Question

which are the two most common ions in seawater are? bicarbonate (hco3-) & ammonium (nh4+) potassium (k+) & sulfate (so42-) sodium (na+) & sulfate (so42-) chloride (cl-) & sodium (na+)

Explanation:

Seawater has a high concentration of dissolved salts. The most abundant ions in seawater are chloride (Cl⁻) and sodium (Na⁺), as they are major components of sodium chloride (table salt) which is highly concentrated in seawater. The other options include ions that are not as abundant as Cl⁻ and Na⁺ in seawater.

Answer:

D. chloride (Cl⁻) & sodium (Na⁺)