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Questions tagged [equipment]

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

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Why a Differential Scanning Calorimeter (DSC), to measure thermodynamic parameters, has problems?

I want to use a Differential Scanning Calorimeter (DSC) to determine when my protein unfolds as you increase the temperature in a DSC machine. The machine is pressurised (to 3A) during the run, so ...
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1answer
2k views

What's this glassware?

Can anybody tell me what this glassware with a stem, bulb and long tube is?
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1answer
74 views

Name of this glassware?

Could you tell me the name of this glassware? I found it in the laboratory with a label that says "container of stoichiometry", but I have not found more information about it, especially about the ...
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1answer
26 views

Standard for Chemistry Supplies [closed]

In searching for chemistry kits it often leads to stuff like this: I have seen some nicer "boxed sets" for the ~$500 range, but I don't think this is really ideal. This one looks a little nicer. I am ...
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3answers
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How can I get this glass stopper out? Need troubleshooting!

I placed a glass stopper in a $\pu{100 mL}$ round bottom flask while my solution was still warm and let it cool overnight. Now I think I created a vacuum seal and I can’t force the stopper out to ...
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2answers
500 views

Benefits of a Buchner funnel w/ a fritted disc instead of Quantitative Filter Paper Circles

I was wondering if someone could enlighten me on some example us cases where one would be better of using a Buchner funnel with a fritted disc (example), as opposed to a Buchner "style" filter (...
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1answer
839 views

How is polarization of light measured?

Chiral molecules are classified as dextrorotatory (+) or levorotatory (-) depending on whether they rotate plane-polarized light (ppl) to the right or left. My question is, how is such a measurement ...
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How does the “sample type” selection on the MassHunter software for Agilent 7900 ICP-MS affect the quantitative results?

I'm new to using the instrument, and recently I have tried to measure Cr in both the eluent(1% nitric acid) and a method blank (also 1% nitric acid, but after it has gone through the entire analytical ...
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What might be the reason for the longer stem found in some separation funnels?

Most separation funnels have a stem around 50 to 70 mm long (often less if fitted with a ground taper joint) that is used to direct the output into a receiving flask. While the stop-cock has a ...
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1answer
88 views

How to attach soft tubing to glass

I plan to do some amateur chemistry with some basic equipment. I've watched hours of youtube videos for how to bend and polish glass tubing and push it through rubber stoppers, and I've seen diagrams ...
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1answer
59 views

Difference in application between Standard Type Bulb Pipette Filler and Universal Type?

I want to ask what is the difference in terms of application between the HHH (Heinz Herenz Hamburg) Bulb Pipette Filler Standard Type (1081801) and the HHH Bulb Pipette Filler Universal Type (1081802)?...
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1answer
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Pipette Pump durability?

I want to ask, according to your experience, in terms of durability and longevity of the tools, which one of these types of pipette pumps is better? and the reason why? 1) Tri-valve Pipette Bulb 2) ...
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1answer
69 views

When to disconnect tubing in vacuum filtration?

The UCLA site says in step 6 to disconnect the vacuum tubing before turning off the vacuum and the second link from Leeds says in step 11 to turn off the vacuum source first and then disconnect the ...
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1answer
48 views

What are the best cleaning agents for carbon residues on glassware?

Introduction Recenly I wanted to isolate some ascorbic acid (Vitamin C or chemically - $\ce{C6H8O6}$). I've put the filtered solution (I had to filter it because of the binder) in a flask and heated ...
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1answer
57 views

How can I safely store highly outgassing self-pressurizing chemicals?

I have a standard copper etching solution of 1 part $\pu{10M}$ $\ce{HCL}$ and 2 parts 3% $\ce{H2O2}$ (as described in numerous places online). I previously had this stored in a tightly-sealed glass ...
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1answer
532 views

Determining the depression in freezing point experimentally

I was reading about Beckmann's method for determining the depression in freezing point: First, the solvent is placed inside the cooling chamber directly and the approximate freezing point is ...
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1answer
138 views

Creating water from hydrogen and oxygen [closed]

Assuming a scientist has two canisters: One with a liter of pure gas of hydrogen (single atoms gas), and one with half a liter of pure gas of oxygen (single atoms gas). The scientist desires to ...
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2answers
2k views

What is the “blue spirit” (or “red spirit”) in mercury-free thermometers?

I surmise it's some kind of alcohol, but is there a standard chemical used for these? One of them just exploded in my students' lab! It was the kind with blue fluid in it.
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1answer
36 views

Equipment Suggestion Small Burette?

Is anyone familiar with a piece of equipment that can be purchased like a small burette? I need to find a way to dispense a liquid at a constant rate, however, the amount of liquid that I need to ...
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2answers
109 views

Is a beaker/reaction vessel like the one pictured available commercially?

We're doing photocatalysis with the catalyst fixed to a 2" Si wafer, washing an aqueous solution (methylene blue, the concentration varies but in the picture I believe it's 0.1 mMol/l) over the ...
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1answer
335 views

Rule of thumb of how much vacuum does lab glass stand?

Sometimes I have to apply vacuum to all kind of different borosilicate glass equipment like: round bottom flasks liebig condensers fractional distillation apparatus spiral condensers chromatography ...
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1answer
120 views

Dropping Borosilicate glass mug

I recently got a glass tea mug. It's has double wall construction with a vacuum insulation (advertised as such). I noticed on the label, it specifically mentioned it's made of borosilicate glass, and ...
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2answers
348 views

Magnesium oxide lab question [closed]

For my magnesium oxide lab, one of the question asks why I need to include the cover of the crucible when weighing it with the magnesium before the reaction, then again after with magnesium oxide, and ...
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1answer
78 views

What style clamp holder is this?

I cannot for the life of me find this style of clamp holder with beaker base: I can find beaker bases on sites like Fisher Scientific/etc., and flimsy alligator clamp soldering stands on Mouser/etc.,...
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1answer
228 views

Soxhlet extraction condenser - addition of compound to refluxing setup

I've never used Soxhlet apparatus before and I have troubles understanding how to properly perform the following step from my protocol: To a gently refluxing suspension of 1 g Lithium aluminium ...
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1answer
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Viscosity of liquid interrupts accuracy of micropipette?

Does viscosity of liquid interrupt accuracy of micropipette? I would like to dilute 85% $\ce{H3PO4}$ acid to $\pu{1.194 mol/dm3}$ so I had to pipette 366 microliter into 4.634 mL of water. Then, I ...
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1answer
3k views

How is aqua regia stored?

How is aqua regia stored as it dissolves all metals?
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1answer
279 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 ...
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0answers
52 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 ...
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1answer
95 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
55 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 ...
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1answer
150 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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27 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 ...
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342 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 ...
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2answers
1k 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 ...
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1answer
70 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 ...
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1answer
62 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!
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1answer
906 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 ...
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1answer
91 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 ...
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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 ...
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2answers
84 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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96 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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184 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 ...
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1answer
101 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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420 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 ...
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1answer
52 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 ...
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1answer
4k 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 ...
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130 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 ...
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2answers
1k 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 ...