Question

Se obține un amestec din:
- 30g soluție H2SO4 20%
- 60g solutie H2SO4 40%
- 25g solutie H2SO4 18%
- 40g solutie H2SO4 80%
Calculati concentratia procentuala a amestecului.

Answer 1

m(1)=30g•20%/100%=6g
m(2)=60g•40%/100%=24g
m(3)=25g•18%/100%=4.5g
m(4)=40g•80%/100%=32g
m(tot.)=66.5g
M(sol.tot.)=155g
c=66.5/155•100%=43%