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Hitung pH larutan berikut: 1. 0,04 M, diketahui harga

Hitung pH larutan berikut:

1. begin mathsize 14px style H N O subscript 2 end style 0,04 M, diketahui harga begin mathsize 14px style alpha space equals space 1 percent sign end style 

  1. ... undefined 

  2. ... undefined 

Jawaban:

Diketahui: Konsentrasi mula-mula begin mathsize 14px style H N O subscript 2 end style= 0,004 M
                 Persen ionisasi begin mathsize 14px style open parentheses alpha close parentheses end style= 1%
Ditanya: pH undefined?

begin mathsize 14px style H N O subscript 2 open parentheses italic a italic q close parentheses equilibrium H to the power of plus sign open parentheses italic a italic q close parentheses plus N O subscript 2 to the power of minus sign open parentheses italic a italic q close parentheses end style 

begin mathsize 14px style table attributes columnalign right center left columnspacing 0px end attributes row alpha equals cell fraction numerator open square brackets H to the power of plus sign close square brackets over denominator open square brackets HA close square brackets subscript 0 end fraction cross times 100 percent sign end cell row cell 1 percent sign end cell equals cell fraction numerator open square brackets H to the power of plus sign close square brackets over denominator open square brackets HA close square brackets subscript 0 end fraction cross times 100 percent sign end cell row cell fraction numerator 1 percent sign over denominator 100 percent sign end fraction end cell equals cell fraction numerator open square brackets H to the power of plus sign close square brackets over denominator open square brackets HA close square brackets subscript 0 end fraction end cell row cell open square brackets H to the power of plus sign close square brackets end cell equals cell 0 comma 01 cross times open square brackets HA close square brackets subscript 0 end cell row cell open square brackets H to the power of plus sign close square brackets end cell equals cell 0 comma 01 cross times 0 comma 04 space M end cell row blank equals cell 4 cross times 10 to the power of negative sign 4 end exponent space M end cell row blank blank blank end table end style 

 

Jika undefined, maka pH adalah: 

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 blank equals cell negative sign space log space 4 cross times 10 to the power of negative sign 4 end exponent end cell row blank equals cell 4 minus sign log space 4 end cell row blank equals cell 3 comma 4 end cell end table end style 

 

Jadi, dapat disimpulkan bahwa pH larutan tersebut sebesar 3,4.

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