Question

Cate grame NaOH sunt necesare pentru a obtine 2 L solutie de concentratie procentuala 28% (densitate=1,31 g/cm³) ? Calculati normalitatea si molaritatea solutiei de NaOH (Masele atomice: Na=23, O=16, H=1)

Answer 1

c=mdx100/ms

ms= ro x v= 2000cm³x1,31g/cm³=2620 g

md= 28x2620/100g=733,6 gNaOH

niu,moli=niu,echiv.gr=>m/M= 733,6/40=18,34

c,molara= niu,mol/V=18,34/2=............................

c,normala= niu,echiv.gr/V=18,34/2=.......................