Oxalic acid treatment

[madasafish]

Oxalic question.i know it sublimates, and from my high school chemistry remember that as going solid to gaseous state and skipping the liquid. The last vaping I did clearly went into a liquid stage before boiling away and then getting white vapour. Would this be the generic oxalic having absorbed atmospheric moisture? And is there any problem still using it ? Another lesson learnt to store it better..

If there is moisture in the OA that will be driven out with heat.
OA vaporises at over 100C so any water will be steam before sublimation.
I an still using sealed tub of OA purchased in 2017: still works OK..

 

[drex]

The full name for OA is oxalic acid dihydrate. So, each OA molecule has two water molecules attached. It is this you see boiling off. Perfectly normal

 

[JimBee463]

or just buy some generic Oxalic Acid (that doesn't have a manufactured shelf life)

Trouble is, as a newbie I would have no idea how much to use for the trickle method.

 

[jenkinsbrynmair]

Trouble is, as a newbie I would have no idea how much to use for the trickle method.

Disolve 1kg sugar in 1 litre of water. This produces 1.67L of 1:1 (100%)syrup. Add 75grm of Oxalic Acid. This gives a 3.2% Oxalic Acid (weight/volume) solution which is more commonly expressed as 4.5%

just pro rata the quantities to suit your needs