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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23 views

Relative humidity at constant temperatures [closed]

It’s known that Relative humidity = (water pressure in a certain volume/ saturated water pressure in the same volume)* 100% “at the same temperature” So my question is why does the amount of water ...
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78 views

Is honey a good choice for chemistry senior essay? [closed]

I am doing my senior essay on chemistry and I was interested in honey, the only thing that's scaring me is that my content is more of biology rather than chemistry, in other words, does honey involve ...
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What happens when sodium aluminate reacts with sulfuric acid? [closed]

I added concentrated sodium hydroxide to an aluminium foil, and later added water after the reaction ended. The solution which I thought was aluminum hydroxide. But after testing it with acid, the ...
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16 views

It's an electrochemistry question [closed]

Molten aluminum iodide is electrolyzed using graphite electrodes: -Write the overall electrolytic cell reaction (physical states are required).
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1answer
36 views

Honey moisture and increase in temperature? [closed]

I've been interested quite lately on how moisture would be affected as the temperature increases. My experiment methodology is that I will be manipulating temperatures of the honey between 20,40,60,80 ...
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2answers
60 views

How to identify if a material is perovskite or not?

This is more of a materials science question, but I believe many of you have referred NIST Inorganic Crystal Structure Database (ICSD) database. I am collecting a database of perovskite materials and ...
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2answers
67 views

How come we can't use the equivalence point equation of NV=NV in this problem?

So, the problem is you prepare to standardize a $\ce{Na2S2O3}$ solution. $\pu{32 mL}$ of $\ce{Na2S2O3}$ solution is titrated into $\pu{50 mL}$ of a $\pu{0.01 M} \ \ce{KIO3}$ solution to reach the ...
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0answers
16 views

Nernst equation for mixed cathode battery

What is the Nernst equation for a mixed cathode battery or a cell where there are multiple half reactions? I assume it is similar to unequal voltage connected in parallel? https://youtu.be/XoLzn49IZjM ...
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FAIR Data Implementation in a Corporation

I'm thinking about trying to introduce the principles of FAIR (Findable Accessible Interoperable Reusable) data into the company where I work. refs/links https://iupac.org/fair-data-in-chemistry/ ...
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2answers
488 views

How to measure the color of honey? [closed]

After doing some research, I found that honey's color could be a factor of climate. I am very interested in this subject and I'm a high school student so we don't have as much apparatus as you would ...
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1answer
35 views

if we mix bleaching powder in water will this be converted to Sodium Hypochlorite? [closed]

if we mix bleaching powder in water will this be converted to Sodium Hypochlorite ?
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1answer
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Is bleaching powder same as Sodium Hypochlorite? [closed]

i want to know is Sodium Hypochlorite is same as bleaching powder. can some one please let me know.
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Deviation from ideal gas law curves

So I was reading through my textbook on deviations from an ideal gas, and they had plotted a curve of experimental PV/nRT against the pressure. They talk a lot about why the volume is really smaller ...
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What are some Qualitative test/s that you can use for benzophenone? [duplicate]

I have determined one of my unknowns to be benzophenone and in a lab setting (but that isn't possible because of COVID-19) I would conducted the 2,4 DNP test which should yield a positive result. ...
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1answer
58 views

Calculation of the cell potential of a lemon battery experiment

I have the following problem that I would like to get checked. I’m told to calculate the cell potential of a simple lemon battery experiment. After Finding out the oxidizing agents and the reducing ...
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Is it ideal to use a Zahn cup to measure the viscosity of honey?

