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Jika 100 mL larutan LOH 0,1 M dicampur dengan 75 mL larutan  0,2 M, pH campuran tersebut adalah ...

Pertanyaan

Jika 100 mL larutan LOH 0,1 M dicampur dengan 75 mL larutan begin mathsize 14px style L subscript 2 S O subscript 4 end style 0,2 M, pH campuran tersebut adalah ... 
begin mathsize 14px style left parenthesis K subscript b space LOH space equals space 10 to the power of negative sign 5 end exponent right parenthesis end style 

Pembahasan Soal:

Menentukan nilai mol larutan

begin mathsize 14px style table attributes columnalign right center left columnspacing 0px end attributes row cell n subscript LOH space end cell equals cell space M cross times V end cell row blank equals cell space 0 comma 1 space mol space L to the power of negative sign 1 end exponent cross times 0 comma 1 space L end cell row blank equals cell space 0 comma 01 space mol end cell end table end style 

begin mathsize 14px style table attributes columnalign right center left columnspacing 0px end attributes row cell n subscript L subscript 2 S O subscript 4 end subscript space end cell equals cell space M cross times V end cell row blank equals cell space 0 comma 2 space mol space L to the power of negative sign 1 end exponent cross times 0 comma 075 space L end cell row blank equals cell space 0 comma 015 space mol end cell end table end style 

Menentukan 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 K subscript b cross times fraction numerator n space basa over denominator n space garam end fraction end cell row blank equals cell space 10 to the power of negative sign 5 end exponent cross times fraction numerator 0 comma 01 over denominator 0 comma 015 end fraction end cell row blank equals cell space 6 cross times 10 to the power of negative sign 6 end exponent end cell end table end style 

Menentukan 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 space 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 space log space 6 cross times 10 to the power of negative sign 6 end exponent end cell row blank equals cell space 6 space minus sign space log space 6 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 space minus sign space italic p O H end cell row blank equals cell space 14 space minus sign space left parenthesis 6 minus sign log space 6 right parenthesis end cell row blank equals cell space 8 space plus space log space 6 end cell end table end style 

Jadi, jawaban yang benar pH = 8 + log 6.

Pembahasan terverifikasi oleh Roboguru

Terakhir diupdate 13 Maret 2021

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