Question

a 25.7027g sample of well water was placed in an aluminum dish as evaporated to dryness. The residue weighed 0.0035g, what is the concentration of total solids in the well water in ppm?

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Answer #1

mass of solute (residue) = 0.0035 g

and

mass of solution = 25.7027 g

thus

concentration of total solids in the well water = mass of solute * 1000000 / mass of solution

or

= 0.0035 * 1000000 / 25.7027

or

= 136.2 ppm (answer)

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