Question

How many grams of sodium flouride should be added to 100000 litres of drinking water containing 0.6ppm of sodium flouride to provide a recommendation concentration of 1.75ppm?
If you use x kg of NaF, then assuming that the water weighs 1kg/L,
x + .06/10^6 * 10^5 = 1.75/10^6 (x + 10^5)

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