All Questions
15
questions
2
votes
1
answer
77
views
Is it safe to use borosilicate lab glass as an autoclave?
I'm attempting to do a one-pot synthesis that requires autoclaving the chemical mixture. I thought this process would be greatly simplified by using the lab glass itself as the autoclave in situ ...
- 149
5
votes
2
answers
234
views
Why don't oils use plastic droppers?
As shown in the picture, most cosmetic oils and serums make use of glass droppers. However in the chemistry lab, scientists often also use reusable plastic droppers as well. My question was that, ...
- 1,528
4
votes
1
answer
2k
views
How should you report measurements and uncertainty for a measuring cylinder with 0.5 mL graduations?
I understand that a common convention is to report the uncertainty of an analogue instrument as plus or minus half of the smallest scale division.
By this logic, a measuring cylinder with $\pu{0.5 mL}$...
- 135
2
votes
0
answers
94
views
Appropriate ways to remove aluminum from the surface of glass?
I'm looking for a way to treat the surface of borosilicate glassware such that it won't contaminate solutions of puriss reagents in conditions that pure $\ce{SiO2}$ wouldn't, yet keep the bulk ...
- 1,097
7
votes
2
answers
10k
views
How to identify a blow-out pipette?
Is my pipette a blow-out pipette?
I suspect that it is a blow-out pipette, though the double lines aren't rings. My guess is it is a TC blow-out pipette. It's a big 50 mL pipette, longer than my arm.
...
- 197
1
vote
1
answer
2k
views
when using glass to glass stoppers, is it best to have them dry or use lubricant?
I have some glass flasks that have glass stoppers. It’s basically the typical glass stopper with the frosted tip which fits into a glass opening. Basically think of a typical glass volumetric flask. i ...
- 21
1
vote
0
answers
74
views
Is the width of a Soxhlet Condenser Inherent to its Function?
Soxhlet extractors are often coupled to a specifically designed condenser with a very large lower joint.
Is this inherent to it's function as a condenser in the apparatus or only because the Soxhlet ...
- 1,097
9
votes
1
answer
2k
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 ...
- 1,097
0
votes
0
answers
796
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 ...
- 1,097
4
votes
2
answers
4k
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 (...
- 263
3
votes
1
answer
2k
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 ...
- 159
1
vote
0
answers
329
views
Why molten lithium burns through the glass but sodium not?
It's well-known in laboratory practice that one shouldn't melt lithium in a glass equipment and there isn't such rule about other alkali metals.
You may damage the glass with sodium but lithium will ...
- 11
3
votes
1
answer
991
views
Devitrification vs glass transition temperature
This graph comes from a so-called "differential thermal analysis". It is studying the effects of temperature on glass.
I don't understand what the difference between "glass transition" and "...
- 813
9
votes
2
answers
6k
views
How to quickly cool a test tube without cracking it?
Is there a way to safely cool a heated test tube quickly without cracking it due to sudden thermal stress in the glass? One thing that I tried was blowing on it, cooling it in slightly lukewarm water ...
- 400
4
votes
2
answers
404
views
Will borosilicate glass absorb 808nm laser light?
Will borosilicate glass absorb 808nm laser light? If it instead refracts, then what is the refractive index? Also, will borosilicate reflect lower frequencies of light like those used in non contact ...
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