Question

Can you drink heavy water $D_2O$?

Answer 1

Hint: The human physique naturally consists of deuterium equal to about 5 grams of heavy water, which is harmless. When a massive fraction of water > 50% in greater organisms is changed through heavy water, the end result is mobile dysfunction and death.

Complete answer:
Made by way of swapping water's hydrogen atoms with their heavier relative, deuterium, heavy water appears and tastes like ordinary water and in small doses (no greater than five tablespoons for humans) is protected to drink. As the molecular mass of heavy water is greater than water so its physiological motion is unique from everyday water and due to the fact of that cause it can no longer be used as consuming water.
A molecule of heavy water has two deuterium atoms in location of the two protium atoms of regular "light" water. Actually, the time period heavy water as described by means of the IUPAC Gold Book can additionally refer to water in which a greater than traditional percentage of hydrogen atoms are deuterium alternatively than protium.
 For instance, the heavy water used in CANDU reactors is a particularly enriched water combination that consists of normally deuterium oxide D₂O, however additionally some hydrogen-deuterium oxide (HDO) and a smaller quantity of normal hydrogen oxide H₂O.
It is 99.75% enriched through hydrogen atom-fraction meaning that 99.75% of the hydrogen atoms are of the heavy type, however, heavy water in the Gold Book experience no longer be so tremendously enriched. Where this article makes use of heavy water, though, is potential D₂O.
The weight of a heavy water molecule, however, is no longer appreciably exclusive from that of an ordinary water molecule, due to the fact about 89% of the molecular weight of water comes from the single oxygen atom as an alternative than the two hydrogen atoms.

Note:
Heavy water has the equal chemical components as any different water with the exception that one or each of the hydrogen atoms are the deuterium isotope of hydrogen instead of the everyday protium isotope (which is why heavy water is additionally regarded as deuterated water or D₂O).