diethyl ether is polar?
printers demon, sorry, i edited it. Non polar obviously.
The HCL I have has the following description - "Hydrochloric Acid 0.1M Volumetric solution". Is this ok ? What happens if it's more than 38% pure ?
0.1M means 0.1 molarity? That means your hcl acid solution has 0.1 moles of hcl acid per litter of water, i.e it has 3.646gr of hcl acid per 1000gr of water. For reference the 38% solution has ~452gr of hcl acid per liter of water (that means it would state 12.39M)
Your hcl acid solution is way to dilute. Doing it stoichiometric would mean that you would have to add 3.3ml of your solution for every gr of cocaine base. That would be imho too much water... You need a more concentrated solution of hcl acid for sure.
You cant have more that 38% w/w hcl acid solution in water. Hydrochloric acid is a gas, you can have it in gas form in higher concentrations than 38%.
Does adding magnesium sulphate to all / most of the chemicals in this process make them anhydrous ?
lol no, well you cant add magn sulphate to water solutions obviously

Dont give it a go untill you have the proper chemichals.
You need these:
10% ammonia (or higher concentration and dillute it yourself)
distilled water
at least 31% (w/w) hcl acid
anhydrous acetone (or regular acetone and magn sulfate)
anhydrous methanol