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Jika diketahui K a ​ CH 3 ​ COOH = 1 0 − 5 , maka pH larutan CH 3 ​ COONa 0,004 M adalah …

Jika diketahui , maka pH larutan 0,004 M adalah …

  1. 8 + log⁡4

  2. 8 + log⁡5

  3. 6 - log⁡2

  4. 8 - log⁡2

  5. 8 + log⁡2

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A. Chandra

Master Teacher

Mahasiswa/Alumni Universitas Negeri Jakarta

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Pembahasan

Reaksi ionisasi dan hidrolisis garam: Garam diketahui bersifat basa sehingga persamaan matematis hidrolisisnya menjadi

Reaksi ionisasi dan hidrolisis garam:

begin mathsize 12px style C H subscript 3 C O O Na yields C H subscript 3 C O O to the power of minus sign and Na to the power of plus sign C H subscript 3 C O O to the power of minus sign and H subscript 2 O equilibrium C H subscript 3 C O O H and O H to the power of minus sign end style

Garam diketahui bersifat basa sehingga persamaan matematis hidrolisisnya menjadi

begin mathsize 12px style table attributes columnalign right center left columnspacing 0px end attributes row cell open square brackets O H to the power of minus sign close square brackets end cell equals cell square root of K subscript italic w over K subscript italic a cross times open square brackets C H subscript 3 C O O to the power of minus sign close square brackets end root end cell row cell open square brackets O H to the power of minus sign close square brackets end cell equals cell square root of 10 to the power of negative sign 14 end exponent over 10 to the power of negative sign 5 end exponent cross times open square brackets 4 cross times 10 to the power of negative sign 3 end exponent close square brackets end root end cell row cell open square brackets O H to the power of minus sign close square brackets end cell equals cell square root of 4 cross times 10 to the power of negative sign 12 end exponent end root end cell row cell open square brackets O H to the power of minus sign close square brackets end cell equals cell 2 cross times 10 to the power of negative sign 6 end exponent end cell row pOH equals cell negative sign log invisible function application open square brackets O H to the power of minus sign close square brackets end cell row pOH equals cell negative sign log invisible function application open square brackets 2 cross times 10 to the power of negative sign 6 end exponent close square brackets end cell row pOH equals cell 6 minus sign log invisible function application 2 end cell row pH equals cell 14 minus sign pOH space end cell row pH equals cell 14 minus sign left parenthesis 6 minus sign log invisible function application 2 space right parenthesis space end cell row pH equals cell 8 plus log invisible function application 2 end cell end table end style

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Muhammad Ryamizard Haqqi

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Pada suatu laboratorium terdapat larutan asam lemah seperti berikut. HF , K a ​ = 6 , 3 × 1 0 − 4 CH 3 ​ COOH , K a ​ = 1 , 7 × 1 0 − 5 H 2 ​ C 2 ​ O 4 ​ , K a 1 ​ = 5 , 9 × 1 0 − 2 , K a ...

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