Sodium fluoride is added to drinking water. A 25-L sample of city water contains 0.018 g NaF. Express this concentration in molarity.

Question

Quizplus · Accepted Answer

To find molarity, divide the moles of solute by the volume of solution in liters. First, convert 0.018 g NaF to moles using its molar mass (NaF = 41.99 g/mol). Moles of NaF = 0.018 g / 41.99 g/mol = 0.000428 moles. Then, divide by the volume in liters: 0.000428 moles / 25 L = 0.00001712 M, which rounds to 0.00072 M.

Sodium Fluoride Is Added to Drinking Water