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Campuran 100 mL larutan NH3​ 0,1 M dan 100 mL larutan NH4​Cl 0,1 M (Kb​ NH3​=1×10−5) akan mempunyai nilai pH ....

Pertanyaan

Campuran 100 mL larutan undefined 0,1 M dan 100 mL larutan undefined 0,1 M (begin mathsize 14px style K subscript b space N H subscript 3 equals 1 cross times 10 to the power of negative sign 5 end exponent end style) akan mempunyai nilai pH ....

  1. undefined 

  2. undefined 

  3. 12 undefined 

  4. begin mathsize 14px style 12 plus log 2 end style 

Y. Rochmawatie

Master Teacher

Jawaban terverifikasi

Jawaban

jawaban yang benar adalah C.

Pembahasan

Diketahui:

begin mathsize 14px style table attributes columnalign right center left columnspacing 0px end attributes row cell V space N H subscript 3 end cell equals cell 100 space mL equals 0 comma 1 space L end cell row cell open square brackets N H subscript 3 close square brackets end cell equals cell 0 comma 1 space M end cell row cell V space N H subscript 4 Cl end cell equals cell 100 space mL equals 0 comma 1 space L end cell row cell open square brackets N H subscript 4 Cl close square brackets end cell equals cell 0 comma 1 space M end cell row cell K subscript b space N H subscript 3 end cell equals cell 1 cross times 10 to the power of negative sign 5 end exponent end cell end table end style

Berikut penyelesaiannya:

  1. Mencari mol begin mathsize 14px style N H subscript 3 end style dan begin mathsize 14px style N H subscript 4 Cl end style

    begin mathsize 14px style table attributes columnalign right center left columnspacing 0px end attributes row cell n space N H subscript 3 end cell equals cell M cross times V end cell row blank equals cell 0 comma 1 space M cross times 0 comma 1 L end cell row blank equals cell 0 comma 01 space mol end cell row cell n space N H subscript 4 Cl end cell equals cell M cross times V end cell row blank equals cell 0 comma 1 space M cross times 0 comma 1 L end cell row blank equals cell 0 comma 01 space mol end cell row blank blank blank end table end style
     
  2. Mencari 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 open square brackets O H to the power of minus sign close square brackets end cell equals cell K subscript b fraction numerator n space N H subscript 3 over denominator n space N H subscript 4 Cl end fraction end cell row blank equals cell 1 cross times 10 to the power of negative sign 5 end exponent fraction numerator 0 comma 01 space mol over denominator 0 comma 01 space mol end fraction end cell row blank equals cell 1 cross times 10 to the power of negative sign 5 end exponent end cell end table end style
     
  3. Mencari pH

    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 cross times 10 to the power of negative sign 5 end exponent end cell row blank equals 5 row pH equals cell 14 minus sign pOH end cell row blank equals cell 14 minus sign 5 end cell row blank equals 9 end table end style

Jadi, jawaban yang benar adalah C.

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NaOH padat yang massanya 4 gram dilarutkan ke dalam 100 mL larutan CH3​COOH 2 M (Ka​ CH3​COOH=10−5). pH larutan yang terjadi adalah .... (Ar​ Na=23, O=16, dan H=1)

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Jawaban terverifikasi

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