Question

pentru a prepara 100 g de saramura de concentratie procentuala 5%sunt necesare ....g apa.5 sau 95

Answer 1

ms =100 g                   c= md .100 :ms
c=5  la suta                   md=c.ms :100
m apa =?                     md=5.100:100

                                    md=5 g
                             
                                    ms=md +mapa
        
                                    mapa=ms-md

                                    mapa=100-5=95 g