please help ASAP water has fluoride ion added in many parts of U.S.A water sample contains...

Question

Question

please help ASAP

water has fluoride ion added in many parts of U.S.A water sample contains 0.70 ppm F-

a. what mass of F- is contained in one liter of this water? density is 1.00 g/mL

b. what mass of CaF2 will result if all the water is evaporated from a 1.0 L sample of 0.70 ppm fluoridated water?

science chemistry

Answer 1

Answer #1

a) The mass of F- is calculated:

mg F = 0.70 mg / L * 1 L = 0.70 mg

b) The mass of CaF2 is calculated:

mg CaF2 = 0.70 mg / L * 1 L * (70 mg CaF2 / 2 * 20 mg F-) = 1.225 mg

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Answer 2

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