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Suatu larutan penyangga terdiri dari0,1 M CH 3 COOH 1 L(Ka = 10 -5 ) dan 0,1 M NaOH. Volume NaOH yang diperlukan agar memperoleh pH campuran = 5 adalah ...

Suatu larutan penyangga terdiri dari 0,1 M CH3COOH 1 L (Ka = 10-5) dan 0,1 M NaOH. Volume NaOH yang diperlukan agar memperoleh pH campuran = 5 adalah ...

  1. 0,5 L

  2. 1 L

  3. 1,5 L

  4. 2 L

  5. 2,5 L

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A. Ratna

Master Teacher

Mahasiswa/Alumni Universitas Negeri Malang

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Pembahasan

Diketahui: [CH 3 COOH] = 0,1 M ; KaCH 3 COOH = [NaOH] = 0,1 M pH Campuran = 5 Ditanya: Volume NaOH ...? Dijawab: nCH 3 COOH = M x V = 0,1 M x 1 L = 0,1 mmol n NaOH = M x V = 0,1 M x X L = 0,1X mmol pH 5 maka [H + ] = 10 -5

Diketahui: [CH3COOH] = 0,1 M ; Ka CH3COOH = begin mathsize 12px style 1 space x space 10 to the power of negative 5 end exponent end style

                 [NaOH] = 0,1 M 

                 pH Campuran = 5 

Ditanya: Volume NaOH ...?

Dijawab: 

n CH3COOH = M x V = 0,1 M x 1 L = 0,1 mmol 

n NaOH = M x V = 0,1 M x X L = 0,1X mmol 

pH 5 maka [H+] = 10-5

begin mathsize 12px style space space space space space space space space space space space space space space space space space space space space space space space space space space CH subscript 3 COOH space space space space space space space space space plus space space space NaOH space space space space space space space space space space rightwards arrow space CH subscript 3 COONa space plus space straight H subscript 2 straight O Mula minus mula colon space space 0 comma 1 space m m o l space space space space space space space space space space space space space space space space space space 0 comma 1 X space m m o l Bereaksi space space space space space space colon space 0 comma 1 X space m m o l space space space space space space space space space space space space space space space 0 comma 1 X space m m o l space space space space space space space space 0 comma 1 X space m m o l space Sisa space space space space space space space space space space space space space colon space left parenthesis 0 comma 1 space minus space 0 comma 1 X right parenthesis m m o l space space space space space space space space space minus space space space space space space space space space space space space space space space space space space space 0 comma 1 X space m m o l  left square bracket H to the power of plus right square bracket space equals space K subscript a space x space fraction numerator n space A s a m over denominator n space B a s a space K o n j u g a s i end fraction 1 space x space 10 to the power of negative 5 end exponent space equals space 1 space x space 10 to the power of negative 5 end exponent space x space fraction numerator left parenthesis 0 comma 1 space minus space 0 comma 1 X right parenthesis space over denominator 0 comma 1 X space end fraction 1 space equals space fraction numerator left parenthesis 0 comma 1 space minus space 0 comma 1 X right parenthesis over denominator 0 comma 1 X end fraction 0 comma 1 X space equals space 0 comma 1 space minus space 0 comma 1 X space 0 comma 2 X space equals space 0 comma 1 space X space equals space fraction numerator 0 comma 1 over denominator 0 comma 2 space end fraction equals space 0 comma 5 space L space end style

 

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