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Romix
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[*] posted on 19-2-2016 at 19:08
Solvent for glue


Please recomend solvent, that will easily dissolve glue.

I tried 2-propanol, cold and boiling hot. Not dissolving it.
Glue that hold rubber to pcb.
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[*] posted on 19-2-2016 at 19:52


The pool is an inflatable with no pump or filter. I give it a few pool chemicals to make the water last a bit longer for the kids.

Yes I checked it with both pH paper and phenol red. The meter is reading high.

The meter has never gotten dry. It is kept in a buffered solution which, as far as I can tell is unchanged - close to neutral.




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[*] posted on 19-2-2016 at 20:20


What kind of glue? Maybe try acetone.



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[*] posted on 19-2-2016 at 20:39


My PH meter recommends using only a storage solution and it came with a small bottle, after the small bottle of solution ran out I have been storing it in tap water without any issues, storing them in distilled water will ruin them, I'm not sure about 6.86 buffer though

[Edited on 20-2-2016 by NedsHead]
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[*] posted on 19-2-2016 at 20:56


Quote: Originally posted by symboom  
ive mixed the two in a process to extract potassium chlorate from matches and part of it is to add ammonium hydroxide to the mix. Not sure if it is a reaction or so it seems is it reacting if so what is formed or

[Edited on 13-2-2016 by symboom]


I think a soluble hypophosphite is formed
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[*] posted on 20-2-2016 at 10:30


Quote: Originally posted by Cheddite Cheese  
You could use it with HCl for reductions (for example, nitrotoluene to toluidine).


Can I do that with gray tin, too? So the covalent allotrope. Because that is what I have.
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[*] posted on 20-2-2016 at 10:34


Quote: Originally posted by Kagutsuchi  
Quote: Originally posted by Cheddite Cheese  
You could use it with HCl for reductions (for example, nitrotoluene to toluidine).


Can I do that with gray tin, too? So the covalent allotrope. Because that is what I have.


Should work with either.

That reminds me- I was going to put a bit of tin in the freezer, to see if it changed.




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[*] posted on 21-2-2016 at 17:33


WTF is a zeotrope?



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[*] posted on 21-2-2016 at 17:35


Quote: Originally posted by arkoma  
WTF is a zeotrope?
azeotrope?
https://en.wikipedia.org/wiki/Azeotrope




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[*] posted on 21-2-2016 at 17:42


nope ZEOTROPE. I'm wondering if I can fract distill the water off of 5% AcOH. I've read the wiki on zeotropes but it is ambiguous to my somewhat fractured brain.



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[*] posted on 21-2-2016 at 17:59


closest thing I could find was Zeotropic Mixture? https://en.wikipedia.org/wiki/Zeotropic_mixture
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[*] posted on 21-2-2016 at 21:45


Yes, acetic acid and water are a zeotropic mixture. That is, they do not form an azeotrope and can be separated by distillation. Note that this fractionation is considered exceptionally difficult due to the close boiling points. A packed column with a significant number of theoretical plates and a high reflux ratio will be needed.

Using a smaller column like a vigreux or even a slow simple distillation, you will be able to concentrate the acetic acid but it will not be anhydrous or near it, especially for the latter option.
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[*] posted on 22-2-2016 at 11:44


In words derived from Greek, a- or an- means "not" or "without". So atheist is the opposite of theist, anisotropic is the opposite of isotropic, agnostic is the opposite of gnostic, and an anaphrodisiac is the opposite of an aphrodisiac.



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[*] posted on 23-2-2016 at 06:59


Thanx UC. Have a vigreux and since I need to keep my mind off the possible tornadoes later today may give it a whirl.



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[*] posted on 23-2-2016 at 09:25


Would it be hasty to describe pH (in terms of acidity or how basic something is) as an electrical imbalance?

Or is that rather incorrect?

A tad abstract, but I always end up just seeing reactions as a transfer of energy (electrical or otherwise, and usually electrical) from one atom to another in the form of electrons, and most definitions seem to try to just describe it as a change in hydrogen protons? Is there a practical difference between such an exchange and an electrical charge, in the technical sense of things?




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[*] posted on 23-2-2016 at 21:16


Quote: Originally posted by arkoma  
tornadoes later today may give it a whirl.
Unintended pun?
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[*] posted on 24-2-2016 at 03:52


Anyone ever use one of these geiger counters that plug into a phone?



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[*] posted on 24-2-2016 at 06:31


A colleage here at work who is into radioactivity who I just asked,
recognised it immediately and said that these are just large area photodiodes with a low gate leakage fet amplifier.
Sounds true as only gamma- and x-rays detected.
Given that, it will probably work as advertised.
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[*] posted on 27-2-2016 at 09:56


Quote: Originally posted by Sulaiman  
A colleage here at work who is into radioactivity who I just asked,
recognised it immediately and said that these are just large area photodiodes with a low gate leakage fet amplifier.
Sounds true as only gamma- and x-rays detected.
Given that, it will probably work as advertised.

Cool. That means they'd be mighty cheap to make. I'll have to look to see if there are any schemas available.




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[*] posted on 27-2-2016 at 10:46
Grignard question


What would the product of a Grignard Reaction using isopropyl magnesium bromide and acetone be?
There's not much information about the compound available.


[Edited on 27-2-2016 by SmellNoEvil]
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[*] posted on 27-2-2016 at 11:03


Quote: Originally posted by SmellNoEvil  
What would the product of a Grignard Reaction using isopropyl magnesium bromide and acetone be?

[Edited on 27-2-2016 by SmellNoEvil]

I hope you don't mind my not using the IUPAC name. In SMILES code:
CC(C)MgBr + CC(=O)C --> CC(C)C(C)(C)OMgBr

When neutralized to the alcohol, you get:
CC(C)C(C)(C)O, or 1,1,2-trimethylpropanol. I think. My prioritizing of groups in IUPAC is bad...




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[*] posted on 27-2-2016 at 11:09


Quote: Originally posted by The Volatile Chemist  
Quote: Originally posted by SmellNoEvil  
What would the product of a Grignard Reaction using isopropyl magnesium bromide and acetone be?

[Edited on 27-2-2016 by SmellNoEvil]

I hope you don't mind my not using the IUPAC name. In SMILES code:
CC(C)MgBr + CC(=O)C --> CC(C)C(C)(C)OMgBr

When neutralized to the alcohol, you get:
CC(C)C(C)(C)O, or 1,1,2-trimethylpropanol. I think. My prioritizing of groups in IUPAC is bad...

2,3-dimethyl-2-butanol




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smile.gif posted on 27-2-2016 at 18:37
Could this be useful ?


In areas with too much sulfur dioxide, could we[in a industrial process] convert it into sulfur trioxide, make it react with water to create sulfuric acid and then make it react with sucrose to make carbon which could be used for industrial processes?
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[*] posted on 29-2-2016 at 16:12
H2O2


I'm planning on concentrating some 12% H2O2 to 30% by removing water under vacuum at ~30c, is this as safe as I think it is?
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[*] posted on 29-2-2016 at 16:33


So i guess if you guys subscribe to some major scientific magazines like, scientific american, or new scientist for example, you might have seen one of the posts like working memory correlates to ability to ignore.

Now sorry if this question sound ignorant, I havent studied much neuroscience, but if I practice my ability to ignore things, such as ignoring a radio while doing something else, would that improve my memory in any way?
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