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ऐसीटिक अम्ल का आयनन स्थिरांक `1.74xx10^(-5)` है। इसके `0.05M` विलयन में वियोजन की मात्रा, ऐसीटेट आयन सान्द्रता तथा `pH` का परिकलन कीजिए ।

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`CH_(3)COOH hArr CH_(3)COO^(-)+H^(+)`
`{:("प्रारम्भ में सान्द्रता",0.05M,-,-),("साम्यवस्था पर सान्द्रता",(0.05-x)-x,x,):}`
`K=([CH_(3)COO^(-)][H^(+)])/([CH_(3)COOH])`
या `1.74xx10^(-5)=(x.x)/(0.05-x)=(x^(2))/(0.05)` ( `:.x ` बहुत छोटा है)
या `x=(1.74xx10^(-5)xx0.05)^(1//2)`
`=9.33xx10^(-4)`
`:.` वियोजन की मात्रा `=(x)/("मोलों की कुल संख्या")`
`=(9.33xx10^(-4))/(0.05)=0.0187`
`[CH_(3)COO^(-)]=x-9.33xx10^(-4)"mol"L^(-1)`
`[H^(+)]=x-9.33xx10^(-4)"mol"L^(-1)`
`:. pH=-"log"_(10)[H^(+)]=-"log"_(10)(9.33xx10^(-4))`
`=3.03`

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