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Jika dua larutan yang masing-masing mengandung 25 ml NaOH 0,2 M dan 25 ml CH 3 COOH 0,2 M (Ka CH 3 COOH = 1 x 10 -5 ) dicampur, maka harga pH campuran tersebut adalah...

Jika dua larutan yang masing-masing mengandung 25 ml NaOH 0,2 M dan 25 ml    CH3COOH 0,2 M (Ka CH3COOH = 1 x 10-5) dicampur, maka harga pH campuran tersebut adalah...

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I. Yassa

Master Teacher

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Diketahui: [NaOH] = 0,2 M ; V NaOH = 25 mL [CH 3 COOH] = 0,2 M ; VCH 3 COOH = 25 mL KaCH 3 COOH = Ditanya: pH campuran...? Dijawab: n NaOH = M NaOH x V NaOH = 0,2 M x 25 mL = 5 mmol nCH 3 COOH = MCH 3 COOH x VCH 3 COOH = 0,2 M x 25 mL = 5 mmol maka, mol garam CH 3 COONa adalah 5 mmol

Diketahui: [NaOH] = 0,2 M ; V NaOH = 25 mL 

                 [CH3COOH] = 0,2 M ; V CH3COOH = 25 mL 

                 Ka CH3COOH = 1 space x space 10 to the power of negative 5 end exponent

Ditanya: pH campuran...?

Dijawab: 

n NaOH = M NaOH x V NaOH 

              = 0,2 M x 25 mL = 5 mmol 

n CH3COOH = M CH3COOH x V CH3COOH

                      = 0,2 M x 25 mL = 5 mmol 

maka, mol garam CH3COONa adalah 5 mmol 

begin mathsize 12px style left square bracket G a r a m right square bracket space equals space fraction numerator n over denominator V t o t a l space space end fraction space equals space fraction numerator 5 space m m o l space over denominator 50 space m L space end fraction space equals space 0 comma 1 space M space end style

begin mathsize 12px style left square bracket O H to the power of minus right square bracket space equals space square root of K subscript W over K subscript a space x space left square bracket G a r a m right square bracket end root left square bracket O H to the power of minus right square bracket space equals space square root of fraction numerator 1 space x space 10 to the power of negative 14 end exponent over denominator 1 space x space 10 to the power of negative 5 space end exponent end fraction space x space 0 comma 1 space space end root left square bracket O H to the power of minus right square bracket space equals space square root of 1 space x space 10 to the power of negative 10 end exponent end root left square bracket O H to the power of minus right square bracket space equals space 1 space x space 10 to the power of negative 5 end exponent p O H space equals space minus space log space left square bracket O H to the power of minus right square bracket space p O H space equals space minus space log space 1 space x space 10 to the power of negative 5 end exponent p O H space equals space 5 space minus space log space 1 space p H space equals space 14 space minus space p O H space p H space equals space 14 space minus space left parenthesis 5 space minus space log space 1 right parenthesis space p H space equals space 9 space plus space log space 1 space end style

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