How many milligrams of sodium fluoride are needed to prepare 100 ml of a sodium fluoride stock solution such that a solution containing 2 ppm?

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09-01-2018
Chemistry

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How many milligrams of sodium fluoride are needed to prepare 100 ml of a sodium fluoride stock solution such that a solution containing 2 ppm?

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Yna9141 Yna9141 · Answer 1 · 2018-01-22T22:35:59+01:00

The unit ppm (parts per million) should be numerically equal to the unit of mg/L (milligram per liter). First, we determine the volume of the stock solution in L.

V = (100 mL)(1 L/1000 mL)
V = 0.1 L

Then, the equation that would allow us to determine the value of mass is,

C = m/V

where C is concentration, m is mass, and V is the volume.

Substituting the known values,
2 = m/ 0.1

The value of m from the equation is 0.2.

Answer: 0.2 mg