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..
Sulphates are usually soluble in water except for Ag2SO4, BaSO4, CaSO4 and PbSO4 (lead sulphate).Hope that helps (: PbSO4 is sparingly soluble in water, its solubility at 298K is about 1.4E-4 mol/L, a very small value. So its not insoluble, it just has a very small solubility.lthough the anion (SO4 2-) is found on the solubility chart, you must remember that there are exceptions i.e. the silver group (Silver ion-A â¦ g+, Mercury (I) ion-Hg2 2+, and Lead (II) ion-Pb 2+) Since the Lead (II) cation is in the chemical formula Lead (II) Sulfate (PbSO4), it will be INSOLUBLE in water.