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Besarnya pH 100 mL larutan  0,1 M setelah ditambah...

Besarnya pH 100 mL larutan begin mathsize 14px style H subscript 2 S O subscript 4 end style 0,1 M setelah ditambah 400 mL air adalah ...

  1. 1,2 space 

  2. 0,6 space 

  3. 0,8 space 

  4. 1,7 space 

  5. 1,4 space 

Jawaban:

Menentukan molaritas larutan setelah diencerkan:

begin mathsize 14px style table attributes columnalign right center left columnspacing 0px end attributes row cell M subscript 1 cross times V subscript 1 end cell equals cell M subscript 2 cross times V subscript 2 end cell row cell 0 comma 1 cross times 100 end cell equals cell M subscript 2 cross times left parenthesis 100 plus 400 right parenthesis end cell row cell 0 comma 1 cross times 100 end cell equals cell M subscript 2 cross times 500 end cell row cell M subscript 2 end cell equals cell 10 over 500 end cell row blank equals cell 0 comma 02 space M end cell end table end style 

Sehingga molaritas begin mathsize 14px style H subscript 2 S O subscript 4 end style setelah penambahan air 0,02 M, maka pH larutan:

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 valensi end cell row blank equals cell 0 comma 02 cross times 2 end cell row blank equals cell 0 comma 04 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 space minus sign space log space 0 comma 04 end cell row blank equals cell space minus sign space log space 4 cross times 10 to the power of negative sign 2 end exponent end cell row blank equals cell 2 space minus sign space log space 4 end cell row blank equals cell 1 comma 4 end cell end table end style 

Jadi, jawaban yang benar adalah E.

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