Question

ms=24,5 gr. H2SO4
Cp=20%
Vs=200cm3

Cm=?

Answer 1

Notez "*" înmulțire si "/" linia de fractie
ms=24.5g H2So4
Cp=20%
Vs=200cm3=0.2L
Cp=md/ms*100 =>md=Cp*ms/100=20*24.5/100=4.9g Cm=md/M*Vs(L)=4.9/98*02=0.25 moli/L
MH2SO4=2*1g+32g+16*4g=98g/mol
M-masa moleculara,g/mol
m-masa,g
Cm=concentratia molara,mol/L
Vs=Volumul solutiei,L
md-masa substanței dizolvate,g
ms-masa solutiei,g