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.
-1
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0answers
12 views
Copper sulphate and Postassium iodide Reaction [on hold]
I understand that CuSO4(aq) + KI(aq) → CuI2 + K2SO4
When I conducted the experiment, premixed solutions were used and there was no visible reaction at all. Everything was measured correctly, but due ...
-2
votes
0answers
14 views
Buffer capacity of acetate [on hold]
I am trying to calculate the buffer capacity of an acetate buffer made with 50mL 0.4M acetic acid and 0.4M sodium acetate. it's initial pH was 4.67 and we are adding 0.2M of NaOH and 0.2M HCl to a ...
-1
votes
0answers
23 views
Why does the pH of a reaction between magnesium and hydrochloric acid stay the same?
I did an experiment where I reacted magnesium with hydrochloric acid and tested the pH of the solution at the beginning and at the end. My pH paper told me that the pH did not change or at least very ...
10
votes
1answer
407 views
What is the role of ammonium chloride in the workup of a Grignard reaction?
In the following Grignard reaction, why is aqueous ammonium chloride used to get to the products? I don't see how it participated in or modified the reaction from what is normally expected.
-2
votes
0answers
20 views
How Can I make Make 0.1M Mercury nitrate solution? [on hold]
I dissolved 14 grams of Mercury nitrate dihydrate in 200 ml water and diluted to 250 ml.
the solution is cloudy and seems that is not dissolved. any suggestions?
0
votes
2answers
32 views
How Can I Induce Corrosion Electrochemically?
I'm very interested in measuring corrosion in metal alloys, particularly in salt solutions. I understand metals corrode over time, however, I was wondering if it's possible to electrochemically "speed ...
0
votes
0answers
14 views
How do I make a 0.5 M citrate buffer at pH 4.5?
I need to make a citrate-sodium citrate buffer at 0.5 M concentration and pH 4.5. I calculated the molarities of the citrate and disodium citrate based on the Henderson Hasselbalch equation, using a ...
1
vote
1answer
27 views
Can an iodine clock reaction work without using a strong acid?
I'm going to do an iodine clock reaction for a project and we had to submit the materials and safety sheets for the experiment a while ago. I thought I could do one by using hydrogen peroxide, sodium ...
1
vote
1answer
33 views
How to effectively wash the precipitate or crystals on the filter and why?
My lab manual says that the precipitation on filter should be washed with a few small portions of the washing liquid. Why can't I just completely fill the filter funnel with the solvent instead of ...
1
vote
1answer
21 views
vapor pressure of one part of binary compound
Let's say we have a binary compound AB in an enclosed container, and let's say there's a tendency to form B-vacancies so that B atoms/molecules escape and form a vapor. Let's assume there's enough of ...
0
votes
0answers
20 views
Metal colored flame and safety
For Chrismtas I was a given a wonderful gas lighter, that produced a pink flame by heating small metal pads (when the pads are cold, the flame is blue, once they are red hot, the flame is colored).
...
1
vote
1answer
50 views
Hydrogenation of 1-hexene with Raney nickel
For my high school senior chemistry project, I need to create and perform a lab. I've chosen to do the hydrogenation of 1-hexene with the catalyst of Raney nickel.
I'm struggling because I'm not ...
-1
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0answers
31 views
Measuring activation energy without changing temperature
Does anybody have an alternative approach to finding activation energy of a reaction without using Arrhenius plot?
Using Arrhenius method involves changing temperature at which the reaction occurs ...
0
votes
1answer
17 views
Suitable safe cleaning solution for aliphatic urethane
I am looking for a suitable cleaning solution for a sprayed on coating that is an acrylic aliphatic urethane. My end goal would ideally be something that can neutralize rust, whiten and brighten the ...
0
votes
1answer
13 views
Taking a procedure for ICP and adapting it to use with AAS
I was reading a paper regarding metal detection and they gave their procedure for an acid digest of a soil sample which was then analysed by ICP-OES.
They used nitric acid, hydrogen peroxide and ...
1
vote
0answers
29 views
Preparation of Saturated Salt Solutions - W/O Being Wasteful
Question
What is the most cost effective way to prepare saturated solutions of each of these compounds? LiCl, K2CO3, and NaCl.
Background
I am trying to create a rudimentary controlled humidity ...
2
votes
0answers
22 views
XRD-Amorphous materials
I am interested in sealing some air-sensitive samples inside of xrd-amorphous material to allow for XRD and hopefully XRD-texturing analysis. Of course, Kapton is the common material used for this ...