I am a high school student, and I'm looking for the ideal way to measure honey's viscosity. unfortunately, we do not have a viscometer so I cannot use that but I made some research and the most ...
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50 views

What is the recipe for the Belousov-Zhabotinsky reaction for correct simulation with the Oregonator model? [closed]

For a school project I'm trying to model the Oregonator and perform some experiments with the Belousov-Zhabotinsky reaction. Like predicting the reaction and the swings in concentrations. For that it ...
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24 views

Order of adding reactants on growth of Cu

I am reading the following paper which details the steps to control growth of Copper. They fabricate Copper powders from $\ce{CuNO3, NaOH, and C6H8O6}$. Specifically, in this paper they add the sodium ...
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1answer
39 views

does stirring honey make it less viscous? [closed]

After making some research, I found that crystallized honey does get less viscous as we stir it, so is it the same thing with pure honey or not? and also if not could we use the Zahn cup experiment to ...
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2answers
92 views

How to determine the iron content of a screw?

In Analytical Chemistry, I was asked to determine the iron content of a screw. I thought it could be solved in the following way: Treat the screw with a solution of sulfuric acid or hydrochloric ...
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1answer
39 views

Main industrial method for producing ethyl ethanoate (acetate)? [closed]

I am aware there are various methods, however, which is most prevalent in industry? Researching on Google has indicated Fischer esterification or Tishchenko reaction and other versions. Which is most ...
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1answer
39 views

can i synthesise Bis(tri-tert-butylphosphine)palladium(0) from Sodium tetrachloropalladate and tri(t-butyl)phosphine [closed]

can i synthesise Bis(tri-tert-butylphosphine)palladium(0) from Sodium tetrachloropalladate and tri(t-butyl)phosphine if so how do i isolate the product
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1answer
158 views

DIY Hand Sanitizer Clumping [closed]

Hand sanitizer is impossible to find around me and I have 4 family members who are essential and not around a sink or soap during their work day (delivery drivers), and they are out. I make a lot of ...
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1answer
22 views

Procedure vs. synthetic method?

I am genuinely confused on the difference between a procedure/flow chart and the synthetic method for a lab report and what exactly a synthetic method includes, and I can't find any information online....
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1answer
60 views

Cooking IN CO2 gas? [closed]

Quick theoretical question: What if I replaced water with dry ice in my pressure cooker? Assuming I used a calculated amount to prevent an explosion... Would It be able to cook? Would it dehydrate ...
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Why is the experimental pH of vinegar (acetic acid) so much higher than expected?

I bought some sodium hydroxide on Amazon and went about titrating solutions I make with it. As I'm an amateur chemist at home, I have limited tools. A pad of paper, some 5% acetic acid vinegar, and ...
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1answer
43 views

What is the relative rate of diffusion of ammonia to hydrogen chloride, both in gaseous states? [closed]

I encountered this problem during an assignment: I answered it as C, but the assignment grader marked it as wrong and indicated that A is correct. I asked another instructor about it and gave me a ...
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1answer
49 views

what catalyst to use for the reaction between AgNO3 and NaCl? [closed]

What is the best catalyst to use for the reaction between AgNO3 and NaCl that would result in a change in activation of energy so therefore more precipitate formed. Please give me the ways I can ...
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1answer
47 views

How can I make AgNO3 more basic? [closed]

Is there anything that I can add to the AgNO3 solution that will make it more basic without forming a precipitate such as reacting with OH or HCl? Please be more specific and give an example.
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1answer
66 views

Significance of shapes of Conical flask and Kjeldahl flask

What is the practical significance of the shapes of conical flask and Kjeldahl flask?
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3answers
77 views

What is the best way to make a substantial amount of soot in a high school laboratory?

I need to make about 50 grams of soot (carbon black particles) in a high school laboratory. What would be the best way to do this? The purpose of needing 50 grams of soot is because I would like to ...
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1answer
48 views

How to store small amounts of gas

I need to store small amounts of gas. I already saw devices that look similar to the image below, but I don't know how they are called. Does someone here know how these devices are called? I am also ...
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1answer
103 views

Preparation of potassium cyanide from potassium ferrocyanide via HCN

Does anyone have any experience with the preparation of potassium cyanide from potassium ferrocyanide via $\ce{HCN}$ method? I did some math and am going to proceed eventually, any advice would be ...
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1answer
52 views

laser diode problem [closed]

