Solubility is not to be confused with the ability to 'dissolve' a substance, because the solution might also occur because of a chemical reaction. For example, zinc 'dissolves' (with effervescence) in hydrochloric acid as a result of a chemical reaction releasing hydrogen gas in a displacement reaction.
All three kidney, liver and lungs purify the blood. The lungs help remove carbon dioxide, the kidneys remove water-soluble waste and the liver removes fat soluble wastes and many other impurities from the blood....ref:http://www.pharmainfo.net/answers/pharmaquestion/which-organ-purifies-blood.
The heart is the pump that maintains the circulation of blood. 1. Pulmonary circuit carries deoxygenated blood from the heart to the lungs and back to the heart. 2. Systemic circuit carries oxygenated blood from the heart to all the other peripheral tissues and back to the heart.