Question

A 125 mL aqueous solution contains 1.86 mc032-1.jpg 10–5 g of potassium chloride and has a density of 1.02 g/mL. What is the concentration in ppm?

Answer 1

C

Step-by-step explanation:

Answer 2

mass of the solvent (H2O) in kg

D = m / V

1.02 = m / 125

m = 1.02 x 125

m = 127.5 g of H2O

127.5 / 1000 => 0.1275 kg

mass of solute in mg:

1000 x ( 1.86 x 10⁻⁵ ) = 0.0186 mg

ppm = mass of solute in mg / mass of solvent in kg

ppm = 0.0186 / 0.1275

= 0.1458 ppm

hope this helps!