Why are alkali metals difficult to characterize in a qualitative analysis scheme?

Answer 1

because they are soluble in almost anything and they don't form polar precipitate

Answer 2

Alkali metals such as sodium and potassium are difficult to detect in qualitative analysis schemes because they are highly reactive and can easily form compounds with other elements in the solution, making their distinctive properties harder to identify. Their reactivity can also cause interference with other ions in the solution, leading to false positive or negative results in the analysis.