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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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3 views

Detection of an element within a sample

I've got a highly chaotic reaction pipeline involving millions of side products, some of which contain a given element, some of which don't, spread across hundreds of samples based on various ...
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14 views

HYGROSCOPIC AND HYDROPHOBIC MATERIALS [on hold]

(1). I'd love to know another material that exhibits both hygroscopic and hydrophobic properties like polyamide. (2). If there is such a material, can it be placed side by side or on top of polyamide
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1answer
37 views

Can you achieve plasma charge? [on hold]

This question might be too common, but I'm very curious to understand and find out if this is possible. We see a lot of sci-fi movies and TV series where they have plasma guns, in reality is this ...
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0answers
14 views

FTIR Michelson Interferometer [on hold]

Calculate the change in path length (x) in the Michelson Interferometer required for total interference. (sum = 0) for 200 cm-1.
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0answers
11 views

Question(s) about salt bridge in simple battery cells

What element/compound(s) is a universal salt bridge which I can apply to any simple cell? I am experimenting and confused when I put the right compound, which is always a kind of aqueous solution as ...
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0answers
13 views

What is the standard value of enthalpy of dissociation of hydrated copper sulphate? [closed]

I performed the experiment. But I am not sure about the result. If I could know the standard value, I can verify my result.
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0answers
33 views

What gas would be suited best to form a density gradient in a long tube? [closed]

I want to set up an aero-optics experiment using a sealed ~5 m length of pipe with a gas inside. The gas must form a density gradient, and must be transparent enough to view a target at the other end ...
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0answers
27 views

Calibration curves and dilution factors

I am currently taking a course where we are exploring nitrate concentrations in water samples. We are using a UV-Vis Spectrophotometer and have created a calibration curve in the first part of the ...
-4
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1answer
36 views

Aluminum Oxide + Epsom salt ⮕ aluminum sulphate + Magnesium oxide [closed]

I was wondering that if you wrapped some Epsom salt in aluminum foil and set it on fire would you get aluminum sulphate and magnesium oxide, I couldn't find anything about this on the internet
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0answers
49 views

How to counter crust formation when crystallizing NaCl on the liquid-air interface?

Saturated sodium chloride solutions are evaporated at elevated temperature. The aim of evaporation is to produce hollow pyramid salt crystals. Temperatures used range from 65°C to 85°C. With 80°C ...
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1answer
30 views

Titration/ Separating Soluble Salts/ NaHSO4

When performing titration between NaOH and H2SO4, both Na2SO4 and NaHSO4 are formed (both are soluble in water), is there any method to obtain crystals of NaHSO4? (Maybe by separating two soluble ...
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0answers
37 views

Electric fields in a galvanic cell

I have read hat there is two types of electric fields exist in galvanic cell.I understand E because of charges accumulated on electrodes but what about other E -field? What does cause this field and ...
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0answers
30 views

Balanced equation for Schweizer's reagent production?

In Thompson's Illustrated Guide to Home Chemistry Experiments the chemical formula for Schweizer's reagent is represented as $\ce{[Cu(NH3)4](OH)2}$ (although Wikipedia represents it as $\ce{[Cu(NH3)4(...
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1answer
25 views

ml/min to mol/min [closed]

After completing a continuous distillation experiment, i am trying to convert my feed flow which i set to 30 ml/min and into mol/min to determine a mass balance equation. If i use the equation below ...
3
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0answers
31 views

Molar ratios not leading to complete reaction in Schweizer's reagent production

In my home lab, I've reacted $\ce{Cu(OH)2}$ with aqueous ammonia to produce Schweizer's reagent. However, I'm surprised by the amount of ammonia required to react with this amount of $\ce{Cu(OH)2}$. ...
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38 views

Coffee Degassing

I roast coffee, and currently package it in plastic bags with one way 'degassing' valves. As soon as coffee is roasted, it starts giving off $\ce{CO2},$ a process which continues for days, and ...
6
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2answers
78 views

How to weight picric acid?

