2. To prepare:
a) 0.2 M AgNO3, 25 mL. (Store in a brown bottle after preparing. Do not get AgNO3 on your hands. If you do, wash immediately with a sodium thiosulfate solution.)
b) 0.12 M HNO3, 25 mL. (Prepared by diluting 6 M HNO3)
c) 0.1% w/v salt sample solution, 100 mL.