It is insoluble in water, somewhat soluble in ethanol, soluble in benzene, and very soluble in ether, chloroform, or carbon disulfide. Naphthalene is obtained from coal tar, a byproduct of the coking of coal.
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Naphthalene is more soluble in petroleum ether than in water because naphthalene is nonpolar and petroleum ether is also nonpolar. Like dissolves like, so nonpolar solvents like petroleum ether are better able to dissolve nonpolar solutes like naphthalene. Water is a polar solvent and does not interact well with nonpolar solutes like naphthalene, resulting in low solubility.
One way is to dissolve the ammonium chloride in water, then recover the ammonium chloride by evaporation; the naphthalene will not dissolve in water in any substantial quantity.
To stop it from blowing up.
Liquid naphthalene is typically obtained by melting solid naphthalene. This can be done by heating solid naphthalene to around 80 degrees Celsius until it liquefies. It is important to handle naphthalene with care as it is toxic and flammable.
Naphthalene is a white crystalline solid with a distinctive mothball odor. It has a melting point of 80.2°C and a boiling point of 218°C. It is insoluble in water but soluble in organic solvents.