A 1.88-g sample of NiCl₂ • x H₂O was heated until the water is removed. Upon weighing again, the anhydrous salt was determined to have a mass of 1.024 g. Calculate the value of x for NiCl₂ • x H₂O.

Name the following hydrated ionic compound: Ca(BrO₃)₂ • H₂O.

Give the chemical formula of the following hydrated ionic substance: nickel (II) phosphate octahydrate.

The hydrated ionic compound tin (IV) chloride has a formula of SnCl₄•xH₂O. Upon heating, 2.20 g of water was removed and 6.36 g of the sample remained. Determine the number of waters of hydration (x) in the hydrated compound.