I'm a student studying chemistry, i'm working with diode laser to look at emission spectra for certain complexes. i'm using integrating sphere as my setup, when i use the 405nm diode laser output of 4....
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2answers
71 views

The burning candle - rising water experiment

This is a classic experiment. On a plate with a little water place a candle and light it. Place a drinking glass over it. The light goes out while sucking up the water. At least two things happen: ...
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1answer
41 views

Is it appropriate to call this material a hybrid composite? [closed]

The material I've synthesised is made up of two primary parts at a 1:1 ratio: Part 1: agar, glycerol, water. Part 2: polyurethane resin. The agar mixture on its own was too soft, so I added the ...
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3answers
681 views

How to control current and voltage in electrolysis

I am doing an experiment that aims to determine if the rate of electroplating changes with the temperature. I am using a copper rod, a solution of copper(II) ions and a neutral rod to be coated. I ...
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2answers
40 views

Particle size vs dissolving rate of sucrose

I’m required to make a lab with this information only (particle size vs dissolving rate of a solid (molecular covalent compound-sucrose)? so far what I’m thinking is using three different kinds of ...
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1answer
126 views

Why does the test tube face downwards in gas production?

In the preparation of $\ce{NH3}$ from $\ce{NH4Cl}$ and $\ce{Ba(OH)2}$, my teacher said that when heating the test tube, the test tube faces downwards as opposed to upwards. Why is this so? Wouldn't ...
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1answer
55 views

How does one determine whether a chemical requires hazardous waste disposal?

It is pretty easy to find information about the actual hazards of a chemical in the SDS, but I have been struggling to sort out which classifications require that the compound be handled differently, ...
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1answer
77 views

Is there any collection of charge density maps for small molecules? Any good data at all?

Despite wide variety of existing experimental methods producing electron/charge density maps, I failed to find a good dataset of experimental data for small (1-3 atoms) molecules. There are datasets ...
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2answers
53 views

What is meant by position 5' or 3' [closed]

I'm a self-learner that likes to keep up with current research. However, I can't find what is meant by expressions such as 5' or 3' positions on chemical structures. But , in particular, what is meant ...
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1answer
40 views

The rate of change in pH v.s Temperature

I have somewhat established that there is a linear relationship between change in pH of carbonic fizzy drinks over time. I also realise that the pH increases linearly faster for the same carbonated ...
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1answer
89 views

Why is absorbance in UV-VIS spectrometer negative even after calibration?

I was collecting data to plot a calibration curve using pure beta-carotene sample. Prepared 5 different concentrations of beta-carotene dissolved in methanol. Pure methanol was used as blank. However, ...
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2answers
415 views

How does pH of soda drink vary with time

Basically I have done an experiment where I measure the pH of my soda drink at a specific temperature over $\pu{45 min}$. At every temperature, the $\mathrm{pH}$ of my soda drink increases, but much ...
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0answers
26 views

Why does peak decoupling occur in H-NMR spectra?

For example, when we analyze the conversion of some chemical compound, certain characteristic areas tend to decrease (ok). However, why can a peak (i.e., one peak) generate smaller peaks (i.e., more ...
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2answers
141 views

Reaction between copper (II)chloride and aluminium foil [closed]

When I reacted copper chloride and aluminum foil instead of getting the brown color I got green color. Can anyone share their procedure where the experiment actually succeeded?
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0answers
43 views

How to determine the pH of citrate buffer system

I used this table (http://microscopy.berkeley.edu/Resources/instruction/buffers.html) to make a citrate buffer system. The Pka value is 6.4, and I multiplied the solution by ten to make a larger batch....
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1answer
37 views

How is silica gel made? [closed]

How is silica gel prepared from sand (after extracting it). How many ways can it be used? Is there a way to make it without an oven?
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1answer
80 views

Fractional index in a chemical formula of metal oxide

I have just read an article in which they used $\ce{WO3}$ and $\ce{WO_{2.9}}$ as precursors, whose objective was to form $\ce{WS2}$, in an atmosphere of argon by CVD. In one boat there is the powder ...

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