time it is cooked. Through research, I learned that iron content is often ...
beebs's user avatar
  • 21
7 votes
2 answers
582 views

Question about the differences of white and grey NaH properties

We are having some problems with the next reaction in our lab. As you can see, is the sulfonylation of an indole in which we use NaH (60% dispersion in mineral oil) as a base. This reaction goes with ...
Alicia's user avatar
  • 81
0 votes
0 answers
58 views

How to remove hexane from nBuLi

As described in a paper, the authors removed the hexane from the nBuLi solution "under reduced pressure". I was wondering if anyone had any experience on how to proceed safely with this ...
The Red Man Jolan Bonelli's user avatar
0 votes
0 answers
40 views

Some particles are observed inside the wall of glass vial

Recently, when I use glass vial, some particles are observed inside the wall. These particles are so small and transparent or maybe white-colored, so it is hard to observe during ordinary usage. But ...
Krang Lee's user avatar
  • 1,081
0 votes
1 answer
70 views

Volumetric flow rate ratio calculation

I'm using two tanks of nitrogen and oxygen and mixing them in different ratios to change the oxygen partial pressure in the system. System is opened to the atmosphere through the venting pipe which ...
Dario Mirić's user avatar
0 votes
0 answers
68 views

What determines the pressure in the system when the gas tanks are opened?

I have two gas tanks of nitrogen and oxygen. Mixture of gases is created at specified composition and used in the system of interest. Let's say I want to create an atmospheric conditions in my system, ...
Dario Mirić's user avatar
1 vote
1 answer
61 views

Could I expect any adverse reactions with this ink mix?

Our newest R&D project for a permanent, outdoor ink includes: $\pu{25 g}$ of solvent blue 70. $\pu{25 g}$ of nigrosene. $\pu{??? g}$ of silver nitrate in a denatured alcohol base. Several "...
DevChemStudent's user avatar
0 votes
1 answer
115 views

Is this evidence that solubility of sodium bicarbonate<sodium carbonate?

Someone introduced $\ce{CO2}$ into saturated $\ce{Na2CO3}$ solution, and observed that white precipitate is produced. He therefore claims that $\ce{NaHCO3}$ has less solubility than $\ce{Na2CO3}$. His ...
youthdoo's user avatar
  • 133
0 votes
0 answers
29 views

Does manganese dioxide disperse differently in bases than in water?

As part of a project in uni I've been given a task in my chemistry laboratory to synthesise manganese dioxide powders. I prepared a precipitate of it by reacting manganese chloride with sodium ...
A. Sreeram's user avatar
1 vote
0 answers
28 views

Surface treatment and current density: electrodeposition of Cd and Ag

I'm currently working on a cadmium and silver electrodeposition project. Let me explain: I'm doing electrolytic surface treatment on low-alloy steels as well as stainless steels. At present, we have ...
Soporelle's user avatar
0 votes
0 answers
29 views

Is it possible to create a solid from PVDF solution?

I am working on a project where I am attempting to line an aluminium tube with PVDF. The finished wall thickness is required to be 4mm thick. I have investigated such processes as injection moulding ...
PERRY COOPER's user avatar
-4 votes
1 answer
68 views

The log K value for Cr-EDTA complex is 23, still Cr(III) cannot be titrated directly [closed]

It's related to stability constants. I don't get the question and where is it taking and wanting to answer.
Akshita's user avatar
-1 votes
1 answer
60 views

What precipitate forms when adding aqueous sodium sulfate solution to an unknown white solid?

I don't understand why there aren't two solutions to the following problem: You are presented with a white solid and told that due to careless labeling it is not clear if the substance is barium ...
Spi-Phi Quotes's user avatar
1 vote
1 answer
487 views

Assignment of NMR peaks of polystyrene

I’m having trouble identifying the peak around 3,75 ppm in the 1H-NMR spectrum of polystyrene measured at 400 Hz in CDCl3. Could someone please provide their perspective on it? I see it appear in a ...
yumocci's user avatar
  • 11
3 votes
1 answer
99 views

Schlenk line simultaneously opening vacuum and gas

I’ve been working in the lab for some time now, but I’ve found conflicting information when asking this question, so maybe you know the answer. When working in a Schlenk line with double oblique ...
Mäßige's user avatar
  • 117
2 votes
2 answers
211 views

Should I remove inhibitor from methyl acrylate?

