Alkalinity or AT's a measure of the ability of a solution to neutralize acids to the equivalence point of carbonate or bicarbonate. Alkalinity's closely related to the acid neutralizing capacity (ANC) of a solution and ANC's often incorrectly used to refer to alkalinity. The alkalinity's equal to the stoichiometric sum of the bases in solution. In the natural environment carbonate alkalinity tends to make up most of the total alkalinity due to the common occurrence and dissolution of carbonate r… (More on Alkalinity)