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Pertanyaan

Jika diketahui K a CH 3 COOH = 10 -5 , maka pH larutan CH 3 COONa 0,004 M adalah .....

Jika diketahui Ka CH3COOH = 10-5, maka pH larutan CH3COONa 0,004 M adalah .....

  1. 7 + log 2

  2. 6 + log 5

  3. 9 + log 2

  4. 7 + log 5

  5. 8 + log 2

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S. Hidayati

Master Teacher

Mahasiswa/Alumni Universitas Indonesia

Jawaban terverifikasi

Pembahasan

Reaksi hidrolisis garam : CH 3 COONa → CH 3 COO - + Na + 4 x 10 -3 M 4 x 10 -3 M

Reaksi hidrolisis garam :

CH3COONa  →       CH3COO-             + Na+

4 x 10-3 M                4 x 10-3 M

left square bracket O H to the power of minus right square bracket equals square root of fraction numerator K w space x space left square bracket C H subscript 3 C O O N a right square bracket space over denominator K a end fraction end root left square bracket O H to the power of minus right square bracket equals square root of fraction numerator 10 to the power of negative 14 end exponent space x space left parenthesis 4 space x space 10 to the power of negative 3 end exponent right parenthesis space over denominator 10 to the power of negative 5 end exponent end fraction end root left square bracket O H to the power of minus right square bracket equals square root of 4 space x space 10 to the power of negative 12 end exponent end root left square bracket O H to the power of minus right square bracket space equals 2 space x space 10 to the power of negative 6 end exponent  p O H equals space minus space log space left square bracket O H to the power of minus right square bracket space p O H equals space minus space log space 2 x space 10 to the power of negative 6 end exponent space p O H space equals space 6 space – space log space 2  p H space equals space 14 space – space p O H p H equals space 14 space – space left parenthesis 6 space – space log space 2 right parenthesis space p H equals space 8 space plus space log space 2

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Jika lima liter natrium asetat ( K a = 10 -5 ) memiliki nilai pH sebesar 9, maka massa natrium asetat yang terdapat dalam larutan tersebut adalah ..... ( M r CH 3 COONa = 82 gram/mol).

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