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W wodzie pH = 7
Po dodaniu NaOH
cOH⁻= 0,01mol/dm³/1dm³ = 10⁻² mol/dm³
pOH = 2
pH = 14 – pOH = 14-2 = 12
12-7 =5 Wzrośnie o 5
9.78
pH = 10
pOH = 14-10 = 4
cOH⁻ = 10⁻⁴mol/dm³
α = cOH*100%/c₀ = 10⁻⁴mol/dm³*100%/0,1mol/dm³ = 0,1%