Nitrate test to 2.5 micrograms and a concentration of 1 in 25,000 parts. Devarda's alloy (Copper/Aluminium/Zinc) is a reducing agent. When reacted with nitrate in sodium hydroxide solution, ammonia is liberated. The ammonia formed may be detected by its characteristic odor, and by damp red litmus paper's turning blue, signalling that it is an alkali — very few gases other than ammonia evolved from wet chemistry are alkaline. Aluminium is the reducing agent in this reaction that will occur. Diphenylamine may be used as a wet chemical test for the presence of the nitrate ion. In this test, a solution of diphenylamine
Dissociation (chemistry) variously named a "dissociation constant", an "acid ionization constant", an "acidity constant" or an "ionization constant". It serves as an indicator of the acid strength: stronger acids have a higher "K" value (and a lower p"K" value). Fragmentation of a molecule can take place by a process of heterolysis or homolysis. Receptors are proteins that bind small ligands. The dissociation constant "K" is used as indicator of the affinity of the ligand to the receptor. The higher the affinity of the ligand for the receptor the lower the "K" value (and the higher the p"K" value). Dissociation (chemistry) Dissociation in