I have to use dilute salt solutions incredibly frequently, and it takes valuable time to make them from pure reagents every time I need them.
Are concentrated salt solutions fairly stable over time? Does anyone know of any papers describing their ability to maintain static concentrations for long periods?
To qualify, I am curious about a wide range of salts. NaCl, ammonium chloride, magnesium sulfate, calcium chloride, potassium phosphate etc...
I am also not especially concerned about analytical precision for my use, but understanding how this could be affected might be useful to others.