ИК-Фурье-спектроскопическое исследование растворов вольфрамата и молибдата натрия в широком диапазоне рН. <...> FTIR-spectroscopic investigation of sodium tungstate and sodium molybdate solutions in wide range of рH. <...> Ленинградская, 14, Минск, Республика Беларусь, 220030 E-mail: yu_matveychuk@mail.ru ИК-ФУРЬЕ-СПЕКТРОСКОПИЧЕСКОЕ ИССЛЕДОВАНИЕ РАСТВОРОВ ВОЛЬФРАМАТА И МОЛИБДАТА НАТРИЯ В ШИРОКОМ ДИАПАЗОНЕ рН Методом ИК-Фурье-спектроскопии изучены водные растворы Na2WO4 и Na2МоO4 с концентрацией 0,1 моль/л в широком интервале значений фактора кислотности Z (рН). <...> Установлено, что гидролитические и поликонденсационные процессы протекают более глубоко в растворах вольфрама натрия. <...> Matveichuk Department of Analytical Chemistry, Belorussian State University, Chemical Faculty, Leningradskaya st., 14, Minsk, 220030, Republic of Belarus E-mail: yu_matveychuk@mail.ru FTIR-SPECTROSCOPIC INVESTIGATION OF SODIUM TUNGSTATE AND SODIUM MOLYBDATE SOLUTIONS IN WIDE RANGE OF рH A FTIR spectroscopic study of aqueous solutions of sodium tungstate and molybdate (solution concentration was 0.1 mol/l) over a wide pH range (factor (level) of acidity Z, Z = C (H+)/C (WO42-) or Z = C (H+)/C(MoO42-)) was carried out. <...> In solutions of sodium tungstate complex frequency band at 885-865 cm-1 correspoding to the stretching vibrations ν(W-O-W) was fixed. <...> The frequency bands of 1720-1700 cm-1, 990, 985 and 1025 cm-1 corresponding to bending vibrations δ(WOH) were fixed that indicates a significant change in composition of the solution as a result of hydrolytic and polycondensation processes. <...> The sodium molybdate solution has not bands corresponding to the stretching vibrations v(Mo-O-Mo). <...> Only the characteristic bands of the deformation vibrations δ(Mo-OH) were recorded. <...> The low intensity complex band in the area of 885-865 cm-1 corresponding to the stretching vibrations ν(W-O-W) even for freshly prepared 0.1 mol/l sodium tungstate <...>