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Hitung pH larutan campuran berikut : 100 mL NaOH 0 , 1 M + 100 mL NH 3 ​ 0 , 1 M ( α = 0 , 1 )

Hitung pH larutan campuran berikut :


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pH campuran tersebut adalah 12 + log 5,5.

pH campuran tersebut adalah 12 + log 5,5.

Pembahasan

Pembahasan
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Untuk mencari pH campuran, digunakan rumus berikut: Maka dicari terlebih dahulu konsentrasi masing-masing. Larutan Larutan Kemudian dicari pH seperti biasa Jadi, pH campuran tersebut adalah 12 + log 5,5.

Untuk mencari pH campuran, digunakan rumus berikut:

undefined 

Maka dicari terlebih dahulu konsentrasi undefined masing-masing.

Larutan undefined 

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 b cross times M subscript b end cell row blank equals cell 1 cross times 0 comma 1 end cell row blank equals cell 10 to the power of negative sign 1 end exponent end cell end table end style 

Larutan begin mathsize 14px style N H subscript 3 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 end cell equals cell alpha cross times M subscript b end cell row blank equals cell 0 comma 1 cross times 0 comma 1 end cell row blank equals cell 10 to the power of negative sign 2 end exponent end cell end table end style 

begin mathsize 14px style table attributes columnalign right center left columnspacing 0px end attributes row cell left parenthesis open square brackets O H to the power of minus sign close square brackets subscript 1 cross times V subscript 1 right parenthesis plus left parenthesis open square brackets O H to the power of minus sign close square brackets subscript 2 cross times V subscript 2 right parenthesis end cell equals cell open square brackets O H to the power of minus sign close square brackets subscript camp cross times V subscript camp end cell row cell open square brackets O H to the power of minus sign close square brackets subscript camp end cell equals cell fraction numerator left parenthesis open square brackets O H to the power of minus sign close square brackets subscript 1 cross times V subscript 1 right parenthesis plus left parenthesis open square brackets O H to the power of minus sign close square brackets subscript 2 cross times V subscript 2 right parenthesis over denominator V subscript camp end fraction end cell row blank equals cell fraction numerator left parenthesis 10 to the power of negative sign 1 end exponent cross times 100 right parenthesis space plus space left parenthesis 10 to the power of negative sign 2 end exponent cross times 100 right parenthesis over denominator 200 end fraction end cell row blank equals cell fraction numerator 10 plus 1 over denominator 200 end fraction end cell row blank equals cell 0 comma 055 end cell end table end style 

Kemudian dicari pH seperti biasa

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 5 comma 5 cross times 10 to the power of negative sign 2 end exponent end cell row blank equals cell 2 minus sign log space 5 comma 5 end cell row cell pH and pOH end cell equals 14 row pH equals cell 14 minus sign left parenthesis 2 minus sign log space 5 comma 5 right parenthesis end cell row pH equals cell 12 plus log space 5 comma 5 end cell end table end style 

Jadi, pH campuran tersebut adalah 12 + log 5,5.

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