Which of these saturated solutions has the lowest concentration of dissolved ions?

A) NaCl [aq]

B) MgCl2 [aq]

C) NiCl2 [aq]

D) AgCl2 [aq]

D) AgCl

Step-by-step explanation:

The soubility rules state that salts containing Cl⁻ are generally soluble. An important exception is Ag⁺.

Thus, AgCl is insoluble and it has the lowest concentration of dissolved ions.

A), B), and C) are wrong, because all the compounds are soluble.