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^-#.
Acids provide the H + ion; bases provide the OH-ion; and these ions combine to form water. H+(aq) + OH-(aq) H2O(l). The Arrhenius theory has several disadvantages. 1  It can be applied only to reactions that occur in water because it defines acids and bases in terms of what happens when compounds dissolve in water.rrhenius acids include compounds such as HCl, HCN, and H 2 SO 4 that ionize in water to give the H + ion. Arrhenius bases include ionic compounds that contain the OH-ion, such as NaOH, KOH, and Ca(OH) 2.