preparation of methanoli HCl

very expensive if you buy it from aldrich.
easy to make.
you need HCl gas cylinder or you can prepare it from con. sulfuric acid and NaCl ( add sulfuric acid into NaCl and stirring).

then you bubble HCl gas to MeOH. heat will be generated so an ice bath can be used.
by weighing the MeOH before and after, the concentration can be easily calculated.
In my case, I can easily reach 6N .