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Larutan NH4​NO3​ 0,16 M (Kb​=10−5)  memiliki pH sebesar ….

Pertanyaan

Larutan Error converting from MathML to accessible text.  memiliki pH sebesar ….

  1. 5 - log 4 

  2. begin mathsize 14px style 5 minus sign log space square root of 4 end style 

  3. 5 - log 1,6

  4. begin mathsize 14px style 5 minus sign log space square root of 1 , 6 end root end style 

  5. 5 + log 2

A. Chandra

Master Teacher

Mahasiswa/Alumni Universitas Negeri Jakarta

Jawaban terverifikasi

Pembahasan

Reaksi ionisasi dan hidrolisis garam:

begin mathsize 14px style N H subscript 4 N O subscript 3 yields N H subscript 4 to the power of plus plus N O subscript 3 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 14px style open square brackets H to the power of plus sign close square brackets equals 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 open square brackets H to the power of plus sign close square brackets equals 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 1 , 6 cross times 10 to the power of negative sign 1 end exponent close square brackets end root open square brackets H to the power of plus sign close square brackets equals square root of 1 , 6 cross times 10 to the power of negative sign 10 end exponent end root open square brackets H to the power of plus sign close square brackets equals square root of 1 , 6 end root cross times 10 to the power of negative sign 5 end exponent pH equals minus sign log space open square brackets H to the power of plus sign close square brackets pH equals minus sign log space open square brackets square root of 1 , 6 end root cross times 10 to the power of negative sign 5 end exponent close square brackets pH equals 5 minus sign log space square root of 1 , 6 end root   end style 

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