Neste trabalho, usando o processo de coacervação, foi estudado o sistema NaPO3/AgNO3/H2O. Determinou-se o domínio de coacervação a partir de diferentes concentrações de NaPO3 e AgNO3 e a influência do pH na estabilização do coacervato foi determinada. Os coacervatos obtidos em pH ~ 5 apresentam maior região de estabilidade.

In this work, using coacervation process, the influence of the pH in the stability of the coacervates of the NaPO3/AgNO3/H2O system was studied. The coacervate domain was established using different concentrations of NaPO3 and AgNO3 and the influence of the pH in the stability of the coacervate was putfoward. The coacervates obtained at pH ~ 5 present highest stability.

Unusual chemical phenomenon associated with ultrasound is on account of cavitation effect. The ultrasound increase the rate and yield of chemical reaction on account of its ability to emulsify liquids. When the ultrasound is used in metallic catalyst reaction the activity of catalyst is increased because the ultrasound clean the surface of catalyst. Sonogels have a fine porosity and large specific surface improving different properties. This paper deals with ultrasound phenomenon and gives some examples of reactions and properties where this radiation takes an important role.