Question

Din reactia a 20 g de NaOH cu 30 de g solutie de H2SO4 de concentratie 49% rezulta o solutie cu concentratie procentuala in Na2SO4 de:

Answer 1

md=30*49/100=14.7g H2SO4

mH2O=ms-md=30-14.7=15.3g H2O

20-12=8g NaOH raman nereactionat

80g..........98g................142g..........36g
2NaOH + H2SO4 ---> Na2SO4 + 2H2O
12g...........14.7g...........x=21.3g......y=5.4g

mH2O final = 5.4+15.3=20.7g

msf=20.7+21.3+8=50g

Cp=md*100/ms=2130/50=42.6% sol. Na2SO4