-3
votes
2answers
31 views
What's the use of adding 73 mM H2O2 to a supertanant? [closed]
Enzyme assays
Determination of catalase specific activity
The CAT (EC 1.11.1.6) enzyme activity was measured according to Gallego et al.38 Plant samples were grinded in $\pu{0.1M}\ \ce{...
-1
votes
1answer
18 views
Dilution of Concentrated TiCl4 using deionized water [closed]
How can we dilute conc TiCl4 (>99%) to 20 % w/w, using only DI water?
2
votes
0answers
29 views
How to Separate Copper Nanowires in an Alumina Membrane
So, in my Chemistry Lab we had an experiment to use Whatman alumina membranes and GaIn eutectic to create Nickel nanowires through electrodeposition. So essentially Nickel wire electrode and alumina ...
-3
votes
1answer
37 views
I need some help on this Chemistry question can any one help please!! I need to find the cost of a single atom of aluminum [closed]
A 75 ft2 roll of aluminum foil costs $3.79. A 12"x12" pieces has a mass of 1.0 g. How much does a single atom of aluminum cost, in dollars?
i need to show all my work i am so lost.
0
votes
1answer
33 views
Is it possible to displace cerium from cerium sulphate using aluminium to get pure cerium metal?
I'm unable to find cerium any reactivity series, hence the question..
0
votes
1answer
63 views
questions about the synthesis of iodobenzene from aniline
I am conducting an experiment about synthesis of iodobenzene from aniline, referring to this site(and various sites) (http://www.prepchem.com/synthesis-of-iodobenzene/). Below is my experimental ...
0
votes
1answer
33 views
Troubleshooting electrochemical batteries
For my science classes, I have built multiple types of electrochemical batteries utilizing oxidation-reduction reactions, and I have demonstrated that they each produce potential difference across the ...
1
vote
0answers
52 views
Confusions regarding porous pot experiment
So, I have studied about the porous pot experiment.Although I did understand the concepts of water level falling and rising due to difference in RMMs and thus difference in rate of diffusion, I ...
-1
votes
1answer
32 views
How to distinguish between an insoluble ionic compound and an insoluble metallic compound? [closed]
Insoluble ionic compounds and insoluble metallic compounds could both have high melting points, insolubility, and no conductivity in water. Is there a way to distinguish between the two in a ...
0
votes
3answers
53 views
Is there a way to oxidize salicyl alcohol to salicylic acid without using chromium trioxide? [closed]
I'm doing a project for school and I need to convert salicyl alcohol to salicylic acid, but I'm not allowed to use $\ce{CrO3}$ because of its toxicity. I know it is also possible to oxidize a primary ...
1
vote
1answer
39 views
Diluting topical cream (10%)
I need to dilute a face cream with 10 % active ingredient to 2.5 % and 5 % but I am confused as to how. I looked into the $$c_1V_1=c_2V_2$$ and $$\text{concentration of a solution}=(\text{amount of ...
-1
votes
1answer
45 views
Is the relative humidity of pure water vapour 100%?
If there is pure water vapour in the gas phase, can the partial pressure be taken to be equal to the vapour pressure of water at that particular temperature?
edit: How is relative humidity calculated ...
-1
votes
1answer
13 views
If copper becomes copper oxides because of oxygen in the air, is it a competing reaction? [closed]
If copper becomes copper oxides because of oxygen in the air, is it a competing reaction?
My science class made pure copper with a simple displacement reaction. We let it set on the window to let it ...
2
votes
1answer
48 views
How could I produce/rig this flame-colour lottery?
Not sure if this is the wrong SE for this, happy to move it if not...
In the Netflix TV series Sabrina, there is a scene where people take part in an appropriately-gothic-and-ominous lottery, which ...
1
vote
1answer
31 views
How to assess sunscreen effective via blueprinting?
How do I assess the effectiveness of sunscreen creams by using the blueprinting process? I know blueprinting is done when something is sensitive to light and this may cause reactions to produce a ...
0
votes
1answer
58 views
How to remove MEHQ from Methacrylic acid monomer without reduced pressure distillation?
I am aware that the standard way to remove MEHQ from Methacrylic Acid is to perform reduced pressure distillation. The papers I see suggest using ~ 10 Torr pressure to perform distillation. Sandler's ...
