when do we say that a solution is unsaturated
Saturated and unsaturated compounds In organic chemistry, a saturated compound is a chemical compound that has a chain of carbon atoms linked together by single bonds.[1] Alkanes are saturated hydrocarbons. An unsaturated compound is a chemical compound that contains carbon-carbon double bonds or triple bonds, such as those found in alkenes or alkynes, respectively. Saturated and unsaturated compounds need not consist only of a carbon atom chain. They can form straight chain, branched chain, or ring arrangements. They can have functional groups, as well. It is in this sense that fatty acids are classified as saturated or unsaturated. The amount of unsaturation of a fatty acid can be determined by finding its iodine number.
Phosphate-buffered saline There are many different ways to prepare PBS solutions (one of them is DPBS, or Dulbecco's phosphate-buffered saline, which has a lower phosphate concentration than standard PBS[1]). Some formulations do not contain potassium and magnesium, while other ones contain calcium and/or magnesium.[2]