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Pertanyaan

Hitung pH larutan H C O O N H subscript 4 0,1 M, jika Ka space H C O O H equals 4 cross times 10 to the power of negative sign 3 end exponent dan begin mathsize 14px style Kb space N H subscript 3 equals space 10 to the power of negative sign 5 end exponent end style!

I. Solichah

Master Teacher

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Jawaban

pH larutan begin mathsize 14px style H C O O N H subscript 4 end style adalah 6 - log 2.

Pembahasan

Larutan begin mathsize 14px style H C O O N H subscript 4 end style terbuat dari larutan asam lemah begin mathsize 14px style H C O O H end style dan basa lemah begin mathsize 14px style N H subscript 3 end style. Oleh karena itu, larutan begin mathsize 14px style H C O O N H subscript 4 end style mengalami hidrolisis total.

Untuk menghitung pH, maka harus mencari nilai begin mathsize 14px style open square brackets H to the power of plus sign close square brackets end style terlebih dahulu. Rumus begin mathsize 14px style open square brackets H to the power of plus sign close square brackets end style untuk hidrolisis total adalah:


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 begin inline style fraction numerator Kw cross times Ka over denominator Kb end fraction end style end root end cell row blank equals cell square root of begin inline style fraction numerator left parenthesis 1 cross times 10 to the power of negative sign 14 end exponent right parenthesis cross times left parenthesis 4 cross times 10 to the power of negative sign 3 end exponent right parenthesis over denominator 1 cross times 10 to the power of negative sign 5 end exponent end fraction end style end root end cell row blank equals cell square root of 4 cross times 10 to the power of negative sign 12 end exponent end root end cell row blank equals cell 2 cross times 10 to the power of negative sign 6 end exponent space M end cell end table 


Nilai pH adalah

begin mathsize 14px style table attributes columnalign right center left columnspacing 0px end attributes row pH equals cell negative sign log space open square brackets H to the power of plus sign close square brackets end cell row blank equals cell negative sign space log space 2 cross times 10 to the power of negative sign 6 end exponent end cell row blank equals cell 6 minus sign log space 2 end cell end table end style


Jadi, pH larutan begin mathsize 14px style H C O O N H subscript 4 end style adalah 6 - log 2.

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