Picric acid is stored under a layer of water to prevent an explosion. What is the right way to measure the amount of picric acid that taken out? It is wet and containing water.
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1answer
93 views

Making aspirin without acetic anhydride

I want to make aspirin. Normal method is to react salicylic acid with acetic anhydride, but it is extremely hard to find acetic anhydride. How may I synthesize aspirin with acetic acid and salicylic ...
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0answers
20 views

Iodine Clock Reaction with Iodine Tincture and Tap Water

After unsuccessfully doing an iodine clock reaction at my school and being unable to collect any useful data, my teacher decided not to give me any more lab time. This lead me to have to find an ...
6
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1answer
115 views

Why does thallium hydroxide increase the yield of product in a Suzuki reaction?

I came across a research paper by Uenishi et al. [1] where relative rates of $\ce{KOH}$ and $\ce{TlOH}$ in Suzuki coupling reactions are compared. Thallium hydroxide increased the yield of products, ...
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1answer
28 views

Separation of Methanol-water in a plate distillation column

I conducted an experiment to separate methanol and water. I am trying to determine the mole fraction of the distillate collected but having a little trouble with the calculation. So i had a flow rate ...
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1answer
53 views

Is it possible to make micelles to pick up Microplastics from water?

I'd like to know if I could get micelles to pick up microplastics in water. I read that microplastics are sometimes charged, so can we make the lyophobic end to pick up microplastics, so that they can ...
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1answer
43 views

32 Degree Thermochomic dye [closed]

I am doing a school project which involves color changing based off of temperature, and I need a thermochromic dye that changes color at 32 degrees Fahrenheit. Does anyone know where I could find some ...
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0answers
17 views

Fat polymerization vs hydrolysis and temperature change

I have an experiment on fats that I have to do in a few hours and I am very lost between fat/oil (lipid) polymerization due to high temperatures and hydrolysis. It appears that both result in the ...
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0answers
52 views

Changes in conductivity of CuSO4 solution after NH3 solution is added

In my high school chemistry class we are writing a lab. Originally, I wanted to measure the rate of a ligand exchange reaction at different temperatures by measuring changes in conductivity. After ...
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0answers
29 views

Why do some compounds without carbonyl group give positive 2,4-DNPH test?

I was performing some experiments in Chemistry Lab today in which I had to find the functional groups present in a compound. It being a very basic undergraduate course introducing us to the ...
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0answers
13 views

Protocol during antechamber heating

I recently setup a heating apparatus for the large antechamber in my glovebox (i.e., large amounts of heating tape). Eventually, I want to do bake-outs for my moisture-sensitive chemistries (e.g., ...
0
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1answer
18 views

distilled water and copper(II)chloride [closed]

In class we did a lab of adding blue crystals of copper(II)chloride into distilled water, the water turned blueish green,were the changes chemical or physical?
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61 views

Primitive Technology - Extract Silica and Sulfur from ash

Given some plant ash containing silica and sulfur, we need to find a way to extract the silica and sulfur using only resources available to a primitive person stuck on an island, with access to a ...
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0answers
32 views

Why is the iron inter-system crossing non-negligible at high temperatures?

Inter-system crossing (ISC) is a radiationless process involving forbidden transitions between singlet and triplet state. These are more common with heavy atom molecules, so I understand that ISC is ...
1
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1answer
23 views

Organic solvent for cleaning autosampler syringe

I work in a laboratory where gas chromatography is used extensively. We handle phthalates. What are the possible wash solvent for autosampler syringe? I've been using acetone.
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4answers
579 views

accurate measurement from inaccurate tools [closed]

It is a very general question. Is there a good way to systematically increase the accuracy and precision of a measuring tool using only mathematical means? For example, average 10 measurements can ...
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0answers
47 views

Nessler's Reagent and Lead Acetate Reaction

While performing inorganic salt analyses in the lab, I mistakenly added Nessler's reagent to a solution of lead acetate (instead of ammonium carbonate) in NaOH. A greenish-yellow solution resulted, ...
4
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1answer
65 views

Theory behind Experiment: Extraction and Identification of DNA

A few days ago, in my chemistry lab class, I performed an experiment aimed at extracting and identifying DNA. The class is mostly practical oriented, so I thought of asking my theoretical doubts on ...
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0answers
23 views

What chemistry lab experiements can I do based on the bicarbonate buffer system?

