List several anions, by formula, that contribute to the salinity of a water sample.

Question

Is this the answer? :

chloride
sulfate
sodium , Na
bicarbonate
carbonate
bromide
fluoride

What does it mean by formula?

thanks so much !

Answer 1

salinity is normally how much NaCl
Na+ is a cation
Cl- is an anion

Answer 2

chloride Cl^-
sulfate SO4^2-
sodium , Na Na^+
bicarbonate HCO3^-
carbonate etc
bromide etc
fluoride etc