Stack Exchange Network

Stack Exchange network consists of 175 Q&A communities including Stack Overflow, the largest, most trusted online community for developers to learn, share their knowledge, and build their careers.

Visit Stack Exchange

Questions tagged [equipment]

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

1
vote
1answer
24 views

Can I safely use a separatory funnel to extract the precipitate from a solution?

Can a separatory funnel be used to collect a precipitate, or would that risk clogging the stopcock on it? I'd like to recoup the precipitate for filtering without passing the entire solution through ...
0
votes
1answer
21 views

What are the components of a labware setup for short-path distillation?

I've recently become interested in short-path distillation and have found that most kits are in the thousands of dollars. So I thought that I would compile the labware myself. I understand the theory ...
1
vote
0answers
23 views

Can we use potassium iodide as pH meter electrode storage solution.? If not then why?

If KCl is not available can KI be used to store pH probe meters? Both are potassium salts.
8
votes
2answers
656 views

400–430 degrees Celsius heated bath

I want to perform a reaction which needs the temperature to be maintained between 400–430 °C. Since it's the only practical solution, I opted for a heated bath. I'm looking for a hydrocarbon fraction/...
4
votes
0answers
57 views

An unknown glassware piece from our cupboard

We have multiple of these. It is a small glass funnel with splits into 3 spouts from it. Now, we are thinking it might be similar to a cow receiver, however, I have never seen one this small or ...
4
votes
0answers
30 views

Unknown possibly handmade glassware- description in information below

Okay, Another random item from the cupboard (unknown users or discipline of life sciences unknown) could be anything up to 40 years old.... This appears to be a 2 neck quickfit adapter (B19 and B14) ...
0
votes
0answers
49 views

Unknown glassware please help, vshaped with a small bulb on one side, hollow but narrow to both sides!

Looking to try an identify some glassware we have found in a cupboard. This is just the start of it... 1 item here, v-shaped, small bulb but hollow, narrow entrance and exit...
1
vote
1answer
57 views

Removing PTFE marks on glass bottles after using magnetic stir bars

I am using magnetic stir bars to agitate solutions for 4 weeks at a time. I have noticed at the bottom of the glass bottles that white marks have accumulated where the stir bar spins. Even with ...
1
vote
0answers
15 views

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 ...
17
votes
1answer
2k views

What's this glassware?

Can anybody tell me what this glassware with a stem, bulb and long tube is?
2
votes
1answer
83 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 ...
0
votes
1answer
31 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 ...
2
votes
3answers
89 views

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 ...
4
votes
2answers
651 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 (...
11
votes
1answer
851 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 ...
1
vote
0answers
69 views

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 ...
3
votes
0answers
41 views

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 ...
0
votes
1answer
107 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 ...
0
votes
1answer
63 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)?...
1
vote
1answer
71 views

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) ...
4
votes
1answer
76 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 ...
2
votes
1answer
51 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 ...
0
votes
1answer
59 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 ...
-1
votes
1answer
642 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 ...
0
votes
1answer
139 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 ...
18
votes
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.
0
votes
1answer
37 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 ...
5
votes
2answers
127 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 ...
1
vote
1answer
407 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 ...
1
vote
1answer
129 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 ...
-2
votes
2answers
356 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 ...
3
votes
1answer
80 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.,...
1
vote
1answer
257 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 ...
1
vote
1answer
40 views

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 ...
8
votes
1answer
4k views

How is aqua regia stored?

How is aqua regia stored as it dissolves all metals?
6
votes
1answer
282 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
votes
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 ...
2
votes
1answer
99 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 ...
1
vote
2answers
58 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
votes
1answer
157 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?
1
vote
0answers
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 ...
6
votes
0answers
384 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
votes
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 ...
3
votes
1answer
75 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
votes
1answer
66 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
votes
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
vote
1answer
97 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
votes
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
votes
2answers
89 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 ...
13
votes
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: