Roboguru

Diketahui tabel indikator asam-basa berikut : Larutan 0,05 M ditetesi dengan salah satu indikator yang sesuai, akan menghasilkan warna ... (Ka = 2 x 10-5)

Pertanyaan

Diketahui tabel indikator asam-basa berikut :


Larutan begin mathsize 14px style C H subscript 3 C O O Na end style 0,05 M ditetesi dengan salah satu indikator yang sesuai, akan menghasilkan warna ... (Ka begin mathsize 14px style C H subscript 3 C O O Na end style = 2 x 10-5)

  1. merah

  2. merah mudaspace

  3. kuningspace

  4. biruspace

  5. kuning mudaspace

Pembahasan Soal:

menentukan pH larutan begin mathsize 14px style C H subscript 3 C O O Na end style :

begin mathsize 14px style open square brackets H to the power of plus sign close square brackets equals square root of fraction numerator K italic w over denominator K italic a end fraction cross times open square brackets italic G close square brackets end root open square brackets H to the power of plus sign close square brackets equals square root of fraction numerator 10 to the power of negative sign 14 end exponent over denominator 2 cross times 10 to the power of negative sign 5 end exponent end fraction cross times open square brackets 0 comma 05 close square brackets end root open square brackets H to the power of plus sign close square brackets equals square root of fraction numerator 10 to the power of negative sign 14 end exponent over denominator 2 cross times 10 to the power of negative sign 5 end exponent end fraction cross times open square brackets 5 cross times 10 to the power of negative sign 2 end exponent close square brackets end root open square brackets H to the power of plus sign close square brackets equals square root of fraction numerator 5 cross times 10 to the power of negative sign 16 end exponent over denominator 2 cross times 10 to the power of negative sign 5 end exponent end fraction end root open square brackets H to the power of plus sign close square brackets equals square root of 25 space cross times 10 to the power of negative sign 12 end exponent end root open square brackets H to the power of plus sign close square brackets equals 5 cross times 10 to the power of negative sign 6 end exponent  pH space equals space minus sign log open square brackets H to the power of plus sign close square brackets pH space equals minus sign log space 5 cross times 10 to the power of negative sign 6 end exponent pH space equals 6 minus sign log space 5 pH space equals 6 minus sign 0 comma 7 pH space equals 5 comma 3 end style 

menentukan warna :

pH 5,3 berada direntang trayek pH 4,2 - 6,3 sehingga akan menghasilkan warna diantara merah sampai kuning yaitu kuning muda. 

Jadi, jawaban benar adalah E.

Pembahasan terverifikasi oleh Roboguru

Terakhir diupdate 03 April 2021

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