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pH di Soluzioni Acquose di Basi Forti<br />

B (aq)<br />

+ H 2<br />

O (l) OH - (aq) + BH+ (aq) Completa K B → ∞<br />

H 2<br />

O (l)<br />

+ H 2<br />

O (l)<br />

OH - (aq) + H 3 O+ (aq)<br />

K W = [H 3 O + ][OH - ] = 10 -14 M 2<br />

[OH - ] Acqua ≈ 10 -7 M<br />

Se [OH - ] B >> [OH - ] Acqua ≈ 10 -7 M<br />

[OH - ] TOT ≈ [OH - ] B = z [B] 0<br />

[B] 0 = concentrazione iniziale di base<br />

z = numero di moli di OH - dissociate (per mole di reagente)<br />

pOH = -log (z [B] 0 )<br />

1b<br />

pH = 14 - pOH<br />

Basi forti non diluitissime

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