Răspuns:
Explicație:
c,m= niu/V
V1=0,4L-----> niu1= c1xV1= 3x0,4 mol=1,2mol H2SO4
V2=0,4l----> niu2= c2xV2=2x0,4mol=0,8mol H2SO4
niu3=niu1+niu2= 2mol H2SO4
V3=V1+V2= 0,8L
c3= niu3/V3= 2/0,8mol/l=2,5 M
2mol.............1mol
2NaOH + H2SO4----> Na2SO4 +2H2O
x....................2mol
x= 4molNaOH
M,NaOH= 40g/mol----> m= niuxM=4X40g=160g----este md(m dizolvat)
c=mdx100/ms---> ms= 160x100/40g=400g