Questions tagged [equipment]
Questions regarding the equipment used in labs (such as flasks, tubes etc.), their operation and maintenance.
178
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Reason for rounded fitting at the top end of Allihn Condenser
I am purchasing an essential oil distillation setup. The Allihn Condenser at the top end, and the attached glassware, are rounded. It is supposedly 24/40. I have never seen this. If one of them broke, ...
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1answer
43 views
Type of equipment to measure exact amounts of liquid
I have to sample $\pu{10mL}$ of liquid hundreds of times a day at work.
We use a $\pu{10mL}$ syringe to do so, but it takes a lot of time as they often allow more than $\pu{10mL}$ to be drawn in (i.e....
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1answer
2k views
What is the scientific term to describe the operation of a bong?
What is the scientific term for the separation of dust particles from air by suction through a specialized flask in a way similar to the operation of a bong?
The thing that led me to this was a ...
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4answers
82 views
Will ground glass joints relieve pressure non-catastrophically?
I need to heat a fluid for seven days at a time. The fluid goes in round bottom flask that is suspended in a water bath. The test fluid will decompose and generate a small amount of gas over time.
...
0
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0answers
36 views
BOD5 respirometric method
I operate in a wastewater treatment plant laboratory and I use respirometric method for BOD5 measurement (hach direct plus). Recently I am obtaining high value for BOD (biological oxygen demand) for ...
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0answers
23 views
Permanent storage container with electrode for electroplating
I'm not a chemist at all but I am looking for a specific type of container which I'm sure must exist but I don't know it's name.
We want to store non-toxic (non-cyanide) gold solution for ...
7
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1answer
286 views
Gold Plating on Glass?
I am considering labware options to handle NaOH solutions at ~150°C. One appealing idea would be to coat my current glassware with gold. I've read different sources mentioning the possibility without ...
2
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0answers
37 views
NaOH vs Polypropylene
This source lists polypropylene as suitable for use with NaOH.
However, this paper seems to demonstrate that NaOH slowly degrades polypropylene (even at fairly moderate temperatures).
Does anyone ...
3
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1answer
129 views
Labware to handle hot aqueous NaOH
This question regarding appropriate handling of hot concentrated aqueous $\ce{NaOH}$ - with particular concern for avoiding dissolution of borosilicate glassware and contamination of the $\ce{NaOH}$ ...
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0answers
56 views
Highly concentrated NaOH solution at high temperature vs borosilicate glassware and cellulose?
I've read here on stack-exchange that NaOH will react with glass through the following reaction:
4 NaOH + SiO2 ⤑ Na4SiO4 + 2 H2O
I would like to briefly heat a highly concentrated NaOH solution to ...
1
vote
1answer
81 views
Order of internal pressure resistance to expect from laboratory glassware?
I have a need to use more pressure differential than can be afforded by vacuum vs atmospheric pressure alone, and so I've come to consider using pressurised laboratory glassware for part of my setup.
...
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1answer
123 views
What kind of metal drums are used to store Hydrochloric Acid?
I would expect Hydrochloric Acid to be stored exclusively in glass or plastic containers, but I was surprised to find Honeywell offers it for sale in 30Kg metal drums (Link).
I think Hydrochloric ...
7
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0answers
35 views
Identifying Name/Purpose of piece of ellipsoid glassware with internal tube?
I recently went to a market in Southern France and found this little piece of equipment for sale along with a whole bunch of other chemistry things. the guy had no idea what it was for or where he'd ...
1
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2answers
143 views
Glass joint stuck in flask
I am doing distillation using system of glassware including a flask and a glass joint. Recently I've faced a problem: the glass joint stuck in the flask. I tried to remove it but it broke and hurted ...
17
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5answers
3k views
Why isn't pressure filtration popular compared to vacuum filtration?
I want to build a DIY vacuum filtration apparatus with a bike pump but it's very difficult to find one the could be easily converted into a vacuum pump. This prompted an idea to simply build a reverse ...
1
vote
1answer
41 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
52 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 ...
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vote
0answers
38 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.
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2answers
686 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
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0answers
67 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
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0answers
35 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) ...
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0answers
55 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...
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1answer
84 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 ...
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0answers
22 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
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1answer
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1answer
112 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
35 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
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3answers
156 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
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2answers
1k 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
862 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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0answers
103 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
79 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
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1answer
264 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
77 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
89 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
205 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
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1answer
56 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
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1answer
66 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
1k 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
178 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
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2answers
3k 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
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1answer
40 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
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2answers
158 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
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1answer
820 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
286 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
453 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
84 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
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1answer
421 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
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1answer
42 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 ...
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1answer
4k views
