Question

Ajutati.ma va rog!!!calculati masa de apa si acid azotic pentru a obtine 160 g de solutie de acid azotic de concentratie 21%

Answer 1

ms=160 g sol. HNO3          c=md.100:ms                         se calculeaza md

c=21                                     md=c.ms:100                        din solutie,se

md HNO3                              md=21.160:100                   foloseste formula
mapa                                   md=33,6 g HNO3                 concentratiei

                                           ms=md+mapa

                                            mapa=ms-md
   
                                           mapa=160-33,6=126,4 g