Hitunglah pH campuran antara 50 mL larutan NaOH 0,1 M dengan 100 mL larutan HCl 0,2 M!

Pertanyaan

Hitunglah pH campuran antara 50 mL larutan NaOH 0,1 M dengan 100 mL larutan HCl 0,2 M!undefined 

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Y. Rochmawatie

Master Teacher

Jawaban terverifikasi

Jawaban

pH campuran dari NaOH dan HCl tersebut adalah 1.

Pembahasan

Nilai mol masing-masing senyawa:

begin mathsize 14px style table attributes columnalign right center left columnspacing 0px end attributes row cell n space Na O H end cell equals cell space M cross times V end cell row cell n space Na O H end cell equals cell space 0 comma 1 space M cross times 0 comma 05 space L end cell row cell n space Na O H end cell equals cell space 0 comma 005 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 space H Cl end cell equals cell M cross times V end cell row cell n space H Cl end cell equals cell 0 comma 2 space M cross times 0 comma 1 space L end cell row cell n space H Cl end cell equals cell 0 comma 02 space mol end cell end table end style 

Sehingga nilai mol saat setelah reaksi:

 

Tersisa mol HCl yang merupakan asam kuat dengan reaksi: begin mathsize 14px style H Cl space rightwards arrow space H to the power of plus sign space plus Cl to the power of minus sign end style 

valensi asam = 1

 begin mathsize 14px style table attributes columnalign right center left columnspacing 0px end attributes row cell open square brackets H Cl close square brackets end cell equals cell n subscript HCl over V subscript left parenthesis Na O H and H Cl right parenthesis end subscript end cell row cell open square brackets H Cl close square brackets end cell equals cell fraction numerator 0 comma 015 space mol over denominator left parenthesis 0 comma 05 space plus 0 comma 1 right parenthesis space L end fraction end cell row cell open square brackets H Cl close square brackets end cell equals cell fraction numerator 0 comma 015 space mol over denominator 0 comma 15 space L end fraction end cell row cell open square brackets H Cl close square brackets end cell equals cell 0 comma 1 space M end cell end table end style 

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 M cross times Val end cell row cell open square brackets H to the power of plus sign close square brackets end cell equals cell 0 comma 1 cross times 1 end cell row cell open square brackets H to the power of plus sign close square brackets end cell equals cell 0 comma 1 end cell end table end style 

Sehingga nilai pH campuran:

begin mathsize 14px style table attributes columnalign right center left columnspacing 0px end attributes row pH equals cell negative sign log space open square brackets H to the power of plus sign close square brackets end cell row pH equals cell negative sign log space open parentheses 0 comma 1 close parentheses end cell row pH equals 1 end table end style 

Jadi, pH campuran dari NaOH dan HCl tersebut adalah 1.

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