Question

what is the water of crystallisation for barium chloride ​

Answer 1

➢Efflorescence is the process in which a substance absorbs moisture from atmosphere to form crystal.

Answer 2

Answer:

many iconic compounds crystallize out of solution with water molecules inserted in regular position throughout their crystal lattice structures. A compound with inserted water molecules is called a hydrate.

The number of water molecules present per formula unit of a compound is indicated in the formula by adding a "dots", followed by the number of water molecules. for example, the formula for hydrated copper sulfate would be written as: CU SO4 . 5 H2O.

the number of water molecules present in a barium chloride hydrate can be calculated by dividing the moles of water (H2O) in the hydrate by the moles of the salt (Bacl2) in the hydrate.

Determine the mass of the barium chloride Salt and the mass of the water molecules:

Step 1 : heat a sample of barium chloride hydrate.

Let's use a 1.250 g sample of barium chloride hydrate. this would be the mass of the barium chloride Salt and the attached water molecules.

Step 2 : heating causes the water molecules to detach and evaporate. so, if we weigh our sample after heating, we we will have the mass of just the barium chloride salt. after heating our sample weigh 1.060 g Bacl2.

Step 3 : if we subtract the mass of our sample after heating from the mass of our sample before heating, we will have the mass of just the water molecules.

1.250 g - 1.060 g =0.190 g h2O