Questions tagged [equipment]

Questions regarding the equipment used in labs (such as flasks, tubes etc.), their operation and maintenance.

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5
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1answer
287 views

A chamber to control concentration of a vapor: Is there a name for this equipment?

Mechanical engineer here so please excuse me if my question seems dumb to you! I want to have a chamber $(\approx 40 \times 30 \times \pu{30 cm})$ to control concentration $(\pu{ppm})$ of a flammable ...
2
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0answers
54 views

Is it possible to fractionally distill a compound made up of substances with very similar boiling points?

Let's say I have a solution that is made up of substances that have very similar boiling points, say less than 5 degrees apart. Is it even possible to fractionally distill those substances, say, using ...
2
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1answer
117 views

What is this glassware between flask and condenser to collect liquid?

I've been trying to identify this piece of glassware for ages now. I've been combing the internet and can't seem find anything similar. It looks like some kind of adapter/collecter/trap that sits on ...
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2answers
80 views

Do dyed-alcohol thermometers tolerate cold/hot stems?

How do the red organic solvent thermometers respond to having the tip submerged while the stem is at a different temperature? I understand mercury thermometers could easily handle this, and bimetallic ...
8
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1answer
210 views

Why is there a bulge at the top of my volumetric flask?

Sometimes volumetric flasks are designed with a bulge in the neck right below the stopper opening. What is the design intent of that bulge?
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0answers
30 views

What is the most simple way to cut through a steel with very thin aluminum coating to obtain cross section without damaging the coating?

I needed to take cross section characterization of an aluminum coating. I tried to use a hand saw to cut through it, but it destroys the coating, and usually is separated with the substrate as I ...
7
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0answers
576 views

What is the fabric in heating mantles made of?

An ordinary lab heating mantle often has a white fabric coating for the flask compartment, which looks like an inorganic fiber: Image source I'm pretty sure that for some time in the past ...
4
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3answers
2k views

Why did my glass pot explode when I boiled sugar in it and added cold milk?

I decided to try some cooking with sugar and put a glass bowl on the flame with half a cup of sugar in it and some water. After bubbles appeared I stirred the sugar for about a minute and then I ...
3
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1answer
101 views

Is it okay to heat a test tube for several minutes for evaporation of solvent inside?

I have a mixture of water and a small amount of undissolved solute in a test tube. I want to remove the water in it by evaporation method. Can the test tube carries the evaporation process with a ...
3
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1answer
72 views

Help identifying glassware

I am helping clean out my lab and there is some glassware that I can't identify. Attached are the photos: Thank you!
7
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1answer
1k views

Ductless fume hood for acetone?

Administration on my campus has become worried about the lack of a fume hood when using acetone in the 3D Print Club. I'm helping in the process of picking one out. They do acetone vapor smoothing on ...
1
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1answer
117 views

Ultrasound absoprtion by polypropylene beaker for HF acid

In my Ph.D. research, I need to carry out an etching of glass samples in HF acid. I use an ultrasonic bath for the experiment, but to avoid corrosion of steel I put a small plastic (polypropylene) jar ...
17
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1answer
1k views

Conventional heating compared to microwave heating of chemical reactions

In order to try to increase yield of my cross-metathesis, it was suggested to carry out the reaction in the microwave (a lab microwave, not a kitchen microwave). The rationale for this was that ...
2
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2answers
98 views

Choice of equipment for distilling

I need to distill some reagents, and the book Purification of laboratory chemicals suggests first refluxing over $\ce{P2O5}$ for several hours before distilling across. The obvious choice is a ...
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3answers
2k views

What are the plastic connectors called (for glassware)?

I can't remember for the life of me, and google isn't making it easy. e.g. the things labeled 24/40 etc., as in this picture:
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0answers
279 views

Can Pyrex laboratory grade glassware be heated on a stovetop?

I don't have access to a hot plate, I was wondering if Pyrex glass can be safely heated on a stove top. It isn't an open flame, it's a radiant stove top with an electric coil underneath a smooth ...
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0answers
229 views

What is substance that has high melting point in its powder form?

