Answer :
To determine the chloride ion concentration in the solution, we need to use the stoichiometry of the dissolution process of NaCl. When sodium chloride dissolves in water, it dissociates into its constituent ions: sodium ions (Na+) and chloride ions (Cl-).
The chemical equation for the dissolution of NaCl in water can be written as:
NaCl (solid) → Na+ (aqueous) + Cl- (aqueous)
From this equation, we see that one mole of NaCl dissociates to form one mole of Na+ and one mole of Cl-. This means that the stoichiometry of the dissolution is 1:1 for sodium ions to chloride ions.
Given that the solution has a sodium ion concentration of 150 ppm, and knowing that the stoichiometry is 1:1, it follows that the concentration of chloride ions in the solution will be the same as that of the sodium ions.
Therefore, the chloride ion concentration in the solution is also 150 ppm.
The correct answer to the question is:
150. ppm
