Question

se supun evaporarii 800 g solutie de zahar de concentratie 50%: a)Calculatoi concentratia solutiei finale daca se evapora 400 g apa b) Calculati cencentratia solutiei finale daca se adauga 400g c) Calculati concentratia solutiei finale daca se amesteca prima solutie cu 200 g solutie zahar concentratie 10%

VA ROG MULT DAU 50 PUNCTE

Answer 1

ms1=800g
C1=50%
C1=(md1×100)/ms1=>md1=(c1×ms1)/100=(50×800)/100=400g
a)ms=ms1-m apă(evaporată)= 800-400=400g
C=(md×100)/ms=(400×100)/400=100%
b)ms=ms1+ m (adăugată)=800+400=1200g
C=(md×100)ms= (400×100)1200=33,33%
c)ms2=200g
C2=10%
C2=(md2×100)/ms2=> md2=(c2×ms2)/100=(10×200)/100=20g
ms=ms1+ms2=800+200=1000g
md=md1+md2=400+20=420g
C=(md×100)/ms=(420×100)/1000=42%