Question

DEtermina masa de acetona necesara pregatirii a 500 g de solutie de concentratie 30% . Ce masă de apă se foloseste?

Answer 1

[tex]Raspuns:\\ ms=500g\\ C=30\%\\ -------\\ md=?\\ ma=?\\ ~-------\\ C= \frac{md}{ms} *100\\ \boxed{md= \frac{C*ms}{100}} \\ ms=md+ma\\ \boxed{ma=ms-md}\\\\ Inlocuim:\\ md= \frac{30*500}{100} \\ md= \frac{15000}{100} \\ \boxed{md=150g} ma=500g-150g\\ \boxed{ma=350g} [/tex]