In laminated glass bending process 2 glass sheet will be superposed in a furnance.The seperation powder will be interposed between layer for avoid 2 glass sheet being bound together. I'm trying to ...
2
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1answer
155 views

What is the correct way to transfer large volumes of chemicals?

I am an engineer starting a film developing and processing lab in my house for personal use. I am currently using a bathroom, and am concerned about contaminating my chemical process and the bathroom ...
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0answers
495 views

Does this wire gauze contain asbestos? Can I tell visually?

I bought a wire gauze which claimed to be made of ceramic, and asbestos-free. However, I bought it from Amazon (not a trustworthy source), and I see fibers around the edge of the center. Is there a ...
0
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1answer
58 views

What is the name of this 3 open tube and where can I purchase one?

I would like to do some plasma activated water tests. Does anyone know the name of this three open tube along with where I can purchase one? The screenshot came from this video if you need a ...
3
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1answer
6k views

Purpose of an Iodine Flask

Is there any specific reason why Iodine Flasks are used instead of Erlenmeyer Flasks when doing Iodine Determination tests? Iodine Flasks are quite expensive when compared to Erlenmeyer Flasks. Does ...
2
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0answers
169 views

Alternative to mercury bubbler for increasing boiling temp?

A common reaction for forming the octachlorodirhenate(III) anion is to heat tert-n-butylammonium perrhenate in benzoyl chloride at 209 ºC. If you look up the info for benzoyl chloride, one sees that ...
16
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2answers
2k views

pH probe bulb - what is happening within the glass?

I am trying to understand how the glass bulb of a pH electrode of a pH meter works - the glass bulb itself. Not the reference electrode or the rest of the electrode (HCl, Ag/AgCl wire, etc...), the ...
4
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1answer
195 views

Detecting a gas molecule moving through a small pinhole

Suppose I have the four DNA base chemicals - thymine, adenine, cytosine, and guanine. Imagine I turn each of them into a gas, make a "cartridge" of the gas for each chemical, and then have a "pinhole" ...
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1answer
824 views

How can I remove water vapor from an airstream without a cold trap?

I'm trying to perform vacuum distillation at home with a rotary vane vacuum pump. In order to not ruin my vacuum pump, solvent vapor (in my case, water) should be removed from the air before it ...
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0answers
1k views

What drives the cost of Raman spectroscopy? [closed]

Raman spectroscopy setups are quite expensive- \$10-\$30k seems pretty common. The spectrometer, the probe/fiber cable, and the laser are typically each $3k+. The spectrometer could potentially be ...
7
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1answer
365 views

What are these upside-down glass egg-shaped containers for?

I took this picture from a chemical vendor, but I've seen these things many times already. How are they called and why are they upside-down?
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0answers
71 views

What kind of glass glue can replace silicone?

I tried to put the 'Ferrofluid' and the clear liquid in a large glass tank. My glass tank was bonded with silicone. However, silicon reacted with 'Ferrofluid' ('Ferrofluid' became sticky and hardened)....
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11answers
3k views

Help me identify this glassware!

I'm a freshly graduated physics and math teacher moved into a small school from the late 1920s. The equipment here is old and confusing, at the very least. I have found many things which I have ...
7
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1answer
5k views

How many decimal places should a volume measurement in a beaker include?

I have a beaker which goes up in $0.5~\mathrm{mL}$ increments and my teacher told me that my measurement $(15.50~\mathrm{mL})$ was incorrect, and instead the answer was $15.5~\mathrm{mL}$. I don't ...
11
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3answers
7k views

Why is the outermost part of the Bunsen burner flame not the hottest region?

Why is the blue flame the hottest on a Bunsen burner? I thought the outermost part of the flame must be the hottest region because of complete combustion of gases taking place there. Where am I ...
1
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1answer
57 views

Washing glasswares [closed]

What do most labs use to wash their glasswares? I usually use plain clothes detergent. But, I'm starting to suspect that there are residual detergent even though I've brushed the glassware; rinsed it ...
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1answer
6k views

What kind of materials are plastic syringes made from?

