Al-Saidi M. Z. T. RussiaSaratovSSU. Institute of Chemistry., 410012, Saratov, Astrakhanskaya str., 83, building. 1, Institute of Chemistry, SSUаспирантm19z73@yahoo.com Author's articles Synthesis and Spectroscopic Study of Some Phenylazonaphthols Effect of Temperature, Isotopic Composition of Water and Ethanol on the Tautomeric Equilibrium of Sulphonated Phenylazonaphtholes