Jawab: Misalkan massa larutan = 100 gr, maka 25 % massa H2SO4 = 25/100 x 100 gr = 25 gr n H2SO4 = m/Mr n H2SO4 = 25 g/98 g mol-1 n H2SO4 = 0,255 mol V = m/ρ V= 100 g/(1,178 g/mL) V = 84,89 mL V = 0,08489 L M = n/V M = 0,255 mol/0,08489 L M = 3,00 mol/L molaritas larutan H2SO4 25 % adalah 3,00 mol/L
m = 25%
Mr H₂SO₄= 98
ρ = 1,178 g/mL.
dit : M .. ?
Jawab: Misalkan massa larutan = 100 gr, maka 25 % massa H2SO4 = 25/100 x 100 gr = 25 gr
n H2SO4 = m/Mr
n H2SO4 = 25 g/98 g mol-1
n H2SO4 = 0,255 mol
V = m/ρ
V= 100 g/(1,178 g/mL)
V = 84,89 mL
V = 0,08489 L
M = n/V
M = 0,255 mol/0,08489 L
M = 3,00 mol/L
molaritas larutan H2SO4 25 % adalah 3,00 mol/L