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Kelvin melakukan percobaan untuk menentukan pH suatu larutan. Kemudian dia mencampurkan larutan asam sulfat 0,2 M sebanyak 100 mL dan larutan NaOH 100 mL 0,2 M. Berapakah pH larutan sebelum di campur dan sesudah dicampur?

Kelvin melakukan percobaan untuk menentukan pH suatu larutan. Kemudian dia mencampurkan larutan asam sulfat 0,2 M sebanyak 100 mL dan larutan NaOH 100 mL 0,2 M. Berapakah pH larutan sebelum di campur dan sesudah dicampur?space 
 

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F. Krisna

Master Teacher

Mahasiswa/Alumni Institut Pertanian Bogor

Jawaban terverifikasi

Jawaban

jawaban yang benar adalah sesuai perhitungan di atas.

jawaban yang benar adalah sesuai perhitungan di atas.

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Pembahasan

Reaksi asam kuat dan basa kuat merupakan reaksi penetralan. Nilai pH asam sulfat sebelum dicampur Nilai pH NaOH sebelum dicampur Nilai pH campuran ​​​​​​​ Jadi, jawaban yang benar adalah sesuai perhitungan di atas.

Reaksi asam kuat dan basa kuat merupakan reaksi penetralan.

  • Nilai pH asam sulfat sebelum dicampur

    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 M cross times valensi end cell row blank equals cell 0 comma 2 space M cross times 2 end cell row blank equals cell 0 comma 4 end cell row blank equals cell 4 cross times 10 to the power of negative sign 1 end exponent end cell row blank blank blank 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 4 cross times 10 to the power of negative sign 1 end exponent end cell row blank equals cell 1 minus sign log space 4 space end cell end table end style 
     
  • Nilai pH NaOH sebelum dicampur

    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 M cross times valensi end cell row blank equals cell 0 comma 2 space M cross times 1 end cell row blank equals cell 2 cross times 10 to the power of negative sign 1 end exponent end cell row blank blank blank 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 2 cross times 10 to the power of negative sign 1 end exponent end cell row blank equals cell 1 minus sign log space 2 end cell row blank blank blank row pH equals cell 14 minus sign pOH end cell row blank equals cell 14 minus sign left parenthesis 1 minus sign log space 2 right parenthesis end cell row blank equals cell 13 plus log space 2 end cell end table end style 
     
  • Nilai pH campuran

    begin mathsize 14px style table attributes columnalign right center left columnspacing 0px end attributes row cell mol space H subscript 2 S O subscript 4 end cell equals cell V cross times M end cell row blank equals cell 100 space mL cross times 0 comma 2 space M end cell row blank equals cell 20 space mmol end cell row blank blank blank row cell mol space Na O H end cell equals cell V cross times M end cell row blank equals cell 100 space mL cross times 0 comma 2 space M end cell row blank equals cell 20 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 H subscript 2 S O subscript 4 close square brackets end cell equals cell fraction numerator mol over denominator V space campuran end fraction end cell row blank equals cell fraction numerator 10 space mmol over denominator 200 space mL end fraction end cell row blank equals cell 0 comma 05 space M end cell row blank blank blank row cell open square brackets H to the power of plus sign close square brackets end cell equals cell M cross times valensi end cell row blank equals cell 0 comma 05 space M cross times 2 end cell row blank equals cell 0 comma 1 end cell row blank equals cell 10 to the power of negative sign 1 end exponent end cell row blank blank blank row pH equals cell negative sign log left square bracket H plus right square bracket end cell row blank equals cell negative sign log space 10 to the power of negative sign 1 end exponent end cell row blank equals 1 end table end style 
    ​​​​​​​

Jadi, jawaban yang benar adalah sesuai perhitungan di atas.

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