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pH = 1
cH⁺ = 0,1mol/dm³
nH⁺ = cH⁺*V nH⁺ = 0,1mol/dm³*0,2dm³= 0,02mola
liczba moli OH⁻ z zasady
nOH⁻ = cOH⁻*V
nOH⁻ = 0,1mol/dm³*0,1dm³= 0,01mola
H⁺ + OH⁻ → H₂O
W roztworze pozostanie
nH⁺ = 0,02-0,01 = 0,01mola
Vroztworu = 0,2dm³ + 0,1dm³ = 0,3dm³
cH⁺ = 0,01mola/0,3dm³ =0,03(3)mol/dm³
pH = -log0,03(3)=1,477