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Tentukan pH dari   0,1 M jika  ...

Pertanyaan

Tentukan pH dari begin mathsize 14px style X open parentheses O H close parentheses subscript 3 end style  0,1 M jika begin mathsize 14px style K subscript b space equals space 2 comma 5 cross times 10 to the power of negative sign 6 end exponent end style ...

Pembahasan Soal:

Menentukan nilai konsentrasi begin mathsize 14px style O H to the power of minus sign 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 cross times M end root end cell row blank equals cell space square root of 2 comma 5 cross times 10 to the power of negative sign 6 end exponent cross times 0 comma 1 end root end cell row blank equals cell space square root of 25 cross times 10 to the power of negative sign 8 end exponent end root end cell row blank equals cell space 5 cross times 10 to the power of negative sign 4 end exponent end cell end table end style 

Sehingga nilai pH:

begin mathsize 14px style table attributes columnalign right center left columnspacing 0px end attributes row cell italic p O H space end cell equals cell space minus sign log space 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 5 cross times 10 to the power of negative sign 4 end exponent end cell row blank equals cell space 4 minus sign log space 5 end cell end table end style 

begin mathsize 14px style table attributes columnalign right center left columnspacing 0px end attributes row cell italic p H space end cell equals cell space 14 minus sign italic p O H end cell row blank equals cell space 14 minus sign left parenthesis 4 minus sign log space 5 right parenthesis end cell row blank equals cell space 10 plus log space 5 end cell end table end style  

Jadi, jawaban yang benar adalah begin mathsize 14px style bold pH bold space bold equals bold space bold 10 bold plus bold log bold space bold 5 end style.

Pembahasan terverifikasi oleh Roboguru

Terakhir diupdate 13 Maret 2021

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