Yttrium2
Perpetual Question Machine
Posts: 1104
Registered: 7-2-2015
Member Is Offline
|
|
Drying Crystals without oven
Can this always be done?
Is there anytime an oven needs to be utilized to dry hygroscopic crystalline salts?
|
|
|
Bedlasky
International Hazard
Posts: 1239
Registered: 15-4-2019
Location: Period 5, group 6
Member Is Offline
Mood: Volatile
|
|
Have you ever heard about desiccator and vacuum desiccator?
|
|
|
Lionel Spanner
Hazard to Others
Posts: 168
Registered: 14-12-2021
Location: near Barnsley, UK
Member Is Online
|
|
Another method is azeotropic distillation of the water; useful for substances like oxalic acid, which sublimes at around 155 °C and has a significant
vapour pressure above 100 °C.
If the distillation is done under reduced pressure, the temperature can be reduced further.
|
|
|
Mateo_swe
National Hazard
Posts: 541
Registered: 24-8-2019
Location: Within EU
Member Is Offline
|
|
You need a desiccator (or a DIY replacement) and a drying agent like anhydrous Epsom salt or NaSO4.
Heat and vacuum is optional in most cases but it dries faster using it.
|
|
|
j_sum1
Administrator
Posts: 6320
Registered: 4-10-2014
Location: At home
Member Is Offline
Mood: Most of the ducks are in a row
|
|
For low tech, make a desiccator bag.
Use a large zip-lock bag or an air-tight plastic container. Pop a desiccator in there as well as your material to be dried – both on a shallow
dish. Leave for a long time. Come back later and your material should be a lot drier.
Suitable desiccators are concentrated H2SO4 or CaCl2 (pool grade is satisfactory). NaOH or KOH probably also work, although I admit that I have never
used them. I have many other uses for these bases and don't use them for trivial drying tasks.
Alternatively, buy a cheap toaster oven. Mine gets quite regular use for drying glassware and small batches of some compounds.
|
|
|
Yttrium2
Perpetual Question Machine
Posts: 1104
Registered: 7-2-2015
Member Is Offline
|
|
To be more clean, elaborating, direct, succinct, and frank,
No utility hook ups may be used in the H3PO3 isolation challenge 
That’s why there is no oven***
In addition to mag stirring
Vacuum.
Can it be done?
|
|
|
Yttrium2
Perpetual Question Machine
Posts: 1104
Registered: 7-2-2015
Member Is Offline
|
|
Additionally H3PO3 reacts with lots of drying agents.
Does that mean desiccant too? Or is more hygroscopic, so it won’t be dried.
Why?
[Edited on 10/7/2022 by Yttrium2]
|
|
|
Yttrium2
Perpetual Question Machine
Posts: 1104
Registered: 7-2-2015
Member Is Offline
|
|
Quote: Originally posted by j_sum1  | For low tech, make a desiccator bag.
Use a large zip-lock bag or an air-tight plastic container. Pop a desiccator in there as well as your material to be dried – both on a shallow
dish. Leave for a long time. Come back later and your material should be a lot drier.
Suitable desiccators are concentrated H2SO4 or CaCl2 (pool grade is satisfactory). NaOH or KOH probably also work, although I admit that I have never
used them. I have many other uses for these bases and don't use them for trivial drying tasks.
Alternatively, buy a cheap toaster oven. Mine gets quite regular use for drying glassware and small batches of some compounds.
|
H2S04 reacts with H3PO3, is it really suitable for drying H3PO3 if it does not make contact, or would the fumes interact?
|
|
|
![[*]](images/xpblue/default_icon.gif){kind=icon}
