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Pertanyaan

Larutan NH 4 ​ Cl 0 , 4 M ( K b ​ = 1 0 − 5 ) memiliki pH sebesar ….

Larutan memiliki pH sebesar ….

  1. 2 - log⁡5

  2. 5 - log⁡4

  3. 8 + log⁡2

  4. 5 - log⁡2

  5. 5 + log⁡2

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A. Chandra

Master Teacher

Mahasiswa/Alumni Universitas Negeri Jakarta

Jawaban terverifikasi

Pembahasan

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

Reaksi ionisasi dan hidrolisis garam:

begin mathsize 12px style N H subscript 4 Cl yields N H subscript 4 to the power of plus plus Cl to the power of minus sign N H subscript 4 to the power of plus plus H subscript 2 O equilibrium N H subscript 4 O H and H to the power of plus sign end style

Garam diketahui bersifat asam sehingga persamaan matematis hidrolisisnya menjadi

begin mathsize 12px style table attributes columnalign right center left columnspacing 0px end attributes row cell open square brackets H to the power of plus sign close square brackets end cell equals cell square root of K subscript italic w over K subscript italic b cross times open square brackets N H subscript 4 to the power of plus close square brackets end root end cell row cell open square brackets H to the power of plus 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 1 end exponent close square brackets end root end cell row cell open square brackets H to the power of plus sign close square brackets end cell equals cell square root of 4 cross times 10 to the power of negative sign 10 end exponent end root end cell row cell open square brackets H to the power of plus sign close square brackets end cell equals cell 2 cross times 10 to the power of negative sign 5 end exponent end cell row pH equals cell negative sign log invisible function application open square brackets H to the power of plus sign close square brackets end cell row pH equals cell negative sign log invisible function application open square brackets 2 cross times 10 to the power of negative sign 5 end exponent close square brackets end cell row pH equals cell 5 minus sign log invisible function application 2 end cell end table end style

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Banyaknya ( NH 4 ​ ) 2 ​ SO 4 ​ ( M r ​ = 132 ) ( K b ​ NH 4 ​ OH = 2 × 1 0 − 5 ) yang harus dimasukkan kedalam 100 mL larutan agar di peroleh pH = 4,5 adalah ….

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5.0

Jawaban terverifikasi

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