Chapter U4.15, Problem 8E

Interpretation Introduction

Interpretation:

Whether it is safe to drink a glass of water with concentration of fluorine 0.00010 M must be explained.

Concept introduction:

Drinking water shouldn’t have more fluorine than the upper limit.

Answer to Problem 8E

It is safe to drink a glass of water in which the concentration of fluorine is 0.00010 M.

Explanation of Solution

Concentration of fluorine is 0.00010 M. It means there is 0.00010 mole fluorine in 1L.

It must be converted to g/L to compare the amount of fluorine with upper limit of fluorine as set by the Environmental Protection agency.

Molecular weight of fluorine is 19.

Thus amount of fluorine in 1L will be:

  $m=0.00010\times 19g=0.0019g$

It is less than the upper limit of fluorine which is 0.0040 g/L.

Conclusion

Thus, it safe to drink a glass of water in which the concentration of fluorine is 0.00010 M.