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Suatu garam NaOCN0,3 M memiliki derajat hidrolisis sebesar 0,001. Nilai pH garam tersebut adalah ....

Suatu garam NaOCN 0,3 M memiliki derajat hidrolisis sebesar 0,001. Nilai pH garam tersebut adalah ....

  1. 3 - log 4

  2. 4 - log 3

  3. 4 + log 3
     

  4. 10 - log 3
     

  5. 10 + log 3 

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J. Siregar

Master Teacher

Mahasiswa/Alumni Universitas Negeri Medan

Jawaban terverifikasi

Pembahasan

Diketahui : Derajat ionisasi(α) = 1 x 10 -3 M garam = 3 x 10 -1 Garam NaOCN merupakan garam yang berasal dari basa kuat NaOH dan asam lemah HOCN, sehingga:

Diketahui :

Derajat ionisasi (α) = 1 x 10-3

M garam = 3 x 10-1

alpha equals square root of fraction numerator K h over denominator open square brackets g a r a m close square brackets end fraction end root alpha squared equals fraction numerator K h over denominator open square brackets g a r a m close square brackets end fraction K h equals alpha squared open square brackets g a r a m close square brackets K h equals open parentheses 1 cross times 10 to the power of negative 3 end exponent close parentheses squared cross times open parentheses 3 cross times 10 to the power of negative 1 end exponent close parentheses K h equals 3 cross times 10 to the power of negative 7 end exponent

Garam NaOCN merupakan garam yang berasal dari basa kuat NaOH dan asam lemah HOCN, sehingga:

open square brackets OH to the power of minus close square brackets equals square root of fraction numerator K h over denominator K a end fraction open square brackets g a r a m close square brackets end root open square brackets OH to the power of minus close square brackets equals square root of K subscript h open square brackets g a r a m close square brackets end root open square brackets OH to the power of minus close square brackets equals square root of 3 cross times 10 to the power of negative 7 end exponent cross times 3 cross times 10 to the power of negative 1 end exponent end root open square brackets OH to the power of minus close square brackets equals square root of 9 cross times 10 to the power of negative 8 end exponent end root open square brackets OH to the power of minus close square brackets equals 3 cross times 10 to the power of negative 4 end exponent space straight M  pOH equals negative log space open square brackets OH to the power of minus close square brackets pOH equals negative log space open parentheses 3 cross times 10 to the power of negative 4 end exponent space close parentheses pOH equals 4 space minus space log space 3  pH equals 14 minus pOH pH equals 14 minus open parentheses 4 space minus space log space 3 close parentheses pH equals 10 plus log space 3

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Larutan CH 3 ​ COOH ( K a ​ = 1 × 1 0 − 5 ) 0,116 M sebanyak 50 mL dititrasi dengan larutan NaOH 0,145 M. Saat titik ekuivalen tercapai, pH larutan sebesar ....

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