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100 mL 0,2 M direaksikan dengan 25 mL NaOH 0,2 M. Jika tentukan pH campuran tersebut!

100 mL begin mathsize 14px style C H subscript 3 C O O H end style 0,2 M direaksikan dengan 25 mL NaOH 0,2 M. Jika begin mathsize 14px style K subscript a italic space C H subscript 3 C O O H equals 10 to the power of negative sign 5 end exponent end style tentukan pH campuran tersebut!

Jawaban:

Menentukan nilai mol larutan:

begin mathsize 14px style table attributes columnalign right center left columnspacing 0px end attributes row cell n subscript C H subscript 3 C O O H end subscript end cell equals cell M cross times V end cell row blank equals cell 0 comma 2 cross times 100 end cell row blank equals cell 20 space mmol end cell row blank equals cell 0 comma 02 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 NaOH end cell equals cell M cross times V end cell row blank equals cell 0 comma 2 cross times 25 end cell row blank equals cell 5 space mmol end cell row blank equals cell 0 comma 005 space mol end cell end table end style 

Reaksi yang terjadi:

 

Menentukan pH campuran:

 

begin mathsize 14px style table attributes columnalign right center left columnspacing 0px end attributes row cell open square brackets H to the power of plus sign close square brackets end cell equals cell K subscript a cross times n subscript C H subscript 3 C O O H end subscript over n subscript C H subscript 3 C O O to the power of minus sign end subscript end cell row blank equals cell 10 to the power of negative sign 5 end exponent cross times fraction numerator 0 comma 015 over denominator 0 comma 005 end fraction end cell row blank equals cell 3 cross times 10 to the power of negative sign 5 end exponent 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 end cell equals cell negative sign space log space open square brackets H to the power of plus sign close square brackets end cell row blank equals cell negative sign space log space 3 cross times 10 to the power of negative sign 5 end exponent end cell row blank equals cell 5 space minus sign space log space 3 end cell end table end style 

Jadi, pH campuran yang benar adalah 5 - log 3.

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