0
votes
1answer
38 views
Extrapolating from a calorimetry lab to find a new delta T with different volumes and grams of substance
So, we just finished an AP chem lab where the question was basically:
Given the results of the lab were that $\pu{5 grams}$ of $\ce{CaCl2}$ and $\pu{45ml}$ of water produced a $\pu{13.33 ^\circ C}$...
-1
votes
0answers
129 views
Mechanism for the oxidation of a secondary alcohol (with acidified KMnO4.
I'm doing an experiment soon where I have to oxidise 2-heptanol to 2-heptanone. The first part of the experiment involves a work up wherein I have to first add acid then my potassium permanganate ...
0
votes
1answer
16 views
How to measure and transfer suspensions?
I need to measure and transfer 10 ml of a fairly dilute suspension at a time to another container.
But no matter how diligently I do it, sedimentation happens quickly after mixing and successive ...
0
votes
1answer
26 views
emulsion - why does it make a differnce if you have have more/less water/oil
So I have been wondering why you can see the following:
Using 10 ml oil and 1 ml water with and emulgator leads to a way better emulsion than if you use 10 ml water with 1 ml oil (if you use the ...
1
vote
0answers
35 views
Acid-base extraction lab exercise
I have a solid mixture of trans-cinnamic acid and menthol. I’m new to this organic chemistry business and I don’t know if I can react the acid directly out of the solid mixture with a basic solution ...
-1
votes
1answer
17 views
How to loosen up Tris HCl?
I have this bottle of Tris HCl that I need to use and apparently it's all hard. I don't have time to get a new bottle since this is needed for a lab for tomorrow and this is all I was given. Is there ...
0
votes
0answers
14 views
Efficient ways to make perovskite solar cell crystals
I'm a high schooler involved in a research in which we aim to grow perovskite crystals in microgravity. I've recently come across this article in which they explain how to grow better perovskite ...
0
votes
1answer
51 views
Protection of Alcohol
I carried out an experiment and it goes like this:
2-bromoethanol + dihydropyran (DHP) ---> 2-(2-bromoethoxy)oxane
Acidic ion exchange resin was added alongside as a source of H+ ions (catalyst).
...
4
votes
1answer
94 views
Melting of ionic compound hydrates
My professor asked us the reason of the melting point of potash alum being so low, despite it being an ionic salt. He later went on to answer it by saying that melting point is a misnomer for the ...
1
vote
0answers
62 views
How to decide if a salt is soluble in water through mere pen and paper [closed]
In the laboratory we are given numerous salts for analysis for cation and anion.
How can one decide which combination of cation and anion cannot form soluble salts in water so that after detecting an ...
1
vote
1answer
32 views
Can sucralose form a syrup?
(Almost) Everyone is familiar with making simple syrup from table sugar and water.
I was wondering if pure sucralose is also capable of forming a syrup.
I wanted to do an experiment myself, but to ...
5
votes
1answer
380 views
Reaction of chloroform, resorcinol and strong base
A common reaction used to identify resorcinol (benzene-1,3-diol) in the laboratory is to react it with chloroform in presence of 30% sodium hydroxide (NaOH). A red coloured solution (or precipitate) ...
0
votes
0answers
31 views
What does “off-hue” constitute in the context of analyzing a sample using the Pt-Co color scale?
ASTM D1209, the method describing how to perform the Pt-Co color scale test for a sample, recommends reporting material that can't be matched to a particular standard as "off-hue". For color based ...
2
votes
2answers
119 views
Can chiral atoms have same substituents but with different orientations?
So consider this molecule. We have to determine whether nitrogen atom is chiral or not.
MY IDEAS:
Now going by all I have read, for chiral atoms only criteria is substituents to be different. Here ...
0
votes
0answers
11 views
Phosphorus, nitrates and potassium removal from wood used for water fountains
I want to ask how to expedite the leaching of chemicals from wood used for making water fountain bases. I believe the chemicals that turn the fountain water brown are phosphorous, nitrates and ...
1
vote
1answer
47 views
How can I prevent the effervescence of a solvent during evaporation? [closed]
How can I prevent the effervescence of a solvent like petroleum ether when I evaporate it on a water bath?
0
votes
1answer
47 views
Evacuat powders? [closed]
I do not know weather this is the right place for asking such a question as it is more about lab procedure then pure chemistry.
Anyways, here comes my question. I would like to evacuate a vessel (...
