Given
(Credits to @G.Patton)
6.2g methylamine in 35mL water (prepared by adding a solution of 7.9g (198mmol) sodium hydroxide in 20mL cold water to a cooled solution of 13.5g methylamine HCl in 15mL water). This results in an 15% methylamine solution.
We want to scale this to yield a 21%...
