Question

m1(sol)=250g =>
c1(KOTH)=20% => c2(KOH)=?
+m(H20)=200g​

Answer 1

Răspuns:

Explicație:

m1=250g sol. KOH

c1= 20%

mapa adaug. = 200g

c2  = ?

-se afla  md   solutiei

c1= md .100 : ms1

md= c1 . ms1 : 100

md=    20 . 250 : 100=50 g KOH

-se afla ms2

ms2 = ms1 + mapa adaug.

ms2= 250 + 200= 450 g sol. KOH

-se afla c2

c2= md .100 : ms2

c2= 50 . 100 : 450= 11,11 %