Chloride soluble or insoluble in water?

Answer 1

In solid, a chloride ion is bound with a singly-charged positive ion (or two chloride ions with a doubly-charged positive ion). Examples are NaCl, CaCl2, etc. When these salts are added in water, the +ve ions and -ve ions are separated -- the salt dissolves in water and the clear solution can be colorless (e.g. NaCl) or colored (e.g. CuCl2), depends on the type of positive ion. A few chloride ions exist in air, but will not last too long, because negative ions will be attracted to positive ions in air to form solid (like dust).