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Larutan Error converting from MathML to accessible text. memiliki pH sebesar ....

  1. begin mathsize 14px style 2 minus sign log space 5 end style 

  2. begin mathsize 14px style 5 minus sign log space 4 end style 

  3. begin mathsize 14px style 5 minus sign log space 1 comma 6 end style 

  4. begin mathsize 14px style 5 minus sign log space 2 end style 

  5. begin mathsize 14px style 5 plus log space 2 end style 

F. Tri

Master Teacher

Jawaban terverifikasi

Jawaban

jawaban yang tepat adalah B.

Pembahasan

Reaksi ionisasi dan hidrolisis garam:
 

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

Garam diketahui bersifat asam sehingga persamaan matematis hidrolisisnya menjadi seperti berikut.


begin mathsize 14px style table attributes columnalign right center left columnspacing 0px end attributes row blank blank cell open square brackets H to the power of plus sign close square brackets end cell end table table attributes columnalign right center left columnspacing 0px end attributes row blank equals blank end table table attributes columnalign right center left columnspacing 0px end attributes row blank blank cell square root of K subscript w over K subscript b cross times open square brackets N H subscript 4 to the power of plus close square brackets end root end cell end table end style


Ingat bahwa tetapan kesetimbangan air begin mathsize 14px style open parentheses K subscript w close parentheses end style selalu bernilai begin mathsize 14px style 10 to the power of negative sign 14 end exponent end style. Dengan demikian, pH larutan begin mathsize 14px style N H subscript 4 N O subscript 3 end style adalah sebagai berikut.


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 10 to the power of negative sign 14 end exponent over 10 to the power of negative sign 5 end exponent cross times open square brackets 16 cross times 10 to the power of negative sign 1 end exponent 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 16 cross times 10 to the power of negative sign 10 end exponent end root end cell row cell open square brackets H to the power of plus sign close square brackets end cell equals cell 4 cross times 10 to the power of negative sign 5 end exponent end cell row blank blank blank row pH equals cell negative sign log space open square brackets H to the power of plus sign close square brackets end cell row pH equals cell negative sign log space open square brackets 4 cross times 10 to the power of negative sign 5 end exponent close square brackets end cell row pH equals cell 5 minus sign log space 4 end cell end table end style


Jadi, jawaban yang tepat adalah B.

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