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Larutan NH 4 ​ Cl 0,1 Mterhidrolisis 10%. pH larutan tersebut adalah ....

Larutan 0,1 M terhidrolisis 10%. pH larutan tersebut adalah ....

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Y. Rochmawatie

Master Teacher

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Diketahui: Konsentrasi = 0,1 M = 10% Ditanya: pH larutan = ....? Jawab: Ion dapat terhidrolisis oleh molekul air: Menghitung nilai (tetapan hidrolisis). Menghitung pH larutan Jadi, jawaban yang benar adalah A.

Diketahui:

Konsentrasi begin mathsize 14px style N H subscript 4 Cl space end style= 0,1 M

begin mathsize 14px style alpha end style begin mathsize 14px style N H subscript 4 Cl space end style= 10%

Ditanya:

pH larutan = ....?

Jawab:

Ion begin mathsize 14px style N H subscript 4 to the power of plus end style dapat terhidrolisis oleh molekul air:

begin mathsize 14px style N H subscript 4 Cl yields N H subscript 4 to the power of plus plus Cl to the power of minus sign N H subscript 4 to the power of plus plus H subscript 2 O equilibrium H subscript 3 O to the power of plus sign and N H subscript 3 end style 

  • Menghitung nilai begin mathsize 14px style K subscript h end style (tetapan hidrolisis).

begin mathsize 14px style table attributes columnalign right center left columnspacing 0px end attributes row alpha equals cell square root of K subscript h over M end root end cell row cell 0 comma 1 end cell equals cell square root of fraction numerator K subscript h over denominator 0 comma 1 end fraction end root end cell row cell open parentheses 0 comma 1 close parentheses to the power of 2 to the power of blank end exponent end cell equals cell open parentheses square root of fraction numerator K subscript h over denominator 0 comma 1 end fraction end root close parentheses squared end cell row cell 10 to the power of negative sign 2 end exponent end cell equals cell fraction numerator K subscript h over denominator 0 comma 1 end fraction end cell row cell K subscript h end cell equals cell 10 to the power of negative sign 3 end exponent end cell row blank blank blank end table end style 

  • Menghitung pH larutan

begin mathsize 14px style table attributes columnalign right center left columnspacing 0px end attributes row cell open square brackets H to the power of plus sign close square brackets end cell equals cell square root of K subscript h cross times open square brackets garam close square brackets end root end cell row cell open square brackets H to the power of plus sign close square brackets end cell equals cell square root of 10 to the power of negative sign 3 end exponent cross times 0 comma 1 end root end cell row cell open square brackets H to the power of plus sign close square brackets end cell equals cell 10 to the power of negative sign 2 end exponent end cell row pH equals cell negative sign log open square brackets H to the power of plus sign close square brackets end cell row pH equals cell negative sign log open parentheses 10 to the power of negative sign 2 end exponent close parentheses end cell row pH equals 2 row blank blank blank end table end style 


Jadi, jawaban yang benar adalah A.undefined 
 

 

 

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