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Tentukan pH larutan amonia 0,5 M! Jika diketahui !

Tentukan pH larutan amonia 0,5 M! Jika diketahui begin mathsize 14px style K subscript b italic space N H subscript 3 equals 1 comma 8 cross times 10 to the power of negative sign 5 end exponent end style!undefined 

  1. ...undefined 

  2. ...undefined 

Jawaban:

Larutan amonia merupakan basa lemah yang memiliki nilai begin mathsize 14px style open square brackets O H to the power of minus sign close square brackets end style:

begin mathsize 14px style table attributes columnalign right center left columnspacing 0px end attributes row cell open square brackets O H to the power of minus sign close square brackets space end cell equals cell space square root of K subscript b space Mb end root end cell row blank equals cell space square root of 1 comma 8 cross times 10 to the power of negative sign 5 end exponent cross times 0 comma 5 end root end cell row blank equals cell 3 cross times 10 to the power of negative sign 3 end exponent end cell end table end style 

Sehingga nilai pH larutan amonia:

begin mathsize 14px style table attributes columnalign right center left columnspacing 0px end attributes row cell pOH space end cell equals cell space minus sign log open square brackets O H to the power of minus sign close square brackets end cell row blank equals cell space minus sign log space left parenthesis 3 cross times 10 to the power of negative sign 3 end exponent right parenthesis end cell row blank equals cell 3 minus sign log 3 end cell end table end style 

begin mathsize 14px style table attributes columnalign right center left columnspacing 0px end attributes row cell pH space end cell equals cell space 14 space minus sign space pOH end cell row blank equals cell space 14 space minus sign space left parenthesis 3 minus sign log 3 right parenthesis end cell row blank equals cell space 11 plus log 3 end cell end table end style 

Jadi, jawaban yang benar adalah begin mathsize 14px style 11 plus log 3 end style.

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