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pH larutan aluminium nitrat 0,1 M yang terhidrolisis 1 % sebesar ...

pH larutan aluminium nitrat 0,1 M yang terhidrolisis 1 % sebesar ...

  1. 11

  2. 10

  3. 7

  4. 4

  5. 3

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Y. Rochmawatie

Master Teacher

Jawaban terverifikasi

Jawaban

jawaban yang benar adalah E.

jawaban yang benar adalah E.

Pembahasan

Pembahasan
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Aluminium nitrat atau akan terionisasi menjadi ion dan ion . Ion akan mengalami hidrolisis sedangkan ion tidak terhidrolisis. mengalami hidrolisis parsial di dalam air. Pertama-tama, menentukan nilai Kedua, menentukan nilai pH larutan Jadi, jawaban yang benar adalah E.

Aluminium nitrat atau begin mathsize 14px style Al open parentheses N O subscript 3 close parentheses subscript 3 end style akan terionisasi menjadi ion begin mathsize 14px style Al to the power of 3 plus sign end style dan ion begin mathsize 14px style N O subscript 3 to the power of minus sign end style. Ion undefined akan mengalami hidrolisis sedangkan ion undefined tidak terhidrolisis. undefined mengalami hidrolisis parsial di dalam air.

begin mathsize 14px style space space space space space space Al open parentheses N O subscript 3 close parentheses subscript 3 yields Al to the power of 3 plus sign plus 3 N O subscript 3 to the power of minus sign Al to the power of 3 plus sign and 3 H subscript 2 O equilibrium Al open parentheses O H close parentheses subscript 3 plus 3 H to the power of plus sign end style 

begin mathsize 14px style open square brackets Al to the power of 3 plus sign close square brackets equals open square brackets Al open parentheses N O subscript 3 close parentheses subscript 3 close square brackets equals 0 comma 1 space M end style  

Pertama-tama, menentukan nilai begin mathsize 14px style K subscript b space Al open parentheses O H close parentheses subscript 3 end style

begin mathsize 14px style space space space space space space space straight alpha equals 1 percent sign equals 0 comma 01 space space space space space space space straight alpha equals square root of fraction numerator straight K subscript straight h over denominator open square brackets Al to the power of 3 plus end exponent close square brackets end fraction end root space space space space space space space straight alpha equals square root of fraction numerator straight K subscript straight w over denominator straight K subscript straight b space cross times space open square brackets Al to the power of 3 plus end exponent close square brackets end fraction end root 10 to the power of negative 2 end exponent equals square root of fraction numerator 10 to the power of negative 14 end exponent over denominator straight K subscript straight b space cross times space 10 to the power of negative 1 end exponent end fraction end root 10 to the power of negative 4 end exponent equals fraction numerator 10 to the power of negative 14 end exponent over denominator straight K subscript straight b space cross times space 10 to the power of negative 1 end exponent end fraction space space space space straight K subscript straight b equals 10 to the power of negative 9 end exponent end style 

Kedua, menentukan nilai pH larutan 

begin mathsize 14px style left square bracket straight H to the power of plus right square bracket equals square root of straight K subscript straight w over straight K subscript straight b space cross times space open square brackets Al to the power of 3 plus end exponent close square brackets end root left square bracket straight H to the power of plus right square bracket equals square root of 10 to the power of negative 14 end exponent over 10 to the power of negative 9 end exponent space cross times space 10 to the power of negative 1 end exponent end root left square bracket straight H to the power of plus right square bracket equals square root of 10 to the power of negative 6 end exponent end root left square bracket straight H to the power of plus right square bracket equals 10 to the power of negative 3 end exponent space space pH equals negative log space left square bracket straight H to the power of plus right square bracket space space pH equals negative log space 10 to the power of negative 3 end exponent space space pH equals 3 end style  

Jadi, jawaban yang benar adalah E.

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