Larutan  akan memiliki pH sebesar ….

Pertanyaan

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

  1. begin mathsize 14px style 6 minus sign log space 4 , 4 end style 

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

  3. begin mathsize 14px style 6 minus sign log space 8 , 7 end style 

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

  5. begin mathsize 14px style 6 minus sign log space square root of 8 , 7 end root end style 

A. Chandra

Master Teacher

Mahasiswa/Alumni Universitas Negeri Jakarta

Jawaban terverifikasi

Pembahasan

Reaksi ionisasi dan hidrolisis garam:

begin mathsize 14px style open parentheses C H subscript 3 N H subscript 3 close parentheses subscript 2 S O subscript 4 yields 2 C H subscript 3 N H subscript 3 to the power of plus plus S O subscript 4 to the power of 2 minus sign end exponent C H subscript 3 N H subscript 3 to the power of plus plus H subscript 2 O equilibrium C H subscript 3 N H subscript 3 O H and H to the power of plus sign end style 

Spesi begin mathsize 14px style C H subscript 3 N H subscript 3 O H end style adalah begin mathsize 14px style C H subscript 3 N H subscript 2 end style  dalam air. 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 C H subscript 3 N H subscript 3 to the power of plus close square brackets end root end style 

Jangan lupa, ion yang terhidrolisis terbentuk 2 kali dari konsentrasi garam sehingga

begin mathsize 14px style open square brackets H to the power of plus sign close square brackets equals square root of fraction numerator 10 to the power of negative sign 14 end exponent over denominator 4 , 6 cross times 10 to the power of negative sign 4 end exponent end fraction cross times open square brackets 2 cross times 10 to the power of negative sign 1 end exponent close square brackets cross times 2 end root open square brackets H to the power of plus sign close square brackets equals square root of 0 , 87 cross times 10 to the power of negative sign 11 end exponent end root open square brackets H to the power of plus sign close square brackets equals square root of 8 , 7 cross times 10 to the power of negative sign 12 end exponent end root open square brackets H to the power of plus sign close square brackets equals square root of 8 , 7 end root cross times 10 to the power of negative sign 6 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 8 , 7 end root cross times 10 to the power of negative sign 6 end exponent close square brackets pH equals 6 minus sign log space square root of 8 , 7 end root   end style 

 

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Jika padatan suatu garam asam ingin dibuat menjadi dua larutan masing-masing 100 mL dengan berturut-turut pH=4,5 dan pH=5, rasio massa yang dilarutkan adalah ….

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