Question

Calculati masa de substanta dizolvata necesara pentru a obtine:
b)700 g solutie 25%
c)800g solutie 98%

Answer 1

masa substanta dizolvata=md
concentratie=c
masa solutie=ms

c=(md/ms)*100

md=(c*ms)/100

a) md=(25*700)/100=175 g

b) md=(98*800)/100=784 g