tag:blogger.com,1999:blog-2073081399571524950.post7218135768496573472..comments2024-02-29T22:28:41.458+02:00Comments on formuleonline: Cate grame de sulfat de cupru cristalizat sunt necesare pentru a prepara 200 g solutie 10% de CuSO4? Ce volum de apa trebuie adaugat pentru a se obtine o solutie de 10%? (ρH2O = 1g/cm3)Unknownnoreply@blogger.comBlogger1125tag:blogger.com,1999:blog-2073081399571524950.post-46861966774643892352021-11-21T12:39:38.979+02:002021-11-21T12:39:38.979+02:00 Se prepara 500 ml solutie etalon de azot de 1000 ... Se prepara 500 ml solutie etalon de azot de 1000 mg/l ( de rezerva) pornind de la azotat de potasiu (KNO3). In acest scop solutia e adusa la masa constanta prin pastrare la 105 0 C timp de 2 ore , racita , cantarita , iar la final este dizolvata in cca. 400ml apa distilata .Solutia obtinuta se completeaza la 500 ml cu apa distilata , in balon cotat , apoi se omogenizeaza . Sa se calculeze:<br />Anonymoushttps://www.blogger.com/profile/10112209696189078609noreply@blogger.com