Question

How is chemically pure water obtained in a laboratory?

Answer 1

Well you can take any water and make it pure by boiling(not 100%pure but around 90–99%)

Or if you know the impurities apply the suitable method permutit process by which even the hardness of the water will be gone and you will obtain absolutely pure water that though is undrinkable, it has to has some degree of hardness to drink it.
HOPE THIS WILL HELP U

Answer 2

Answer:

Water can be boiled and the vapour can be condensed in a condenser. It is a chemical process which uses specially manufactured ion-exchange resin. These resins exchange hydrogen and hydroxide ions for dissolved minerals. Then they recombine to form water.