Express the concentration of a 0.0790 M aqueous solution of fluoride, F–, in mass percentage and in parts per million. Assume the density of the solution is 1.00 g/mL.
How do you actually solve it?
How do you actually solve it?
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ppm = mg/kg.
0.0790 M = 0.0790 mol/L = 0.0790 mol/kg
(since 1 mL = 1 g so 1L = 1 kg).
mass = moles x atomic mass
= 0.0790 mol x 18.998 g/mol = 1.5 g = 1500 mg.
1500 mg/kg = 1500 ppm F-.= 0.15%.(m/m).
0.0790 M = 0.0790 mol/L = 0.0790 mol/kg
(since 1 mL = 1 g so 1L = 1 kg).
mass = moles x atomic mass
= 0.0790 mol x 18.998 g/mol = 1.5 g = 1500 mg.
1500 mg/kg = 1500 ppm F-.= 0.15%.(m/m).