Preparation of 1M KOH solution?
Depends on how accurate you need to be.
Ideally 56.11g of KOH made up to 1L.
Dissolve 56.11g in say 500ml then make up to 1l using water - 1l volumetric is the way to go.
If you need 1000L then I would suggest 56.11kg chucked into 1000L
All the best