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Direaksikan 50 mL  dengan 25 mL  yang mempunyai pH 1. . pH hasil reaksi adalah...

Pertanyaan

Direaksikan 50 mL begin mathsize 14px style N H subscript 3 space 0 comma 1 space M end style dengan 25 mL begin mathsize 14px style H Cl end style yang mempunyai pH 1. begin mathsize 14px style Kb space N H subscript 3 equals space 1 comma 8 cross times 10 to the power of negative sign 5 end exponent end style. pH hasil reaksi adalah...

  1. begin mathsize 14px style 5 minus sign log space 1 comma 8 end style

  2. begin mathsize 14px style 5 plus log space 1 comma 8 end style

  3. begin mathsize 14px style 5 comma 5 minus sign log space 1 comma 3 end style

  4. begin mathsize 14px style 8 comma 5 plus log space 1 comma 3 end style

  5. begin mathsize 14px style 9 plus log space 1 comma 8 end style

Pembahasan Soal:

begin mathsize 14px style table attributes columnalign right center left columnspacing 0px end attributes row cell mmol space N H subscript 3 end cell equals cell M cross times V end cell row blank equals cell 0 comma 1 cross times 50 end cell row blank equals cell 5 space mmol end cell end table end style


begin mathsize 14px style table attributes columnalign right center left columnspacing 0px end attributes row cell pH space H Cl end cell equals 1 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 1 end exponent space M end cell end table end style


begin mathsize 14px style table attributes columnalign right center left columnspacing 0px end attributes row cell mmol space H Cl end cell equals cell M cross times V end cell row blank equals cell 0 comma 1 cross times 25 end cell row blank equals cell 2 comma 5 space mmol end cell end table end style




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 Ka cross times begin inline style b over g end style end cell row blank equals cell 1 comma 8 cross times 10 to the power of negative sign 5 end exponent cross times begin inline style fraction numerator 2 comma 5 space mmol over denominator 2 comma 5 space mmol end fraction end style end cell row blank equals cell 1 comma 8 cross times 10 to the power of negative sign 5 end exponent space M end cell end table end style

 

begin mathsize 14px style table attributes columnalign right center left columnspacing 0px end attributes 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 blank equals cell negative sign log space 1 comma 8 cross times 10 to the power of negative sign 5 end exponent end cell row blank equals cell 5 minus sign log space 1 comma 8 end cell end table end style


begin mathsize 14px style table attributes columnalign right center left columnspacing 0px end attributes row pH equals cell 14 minus sign pOH end cell row blank equals cell 14 minus sign left parenthesis 5 minus sign log space 1 comma 8 right parenthesis end cell row blank equals cell 9 plus log space 1 comma 8 end cell end table end style


Jadi, jawaban yang benar adalah E.

Pembahasan terverifikasi oleh Roboguru

Terakhir diupdate 02 April 2021

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