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Sebanyak 50 ml larutan  0,005 M dicampur dengan 50...

Sebanyak 50 ml larutan begin mathsize 14px style H subscript 2 S O subscript 4 end style 0,005 M dicampur dengan 50 ml larutan begin mathsize 14px style Na O H end style 0,05 M. Hitunglah pH larutan itu sebelum dan sesudah dicampurkan?

Jawaban:

mmol begin mathsize 14px style H subscript 2 S O subscript 4 end style = 50 mL x 0,005 M = 0,25 mmol
mmol begin mathsize 14px style Na O H end style = 50 mL x 0,05 M = 2,5 mmol
Volume campuran = 50 mL + 50 mL = 100 mL

  • pH begin mathsize 14px style H subscript 2 S O subscript 4 end style sebelum campuran:

    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 valensi cross times open square brackets H subscript 2 S O subscript 4 close square brackets end cell row blank equals cell 2 cross times 0 comma 005 space M end cell row blank equals cell 0 comma 01 space M end cell row pH equals cell negative sign log open square brackets H to the power of plus sign close square brackets end cell row blank equals cell negative sign log space 0 comma 01 end cell row blank equals cell negative sign log space 1 cross times 10 to the power of negative sign 2 end exponent space M end cell row blank equals 2 end table end style 
  • pH campuran

    Tersisa 2,25 mmol NaOH:

    begin mathsize 14px style table attributes columnalign right center left columnspacing 0px end attributes row cell open square brackets Na O H close square brackets end cell equals cell begin inline style fraction numerator 2 comma 25 space mmol over denominator 100 space mL end fraction end style end cell row blank equals cell 0 comma 0225 space M end cell row cell open square brackets O H to the power of minus sign close square brackets end cell equals cell open square brackets Na O H close square brackets equals 0 comma 0225 space M end cell row pOH equals cell negative sign log open square brackets O H to the power of minus sign close square brackets end cell row blank equals cell negative sign log space 0 comma 0225 end cell row blank equals cell negative sign log space 2 comma 25 cross times 10 to the power of negative sign 2 end exponent end cell row blank equals cell 2 minus sign log space 2 comma 25 end cell row pH equals cell 14 minus sign left parenthesis 2 minus sign log space 2 comma 25 right parenthesis end cell row blank equals cell 12 plus log space 2 comma 25 end cell end table end style 

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