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<!--td {border: 1px solid #ccc;}br {mso-data-placement:same-cell;}--> 15 mL larutan amonia dititrasi dengan larutan asam klorida 0,1 M. Perubahan warna terjadi saat volume asam klorida habis 17 ml.

15 mL larutan amonia dititrasi dengan larutan asam klorida 0,1 M. Perubahan warna terjadi saat volume asam klorida habis 17 ml. Tentukan konsentrasi amonia dan buatlah kurva titrasinya! (kE= 1,8 x 10-5)
 

Jawaban:

Titrasi basa lemah oleh asam kuat

begin mathsize 14px style space space space space V subscript BL space x space M subscript BL space end subscript equals space V subscript AK space end subscript space x space M subscript AK 15 space mL space x space M subscript BL space end subscript equals space 17 space mL space x space 0 comma 1 space M space space space space space space space space space space space space space space M subscript BL space equals space fraction numerator 17 space mL space x space 0 comma 1 space M over denominator 15 space mL end fraction space space space space space space space space space space space space space space M subscript BL space equals space 0 comma 1133 space M end style 

Kurva titrasi

  1. pH basa lemah
    begin mathsize 14px style open square brackets O H to the power of minus sign close square brackets space equals square root of K subscript b space x space M subscript b end root open square brackets O H to the power of minus sign close square brackets space equals square root of 1 comma 8 space x space 10 to the power of negative sign 5 end exponent space x space 0 comma 1133 end root open square brackets O H to the power of minus sign close square brackets space equals 1 comma 428 space x space 10 to the power of negative sign 3 end exponent pOH space equals space minus sign space log space open square brackets O H to the power of minus sign close square brackets pOH space equals space minus sign space log space 1 comma 428 space x space 10 to the power of negative sign 3 end exponent pOH space equals space 3 space minus sign space log space 1 comma 428 pOH space equals space 2 comma 845 pH space equals space 14 space minus sign space pOH pH space equals space 14 space minus sign space 2 comma 845 pH space equals space 11 comma 155 end style 
     
  2. pH asam kuat

    begin mathsize 14px style open square brackets H to the power of plus sign close square brackets space equals space M subscript a space x space a open square brackets H to the power of plus sign close square brackets space equals space 0 comma 1 space M space x space 1  pH space equals space minus sign space log space open square brackets H to the power of plus sign close square brackets pH space equals space minus sign space log space 1 space x space 10 to the power of negative sign 1 end exponent pH space equals space 1 end style 
     
  3. Titik akhir titrasi dapat dihitung dengan:

    begin mathsize 14px style open square brackets H to the power of plus sign close square brackets space equals space square root of K subscript w over K subscript b x space M subscript BL end root open square brackets H to the power of plus sign close square brackets space equals space square root of fraction numerator 1 space x space 10 to the power of negative sign 14 end exponent over denominator 1 comma 8 space x space 10 to the power of negative sign 5 end exponent end fraction x space 0 comma 1133 end root open square brackets H to the power of plus sign close square brackets space equals space square root of 6 comma 29 space x space 10 to the power of negative sign 11 end exponent end root open square brackets H to the power of plus sign close square brackets space equals space 7 comma 9 space x 10 to the power of negative sign 6 end exponent pH space equals space minus sign space log space open square brackets H to the power of plus sign close square brackets pH space equals space minus sign space log space 7 comma 9 space x 10 to the power of negative sign 6 end exponent pH space equals space 6 space minus sign space log space 7 comma 9 pH space equals space 5 comma 1 space end style 

    Titik akhir titrasi ada di pH 5,1 

 Maka gambar kurvanya adalah:

 

Jadi, konsentrasi basa adalah 0,1133 M dan kurva titrasi basa lemah dan asam kuat adalah turun dari pH tinggi ke pH rendah dengan titik ekivalen 5,1.

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