Question

Se amesteca 100g solutie H2SO4 90%
Densitatea= 1,84 g/cm^3 cu 200g sol H2SO4 20 % densitatea = 1,14
Calculati concentratia procentuala si molara

Answer 1

C= mdx100/ms       C,m=n(niu)/V(L)

C1=90%,                  ms1=100g------->  md1= c1xms1/100=90g
c2=20%                    ms2= 200g------>   md2= 40g
                                 ms3= 300g............md3= 130g
c3= md3x100/ms3= 130x100/300=..........................calculeaza !!!!

n(niu)= m/M---> n,H2SO4= 130g/98g/mol=1,326mol
V3= V1+V2= m1/ro1  + m2/ro2=100/1,84+ 200/1,14=54,35ml +175,44ml=
c= 1,326,mol/ 0,230(l)=.....................calculeaza)