silver chloride
AgNO3(aq) + KCl(aq) --> AgCl(s) + KNO3(aq)
This precipitate is silver bromide - AgBr.
The precipitate is nickel(II) carbonate.
The chemical reaction is:
CaCl2 + K2CO3 = CaCO3(s) + 2 KCl
The precipitate is calcium carbonate.
Ni(CH3COO)2
Formula: Ni(NO3)2
Formula: Ni(CN)2
Nickel(II) is the plus two (+2) oxidation state of nickel (Ni), and we write it Ni(II) or Ni++ when we set it down.