I need to run multiple aza-Michael additions of methyl acrylate with various amines (dimethylamine, benzylamine, phenylethylamine, aniline, etc.) in order to get the bis-ester. I was wondering if the ...
Matt's user avatar
  • 21
4 votes
0 answers
43 views

Largest molecules verified in a Miller Urey experiment

What are the largest molecules confirmed with confidence in a Miller Urey experiment? I know the experiment can create amino acids (which are mostly <250Da) and nucleotides (which are mostly <...
fireworksparkle's user avatar
1 vote
0 answers
20 views

visualization problem of dilution of enthalpy $\Delta_{dil} H$ data with different initial concentrations

description I have a question about the $m_f$ vs. $\Delta_{\text{dil}} H$ plot in some experimental studies. For example, the dilution-of-enthalpy data at 300 °C with two initial concetration ($m_i$) ...
acaduck's user avatar
  • 73
0 votes
0 answers
47 views

Using potassium thiosulfate instead of sodium thiosulfate in iodine clock reaction

I am familiar with the iodine clock reaction that uses sodium thiosulphate. Still, I'm wondering if I could use potassium thiosulphate instead, as it's the thiosulfate that reduces the Iodine.
Chemistry guy's user avatar
7 votes
1 answer
750 views

What is laboratory air?

Oftentimes in the literature, particularly for oxidation studies, the authors mention that experiments were performed in "laboratory air." Is there any distinction from laboratory air from ...
rmza7's user avatar
  • 939
2 votes
3 answers
116 views

How to identify salts using mutual reactions

There are ten test tubes in the rack at your disposal (1 – 10) and each test tube contains one of the aqueous solutions of the following salts: $\ce{Na2SO4, AgNO3, KI, Ba(OH)2, NH4Cl, Ag2SO4, Pb(NO3)2,...
Harikrishnan M's user avatar
-2 votes
1 answer
83 views

Why potassium carbonate breaks glass when heated? [closed]

I have been studying about desiccants for a while and testing some inorganic salts, including calcium chloride, sodium sulfate and potassium carbonate. When they get enough moisture from air, I ...
Clinfosfito's user avatar
-1 votes
0 answers
24 views

An experiment to study colligative properties

I was planning on doing a school project on the effects of gelatin on the melting point of water, as follows: Aim: To study the variation in the melting point of water mixed with gelatin. Materials ...
Harikrishnan M's user avatar
-1 votes
1 answer
256 views

In JJ thomson's cathode ray experiment why is the effect of gravity on the electron not considered? [closed]

Explaining the setup: The experiment is described in the picture. Instead of the magnets in the picture imagine two circular coils on both the sides with current running through it, this creates a ...
Saif's user avatar
  • 35
5 votes
2 answers
325 views

Using potassium dichromate and sulfuric acid to clean test tubes after Tollens’ test

We had an experiment at school to find out the biomolecules contained in the different foodstuffs. After doing Tollens’ test which turned out to be positive, our teacher instructed us to clean the ...
Harikrishnan M's user avatar
1 vote
0 answers
33 views

Does acetone react with acidic precipitate product in this reaction?

In this reaction procedure, It seems like there is a mistake in step 3 which would result in a 0% yield. From step 3, it looks like everything is fine, its performing the acid catalysed hydrolysis of ...
DocManIM's user avatar
-3 votes
1 answer
240 views

why are there no pictures or experiments on solid ozone?

wikipedia states that solid ozone is violet black in colur and so is my textbook, but when you search up for solid ozones, there are no pictures or experiments done in youtube. Was the colour or the ...
SHADOW LEGEND's user avatar
-1 votes
1 answer
110 views

What's the practical use-cases of Raoult's Law?

So, I am taking my first chemistry class and I started learning about Raoult's Law and it states that, when a non volatile solute is added to a solvent, the vapor pressure of the solvent decreases in ...
Tommy's user avatar
  • 11
2 votes
1 answer
113 views

Understanding Rossini and Frandsen experiment for measuring $(\partial u/\partial P)_T$?

In another question, I asked about the theoretical justification for the experiment that I will describe in what follows. The experiment was done by Rossini and Frandsen in 1932 at the National Bureau ...
xoux's user avatar
  • 144
2 votes
0 answers
53 views

High-temperature interactions with salts on nichrome wire

I'm working on creating aluminium-doped zinc oxide (AZO) thin films, but instead of the usual glass substrate, I want to try this on a fine nichrome wire. I'm using a mix of zinc acetate $\ce{Zn(...
Thomas Pluck's user avatar

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