I have a few packs of reusable dry ice-gel packs.
They are sent along with the chemicals in a box for keeping the chemicals cool.
Is it possible for me to use that "gel" as dry ice to reach the -78oC (dry ice bath) in one of my experimental step?
If you can cool the packs down cold enough, then I suppose it is theoretically possible, but it seems like an impractical way of making a cryogenic bath.
P/s: Is there any way to determine the -78oC temperature? As I do not have thermometer that can show the temperature this low.
If you're using dry ice, the bath is at -78 °C when the CO2
If you have liquid nitrogen, you can use a frozen EtOAc bath, which is close to -78 °C (EtOAc freezes at -84 °C). We don't routinely have dry ice in our lab, so I use frozen EtOAc instead.