Answer to Question #140879 in General Chemistry for joshua

Question

. If 1000 g of water from Luboc River contains 0.0075 g of Ca2+ ion, what is the concentration in ppm by mass of Ca2+ present in Luboc River

Answer 1

Solution:

Parts Per Million (ppm) is a measurement of the concentration of dilute solution.

In weight/weight (w/w) terms 1 ppm = 1 mg solute / 1 kg solution.

Convert the mass of the solute in grams to a mass in milligrams:

0.0075 gram of Ca²⁺ × 1000 mg = 7.5 mg of Ca²⁺

Convert the mass of the water solution in grams to a mass in kilograms:

1000 g of solution / 1000 = 1 kg of solution

And then,

ppm of Ca²⁺  = 7.5mg / 1kg = 7.5 ppm

Answer: Concentration of Ca²⁺ in the water is 7.5 ppm.