Question

va rog frumos problema 35!!!!!​

Answer 1

Vs.NaOH = 84,6 mL = 0,0846 L

Cm.NaOH = 2 mol/L

stim ca Cm = niu/Vs

=> niu = CmxVs

= 0,0846x2 = 0,1692 moli NaOH

0,1692 moli       md g

     2NaOH  +  H2SO4 --> Na2SO4 + 2H2O

        2                  98

=> md = 0,1692x98/2 = 8,291 g H2SO4

Vs.H2SO4 = 5 mL

ro.H2SO4 = 1,8 g/mL

stim ca ro = ms/Vs

=> ms = roxVs = 1,8x5 = 9 g sol. H2SO4

stim ca c% = mdx100/ms

= 8,291x100/9 = 92,12%