The maximum acceptable concentration of fluoride in tap water is 1.5mg/l. express this concentration in ppm. then figure what volume of tap water contains 1.0 g of fluroide

Given that the maximum acceptable concentration of fluoride in tap water = 1.5 mg/L.

1 mg/L is equivalent to 1 parts per million(ppm).

Converting 1.5 mg/L to ppm:

So the maximum acceptable concentration of fluoride in tap water in ppm is 1.5 ppm.

Finding out the volume of tap water that would contain 1.0 g fluoride:

Converting 1.0 g fluoride to mg:

Taking the concentration of fluoride in tap water to be 1.5 mg/L,

Volume of tap water that contains 1000 mg fluoride

                              =

Rounding the volume to three significant figures, 667 mL of tap water.

thats how its supposed to be