Definition of IGM. 1. : a class of immunoglobulins of high molecular weight including the primary antibodies that are released into the blood early in the immune response to be replaced later by IgG and that are highly efficient in binding complement.2.: an antibody of the class IgM.ADVERTISEMENT.efinition of IGM. 1. : a class of immunoglobulins of high molecular weight including the primary antibodies that are released into the blood early in the immune response to be replaced later by IgG and that are highly efficient in binding complement. 2. : an antibody of the class IgM. ADVERTISEMENT.
Calcium hydroxide is an Arrhenius base. You can see that it consists of a cation (we know calcium should be a cation because it is a metal on the left side of the periodic table bonded to elements on the right side). The anions are hydroxyl groups. #Ca(OH)_2->Ca^(2+)+2OH^-#.
Arrhenius defined an acid is any substance that produces H+ ions or H3O+ ions in water. Compare this with the definition of an alkali or base. H+ ions are called hydrogen ions, H3O+ ions are called hydroxonium ions. You will mostly see acids in reactions forming H+ ions.In reality, H+ is a single proton, and does not exist on its own.ompare this with the definition of an alkali or base. H+ ions are called hydrogen ions, H3O+ ions are called hydroxonium ions. You will mostly see acids in reactions forming H+ ions. In reality, H+ is a single proton, and does not exist on its own.