Formaldehyde is a colorless, flammable, strong-smelling chemical that is used in building materials and to produce many household products.ormaldehyde is a colorless, flammable, strong-smelling chemical that is used in building materials and to produce many household products.
Actually most of the salts are insoluble in water. Not all the salts include chloride!!! And of those witch contain chloride, silver, led and mercury salts are insoluble!!! chemically speaking, not all salts are soluble in a particular solvent under normal conditions..
If an insoluble salt forms by the reaction of soluble substances in water and falls out of solution, we call it a precipitate (see image). Common insoluble (sparingly soluble) salts are carbonates, hydroxides, sulfates, and sulfides.