All Questions
7 questions
1
vote
0
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95
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The accurate use of a "Mortar and Pestle" and its grinding patterns
At my internship, I was asked to use a mortar and pestle. I placed a pigment sample in the mortar, and was asked to apply a downward pushing motion in a circular pattern with my pestle. I kept a firm ...
- 1,513
-1
votes
1
answer
98
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Any plastic for long term storage of Puriss. Ethanol?
I'm being offered to share some puriss Ethanol. Can I store it long term in any plastic container without the slightest contamination/reaction from the plastic? I have HDPE, PET, but I could buy ...
- 1,107
0
votes
0
answers
33
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Affordable, non-contaminating flexible tubing for common acids
Which tubing material is affordable, flexible, widely available, and suited for transporting very pure acids ("puriss." products) in their most concentrated form without contaminating them?
...
- 1,107
12
votes
1
answer
2k
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 ...
- 38.5k
0
votes
1
answer
12k
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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
votes
0
answers
193
views
How to minimize surface adsorption by choice of material?
I need to do buoyancy experiments in vapours consisting of organic molecules in air using a microbalance. This involves measuring the change in weight of a sealed glass sphere when exposed to the gas. ...
- 1,836
17
votes
2
answers
2k
views
Safety in handling of concentrated ammonium fluoride
I recently saw a protocol for extracting organic materials that are bound in the silica matrix formed by diatoms. The extraction protocol used 10 molar ammonium fluoride ($\ce{NH4F}$).
I briefly ...
- 22.6k