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Tentukan pH dari 0,02 M .

Tentukan pH dari begin mathsize 14px style N H subscript 3 end style 0,02 M begin mathsize 14px style left parenthesis Kb equals 1 comma 8 x 10 to the power of negative sign 5 end exponent right parenthesis end style .

Jawaban:

begin mathsize 14px style N H subscript 3 end style merupakan basa lemah. Basa lemah adalah senyawa yang hanya sedikit terurai saat dilarutkan ke dalam air. Berikut adalah rumus penentuan pH basa lemah:

begin mathsize 14px style table attributes columnalign right center left columnspacing 0px end attributes row cell open square brackets O H to the power of minus sign close square brackets end cell equals cell square root of Kb space x space M end root end cell row pOH equals cell negative sign log space open square brackets O H to the power of minus sign close square brackets end cell row pH equals cell 14 minus sign pOH end cell end table end style 

  • Kb= tetapan ionisasi basa
  • M=molaritas basa

Apabila  begin mathsize 14px style N H subscript 3 end style 0,02 M begin mathsize 14px style left parenthesis Kb equals 1 comma 8 x 10 to the power of negative sign 5 end exponent right parenthesis end style maka:

begin mathsize 14px style table attributes columnalign right center left columnspacing 0px end attributes row cell open square brackets O H to the power of minus sign close square brackets end cell equals cell square root of left parenthesis 1 comma 8 x 10 to the power of negative sign 5 end exponent end root right parenthesis x 0 comma 02 space end cell row blank equals cell square root of 36 x 10 to the power of negative sign 8 end exponent end root end cell row blank equals cell 9 x 10 to the power of negative sign 4 end exponent end cell row pOH equals cell negative sign log space left parenthesis 9 x 10 to the power of negative sign 4 end exponent right parenthesis end cell row blank equals cell 4 minus sign log space 9 end cell row pH equals cell 14 minus sign left parenthesis 4 minus sign log space 9 right parenthesis end cell row blank equals cell 10 plus log space 9 end cell end table end style

Jadi, pH dari begin mathsize 14px style N H subscript 3 end style 0,02 M adalah 10+log 9.

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