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Jika diketahui , maka pH larutan CH 3 ​ COONa 0,4 M adalah ….

Jika diketahui begin mathsize 14px style K subscript a C H subscript 3 C O O H equals 10 to the power of negative sign 5 end exponent end style, maka pH larutan 0,4 M adalah ….

 

  1. begin mathsize 14px style 9 plus log invisible function application 2 end style

  2. begin mathsize 14px style 8 plus log invisible function application 4 end style

  3. begin mathsize 14px style 8 plus log invisible function application 2 end style

  4. begin mathsize 14px style 9 minus log invisible function application 2 end style

  5. begin mathsize 14px style 8 minus log invisible function application 4 end style

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A. Chandra

Master Teacher

Mahasiswa/Alumni Universitas Negeri Jakarta

Jawaban terverifikasi

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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 14px 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 14px style open square brackets O H to the power of minus sign close square brackets equals square root of K subscript w over K subscript a cross times open square brackets C H subscript 3 C O O to the power of minus sign close square brackets end root open square brackets O H to the power of minus 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 4 cross times 10 to the power of negative sign 1 end exponent close square brackets end root open square brackets O H to the power of minus sign close square brackets equals square root of 4 cross times 10 to the power of negative sign 10 end exponent end root open square brackets O H to the power of minus sign close square brackets equals 2 cross times 10 to the power of negative sign 5 end exponent pOH equals minus sign log invisible function application open square brackets O H to the power of minus sign close square brackets pOH equals minus sign log invisible function application open square brackets 2 cross times 10 to the power of negative sign 5 end exponent close square brackets pOH equals 5 minus sign log invisible function application 2 pH equals 14 minus sign pOH pH equals 14 minus sign open parentheses 5 minus sign log invisible function application 2 close parentheses pH equals 9 plus log invisible function application 2 end style 

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