I want to do a chemistry experiment, based on the reactions present in the bicarbonate buffer system. It needs to be heavily chemistry based, rather than biology based-- any suggestions preferably ...
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2answers
59 views

Can you heat something at alcohol bath?

I have a mixture of $\ce{Et2O},$ $\ce{EtOH}$ and water, and I want to distill off the ether. I am using a water bath so not much water is distilled over, as the boiling water is 100 °C, and the ...
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0answers
15 views

Removing potash from water using poly-aluminum chloride

I have been conducting an experiment for a school project, (removing metals from water)I added 50 grams of sulphate of potash to 2 litres of water, then allowed it to dissolve for a 24hrs. On two ...
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1answer
40 views

Is it possible to predict release of acid fumes in certain acid reactions? [closed]

Upon mixing both acids, the reaction between Formic Acid and Sulfuric Acid, besides producing Carbon Monoxide and Water, releases a certain amount of acid fumes. Does anyone know if the fumes, in ...
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0answers
27 views

Measuring change in concentration of hydrogen peroxide

I am conducting an experiment to find the rate constant of the decomposition of hydrogen peroxide, $\ce{H2O2}.$ For this, I was planning on using the integrated rate law: $$\ln(\text{final ...
3
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1answer
31 views

What are the equations giving the molar flow of different molecules linked by a reaction?

Let consider a steady state CSTR in which occurs the following reaction: $$\ce{aA + bB \leftrightarrow cC}$$ Notations: $F_i$ is the molar flow of $i$, $r$ is the rate of reaction, $V$ is the ...
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0answers
21 views

How to remove the foggy discoloration in polycarbonate tubes caused by acetone?

Unknowing that the tubes used in the centrifuge are made of polycarbonate, I cleaned them with acetone. Following, a white smoky discolouration appeared and the tubes turned opaque. Is there any way ...
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3answers
48 views

Why does a NOx container get cold when NOx is released? and What is the relationship of the vapor pressure curve with the liquid-vapor dome?

The temperature at which $\ce{NO_x}$ is in equilibrium with its liquid and vapor phase at 1 atm is about –84 °C. Does that mean $\ce{NO_x}$ exists as a liquid at that temperature? What about it's ...
3
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4answers
137 views

Heisenberg's uncertainity principle(HUC)

I know the mathematical form of HUC and its statement i.e.It is impossible to determine simultaneously. , the exact position and momentum of an electron. i don't know why this ...
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2answers
97 views

Synthesis of potassium trioxalatocobaltate(III) trihydrate

I've synthesized the compound potassium trioxalatocobaltate(III) trihydrate and for it I have two reaction equations. One of them is: $$\ce{CoCO3 + 3K2C2O4.2H2O -> K2[Co(C2O4)3] + 2CO2}$$ and the ...
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0answers
27 views

Plaster of Paris

One of my Chemistry professors said that the hard mass formed after adding water to Plaster of Paris, cannot be converted back into Plaster of Paris. However, he said that the original Gypsum can be ...
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0answers
25 views

error in making a series of standards out of a stock solution

I want to make a series of standards to make a calibration curve. The analyte is a volatile substance so I'll have to use some glass "containers" with a membrane lit so I don't lose too much of the ...
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1answer
37 views

Does aminosugars give positive response in alkaloid tests?

Does aminosugars give positive response to test for alkaloids such as tests with Dragendorff's reagent, mayer's reagent, Hager's reagent, Wagner's reagent etc?
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11 views

In which order should you prepare a microemulsion?

So I have isoooctane (oil phase) ,CTAB (surfactant) ,1-butanol (cosurfactant) , and an aqueous solution of metal nitrates as the water phase. In which order should i add these components? Or any ...
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0answers
44 views

How much ethylacetate is produced?

1 mol of acetic acid and 1 mol of ethanol was mixed to react at a constant pressure to reach the equilibrium, and 0.75 mol of water was found in the product. A. Calculate the equilibrium ...
3
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1answer
129 views

Is there a known relation between the diffusion of a molecule and the diffusion of the reactants?

I have a plasma consisting of elements A and B (which have a similar mass). These elements can react to form molecules AB. $$ \ce{A + B -> AB} $$ Now if my plasma or gas is expanding based on ...