Roboguru

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

Pertanyaan

Jika 100 mL larutan begin mathsize 14px style italic L O H end style 0,1 M dicampur dengan 75 mL larutan begin mathsize 14px style italic L subscript 2 S O subscript 4 end style 0,2 M, pH campuran tersebut adalah ....begin mathsize 14px style space end style 

(begin mathsize 14px style K subscript b space italic L O H equals 10 to the power of negative sign 5 end exponent end style)begin mathsize 14px style space end style 

Pembahasan Soal:

Campuran antara basa lemah dan garamnya akan membentuk larutan penyangga basa.

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 end cell equals cell K subscript b cross times fraction numerator left square bracket italic L O H right square bracket over denominator left square bracket italic L subscript 2 S O subscript 4 right square bracket end fraction end cell row blank equals cell 10 to the power of negative sign 5 end exponent cross times fraction numerator left parenthesis begin display style bevelled fraction numerator 100 space mL cross times 0 comma 1 space M over denominator 100 space plus 75 space mL end fraction end style right parenthesis over denominator left parenthesis begin display style bevelled fraction numerator 75 space mL cross times 0 comma 2 space M over denominator 100 plus 75 space mL end fraction end style right parenthesis end fraction end cell row blank equals cell 10 to the power of negative sign 5 end exponent cross times 10 over 15 end cell row blank equals cell 6 comma 67 cross times 10 to the power of negative sign 6 end exponent end cell end table end style 

begin mathsize 14px style table attributes columnalign right center left columnspacing 0px end attributes row pOH equals cell negative sign log space open square brackets O H to the power of minus sign close square brackets end cell row blank equals cell negative sign log space left parenthesis 6 comma 67 cross times 10 to the power of negative sign 6 end exponent right parenthesis end cell row blank equals cell 6 minus sign log space 6 comma 67 end cell end table end style 

begin mathsize 14px style table attributes columnalign right center left columnspacing 0px end attributes row pH equals cell 14 minus sign pOH end cell row blank equals cell 14 minus sign left parenthesis 6 minus sign log space 6 comma 67 right parenthesis end cell row blank equals cell 8 plus log space 6 comma 67 end cell end table end style 


Jadi, pH campuran tersebut adalah 8 + log 6,67.

Pembahasan terverifikasi oleh Roboguru

Terakhir diupdate 15 Maret 2021

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