Fluoride, in the form of sodium silicofluoride (Na2SiF6), is commonly added to m

Question

Fluoride, in the form of sodium silicofluoride (Na2SiF6), is commonly added to municipal drinking water to prevent tooth decay. It is generally added at a level of 1.0 mg/L, but its maximum concentration level (MCL) cannot exceed 4.0 mg/L. You have been assigned to prepare a liter of a standard solution that contains 1.000 mg/L fluoride. Explain, in detail, how you would prepare this solution so a labmate could prepare it from your instructions. Your answer must include a brief explanation of the calculations you did to get the mass of substance that will be used to prepare the solution.

Explanation / Answer

Since Fluoride is obtained from Na2SiF6 So to prepare one litre of 1gm/L strength mass of fluoride = 1gm/L * 1L = 1gm Now, 1 mol of Na2SiF6 gives 6 moles of F m1/220 = 6* 1/19 m1 = 6 *220/19 = 69.47 mg of Na2SiF6 has to be taken to produce 1mg/L solution of fluoride

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