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(a) Find the amount (in grams) of sodium fluorosilicate (aka, silicofluoride) powder, Na2SiF6, needed to make...

(a) Find the amount (in grams) of sodium fluorosilicate (aka, silicofluoride) powder, Na2SiF6, needed to make a solution that contains 0.7 mg/L of fluoride (F). (b) The City of Fargo supplies 12 million gallons of water every day to the public. What is the total amount of sodium fluorosilicate needed per year by the City of Fargo to maintain the USEPA recommended 0.7 mg F/L in its water supply? (c) What will be total cost of sodium fluorosilicate for the city per year if the price of sodium fluorosilicate (delivered) is $525 per metric ton? (d) The city water serves 172,359 people. How many dollars will be charged extra per household (4 people make a household) per year by the city for this fluoridation (fluoride addition) if there is a 20% additional cost for labor and other cost items? (5x4 = 20)

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