Kemi, Beregn pH.

pK_s(HSO₄^-) = 1,92 dvs middelstærk syre.

                 pH = -log((-K_s + √(K_s² + 4·K_s·c_s))/2)

                 pH = -log((-10^-pK_s + √(10^-2·pK_s + 4·10^-pK_s·c_s))/2)

                 pH = -log((-10^-1,92 + √(10^-3,84 + 4·10^-1,92·0,6))/2)

fortyndingsfaktor
                                 f = ((500 mL) + (300 mL)) / (500 mL) = 1,6

                                 c_s-fortyndet = c_s / f = (0,6 M) / 1,6 ≈ 0,375 M

alment

for en ikke stærk, monohydron syre S
med protolysegraden 0 < α < 1
og formel koncentration c
gælder:

                                                           S _(aq)   +   H₂O _(l)   <--->   B _(aq)   +   H₃O⁺ _(aq)
              ligevægtsmolariteter:          (1-α)·c                                 α·c            α·c    

med
              ligevægtsbrøken
                                                                     [B] • [H₃O⁺]
                                                                    ----------------- = K_s
                                                                            [S]

.           
                                                                      (α·c)²
                                                                    ---------- = K_s
                                                                     (1-α)·c

                                                                            α²
                                                                    c • -------- = 10^-pK_s
                                                                          1 - α