I'm trying to figure out what kind of materials my disposable plastic syringe is made from. I have a Medefil MIS-1130 syringe and when I visited the company website I couldn't find any information on ...
4
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1answer
317 views

What is this device? (Constant level device?)

Found this in my lab on a random shelf (water quality lab). It is old enough that nobody knows where it came from. I think it's a constant level device. It has in- and out-flow connections, as well as ...
1
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1answer
36 views

Why bath sonicators don't come with adjustable power setting?

All the bath sonicators I saw online don't have a power level setting. (Probe sonicators, on the other hand, do have a power setting.) Why is that?
10
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2answers
589 views

Use of pipette during experiments for determination of oxygen by Winkler's method

We were performing estimation of $\ce{O2}$ by Winkler's method and we were told by the instructor that while adding $\ce{MnSO4}$ and $\ce{NaOH}$ / $\ce{KI}$ the pipette tip should be well below the ...
20
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1answer
2k views

Does anyone know what this piece of glassware is?

I recently found this piece of lab glass with a jacket and spout. It says eubilicmeter but I cannot find any information about it online and I do not know what it is supposed to do. It is hollow in ...
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0answers
344 views

Possible Method for Testing Ammonia (and Nitrite/Nitrate) Concentration in Water

I am designing an automated system testing device for my high school's aquaponics club. We need to test for a number of ion concentrations, including ammonia and nitrite/nitrate. In my research, the ...
3
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1answer
239 views

Solvents for tartrates / tannins that won't attack glass

At the bottom of my wine decanter (which due to its shape is fantastically hard to clean mechanically) a layer of reddish brown precipitate forms. I believe this is probably potassium bitartrate ...
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3answers
8k views

How to judge accuracy and precision of measurement devices?

I am unsure about the accuracy and/or precision of measuring instruments. For example, if we have a graduated cylinder, a pipette and a beaker, how and why can we assert them that they can be used ...
1
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1answer
490 views

Piece of equipment similar to syringe for gas collection

I'm looking for the name of a piece of equipment similar to a syringe. The only difference is that this item is made entirely from glass. The purpose of this equipment is to collect gases. Here is a ...
6
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3answers
27k views

What's the difference between pipettes calibrated “TD”, “TC”, “Blow-out” and related terms?

I've never blown-out the last drop of any glass pipette I've ever used during my undergraduate studies. Recently I re-read some notes I had lying around in order to prepare a class I had to give to a ...
3
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0answers
142 views

What is this “bulbous”/“blood sugar” test tube used for?

I was at an antique and bric-a-brac store, and I found several pieces of glassware. They were pretty cheap, so I purchased some of the more interesting ones. Among them were a few somewhat strange "...
17
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1answer
678 views

Unknown glassware

I recently found a piece of older glassware in our lab and nobody seems to know what it is. It appears to be some sort of condenser; however, it does not have both the in and out little notches on it. ...
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0answers
46 views

Automated chemistry test machines? What is currently done, and what is research leaning towards?

There are small and large chips and machines to effect admixtures,blends, fusions of different chemicals into a variety of test samples, and there are machines to measure many vials of all kinds of ...
6
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2answers
90 views

Kipp's apparatus with powders

A Kipp's apparatus has three distinct bulbs. The topmost one contains a liquid and a tube to the bottommost one. The middle one contains a solid to react with the liquid. This is very understandable ...
2
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2answers
58 views

Is there a way to counteract the problems with weighing hot objects?

I am currently performing an experiment in which it would be greatly beneficial to be able to accurately measure the mass of a hot object without waiting for it to cool. The current plan is simply to ...
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1answer
505 views

Condensation of Ethylene Glycol

I'm looking to reflux a 250 mL of ethylene glycol solution. Would an Allihn condenser be suitable; if so what length?
2
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1answer
1k views

Is this Boiling point apparatus?

I have some chemistry equipment but I am not sure what it is for; I think it may be apparatus for measuring elevated boiling points. I have included a drawing of how I think it should go together. ...
14
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2answers
2k views

Why does KCl come in amber coloured bottles?

I remember from school that photosensitive chemicals are kept in amber coloured bottles. Is KCl photosensitive? I read up the impurities list on the bottle and it says that it may have bromides too? ...