A water sample has a mass of 25.0 g. It contains 1.56 * 10-5 g NaCl. What is the best set up to find ppm?

ppm = mol solute/mass solution * 106

ppm = mass solute/mass solution * 106

ppm = mol solute/mass solvent

Second option is the right one

Explanation:

The ppm concentration indicates a relation between the mass of solute in mass of solution, where the units have a quotient of 1*10⁻⁶.

You can think the units as mg/kg or μg / g

We assume the solvent's mass, as the solution's mass

ppm = mass solute/mass solution * 10⁶

ppm = 1.56*10⁻⁵ g NaCl. 10⁶ / 25 g

ppm = 0.62

0.624 for edge