Roboguru

Tentukanlah  dalam larutan yang nilai pH-nya :

Tentukanlah begin mathsize 14px style open square brackets H to the power of plus sign close square brackets space dan space open square brackets O H to the power of minus sign close square brackets end style dalam larutan yang nilai pH-nya :

begin mathsize 14px style 2 plus log space 5 end style 

Jawaban:

Penentuan begin mathsize 14px style open square brackets H to the power of plus sign close square brackets space dan space open square brackets O H to the power of minus sign close square brackets end style berdasarkan hubungannya terhadap pH dan begin mathsize 14px style K subscript italic w end style (pH = begin mathsize 14px style 2 plus log space 5 end stylebegin mathsize 14px style K subscript italic w equals 1 cross times 10 to the power of negative sign 14 end exponent end style).

  • Penentuan begin mathsize 14px style open square brackets H to the power of plus sign close square brackets end style.

begin mathsize 14px style table attributes columnalign right center left columnspacing 0px end attributes row pH equals cell 2 plus log space 5 end cell row pH equals cell 2 plus 0 comma 7 end cell row pH equals cell 2 comma 7 end cell row blank blank blank row cell open square brackets H to the power of plus sign close square brackets end cell equals cell 10 to the power of negative sign pH end exponent end cell row cell open square brackets H to the power of plus sign close square brackets end cell equals cell 10 to the power of negative sign 2 comma 7 end exponent end cell row cell open square brackets H to the power of plus sign close square brackets end cell equals cell 2 cross times 10 to the power of negative sign 3 end exponent end cell end table end style  

  • Penentuan begin mathsize 14px style open square brackets O H to the power of minus sign close square brackets end style.

begin mathsize 14px style table attributes columnalign right center left columnspacing 0px end attributes row cell K subscript italic w end cell equals cell open square brackets O H to the power of minus sign close square brackets cross times open square brackets H to the power of plus sign close square brackets end cell row cell open square brackets O H to the power of minus sign close square brackets end cell equals cell fraction numerator K subscript italic w over denominator open square brackets H to the power of plus sign close square brackets end fraction end cell row cell open square brackets O H to the power of minus sign close square brackets end cell equals cell fraction numerator 1 cross times 10 to the power of negative sign 14 end exponent over denominator 2 cross times 10 to the power of negative sign 3 end exponent end fraction end cell row cell open square brackets O H to the power of minus sign close square brackets end cell equals cell 5 cross times 10 to the power of negative sign 12 end exponent end cell end table end style 


Jadi, nilai begin mathsize 14px style open square brackets H to the power of plus sign close square brackets end style dan begin mathsize 14px style open square brackets O H to the power of minus sign close square brackets end style berturut-turut adalah undefined dan begin mathsize 14px style 5 cross times 10 to the power of negative sign 12 end exponent end style.

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