[pastryhela]

  If mercury (Hg²⁺) is mixed (treated) with three different acids 1) HNO₃ 2) Sulfamic Acid (H₂NSO₃H) and 3) HCl

Which one will it favors first? Which of these acids provide "better/secure" ligand with mercury?
I know all of these acids is to prevent mercury from reduction, but unsure the mechanisms behind it.

would deeply appreciate your *delete me*!!

[Hunter2]

I think it will be Chloride, because soloubilty is not so good. Probably yyou get some precipitation.