How can you make sure that all of the water of hydration is removed?

Solution:

For that we have weigh the compound and heat it.  

If the weight before the heating and after heating is in equal then we can say the water in hydrated compound has been still there.  

But if the weight is change or less, then we must say that the water is lost.

state the principle of separating two immiscible liquids by separating funnel. describe an activity with diagram to separate a mixture of water and kerosene oil. answer: immiscible layers separate out in layers depending on their densities in separating funne

if you mean hydrogen and oxygen then water is the product