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Sebanyak 1 liter natrium asetat (Ka = 10 -5 ) mempunyai pH = 9, maka massa natrium asetat yang terdapat dalam larutan tersebut adalah…. (Mr senyawa = 82)

Sebanyak 1 liter natrium asetat (Ka = 10-5) mempunyai pH = 9, maka massa natrium asetat yang terdapat dalam larutan tersebut adalah…. (Mr senyawa = 82)

  1. 82 gram

  2. 16,4 gram

  3. 8,2 gram

  4. 1,64 gram

  5. 0,82 gram

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S. Utari

Master Teacher

Mahasiswa/Alumni Universitas Negeri Medan

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Pembahasan

Diketahui: pH = 9 ; Volume = 1 Liter Ka = ; Mr = 82 gram/mol Ditanya: Massa ...? Dijawab: pH = 9 pOH = 14 - pH pOH = 14 - 9 = 5 , maka =

Diketahui: pH = 9 ; Volume begin mathsize 12px style C H subscript 3 C O O N a end style = 1 Liter 

                 Ka = begin mathsize 12px style 1 space x space 10 to the power of negative 5 end exponent end style ; Mr begin mathsize 12px style C H subscript 3 C O O N a end style = 82 gram/mol 

Ditanya: Massa begin mathsize 12px style C H subscript 3 C O O N a end style ...?

Dijawab: 

pH = 9 

pOH = 14 - pH 

pOH = 14 - 9 = 5 , maka begin mathsize 12px style left square bracket O H to the power of minus right square bracket end style = begin mathsize 12px style 1 space x space 10 to the power of negative 5 end exponent 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 fraction numerator K w over denominator K a space end fraction space x space left square bracket G a r a m right square bracket end root left parenthesis 1 space x space 10 to the power of negative 5 end exponent right parenthesis squared space equals space 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 end exponent end fraction space x space left square bracket G a r a m right square bracket space 1 space x space 10 to the power of negative 10 end exponent space equals space 1 space x space 10 to the power of negative 9 end exponent space x space left square bracket G a r a m right square bracket left square bracket G a r a m right square bracket space equals space fraction numerator 1 space x space 10 to the power of negative 10 end exponent space over denominator 1 space x space 10 to the power of negative 9 end exponent end fraction space left square bracket G a r a m right square bracket space equals space 0 comma 1 space M space end style

begin mathsize 12px style s e h i n g g a comma space left square bracket C H subscript 3 C O O N a right square bracket space equals space 0 comma 1 space M space end style

begin mathsize 12px style left square bracket C H subscript 3 C O O N a right square bracket space equals space n over V space 0 comma 1 space equals space fraction numerator n space over denominator 1 space L end fraction n space equals space 0 comma 1 space m o l space n space equals space fraction numerator M a s s a space over denominator M r space C H subscript 3 C O O N a end fraction 0 comma 1 space m o l space equals space fraction numerator M a s s a over denominator 82 space g r a m divided by m o l space end fraction M a s s a space equals space 8 comma 2 space g r a m space end style

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