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Ke dalam 100 mL larutan CH 3 COOH 0,2 M (Ka = 1 x 10 -5 ) ditambahkan 100 mL larutan NaOH 0,2 M sehingga terjadi reaksi : CH 3 ​ COOH ( aq ) + NaOH ( aq ) → CH 3 COONa ( aq ) + H 2 ​ O ( l ) Harga pH larutan yang terjadi sebesar ....(Kw = 10 -14)

Ke dalam 100 mL larutan CH3COOH 0,2 M (Ka = 1 x 10-5) ditambahkan 100 mL larutan NaOH 0,2 M sehingga terjadi reaksi :

Harga pH larutan yang terjadi sebesar ....(Kw = 10-14)

  1. 5

  2. 6

  3. 9

  4. 10

  5. 11

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M. Robo

Master Teacher

Jawaban terverifikasi

Pembahasan

CH 3 COOH + NaOH CH 3 COONa + H 2 O Mula 20 mmol 20 mmol Reaksi -20 mmol -20 mmol +20 mmol +20 mmol Sisa 0 0 20 mmol 20 mmol CH 3 COONa merupakan garam basa, sehingga : pOH = - log 10 -5 = 5 pH = 14 – pOH pH = 14 – 5 = 9

 

CH3COOH     +      NaOH     rightwards arrow  CH3COONa    +      H2O

Mula

20 mmol              20 mmol

 

Reaksi

-20 mmol            -20 mmol

+20 mmol             +20 mmol

Sisa

0                          0

20 mmol                20 mmol

left square bracket CH subscript 3 COONa right square bracket space equals space fraction numerator mol over denominator straight V space total end fraction space equals space fraction numerator 0 comma 02 space mol over denominator 0 comma 2 space straight L end fraction space equals space 0 comma 1 space straight M

CH3COONa merupakan garam basa, sehingga :

left square bracket OH to the power of minus right square bracket space equals space square root of fraction numerator Kw space cross times space left square bracket garam right square bracket over denominator Ka end fraction end root space equals space square root of fraction numerator 10 to the power of negative 14 end exponent cross times left square bracket 0 comma 1 right square bracket over denominator 10 to the power of negative 5 end exponent end fraction end root space equals space square root of 10 to the power of negative 10 end exponent end root space equals space 10 to the power of negative 5 space end exponent straight M

pOH = - log 10-5 = 5

pH = 14 – pOH

pH = 14 – 5 = 9

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Hitunglah pH larutan CH 3 ​ COONa 0,008 M sebanyak 100 mL. Jika K a ​ CH 3 ​ COOH = 2 × 1 0 − 5 .

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