Fluoride ion is poisonous in relatively low amounts: 0.2 g of f− per 70 kg of body weight can cause death. nevertheless, in order to prevent tooth decay, f− ions are added to drinking water at a concentration of 1 mg of f− ion per l of water.

how many liters of fluoridated drinking water would a 70−kg person have to consume in one day to reach this toxic level?
answer in scientific notation

liters of fluoridated drinking water would a 70−kg person have to consume in one day to reach this toxic level

Explanation:

1g =1000mg

So,

is toxic for 70kg person

Fluoride present in drinking water is 1mg per L.

So 200mg is present in 200L

200L of fluoridated drinking water is toxic to a 70kg person which  can cause death.

Using dimensional analysis,

drinking water (Answer)

mechanics (greek   is that area of science concerned with the behaviour of physical bodies when subjected to forces or displacements, and the subsequent effects of the bodies on their environment. the scientific discipline has its origins in ancient greece with the writings of aristotle and archimedes[1][2][3] (see history of classical mechanics and timeline of classical mechanics). during the early modern period, scientists such as galileo, kepler, and newton laid the foundation for what is now known as classical mechanics. it is a branch of classical physics that deals with particles that are either at rest or are moving with velocities significantly less than the speed of light. it can also be defined as a branch of science which deals with the motion of and forces on objects. the field is yet less widely understood in terms of quantum theory.

explanation: