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Fenol ( C 6 ​ H 5 ​ O H ) merupakan asam lemah dengan K a = 1 , 0 × 1 0 − 10 . Konsentrasi fenol dalam larutan yang dibuat dengan melarutkan 0,02 mol C 6 ​ H 5 ​ ON A ke dalam 500 mL air adalah...

Fenol  merupakan asam lemah dengan . Konsentrasi fenol dalam larutan yang dibuat dengan melarutkan 0,02 mol  ke dalam 500 mL air adalah...

  1. begin mathsize 12px style 2 comma 5 cross times 10 to the power of negative sign 8 end exponent space italic M end style

  2. begin mathsize 12px style 1 comma 0 cross times 10 to the power of negative sign 5 end exponent space italic M end style

  3. begin mathsize 12px style 2 comma 0 cross times 10 to the power of negative sign 3 end exponent space italic M end style

  4. begin mathsize 12px style 1 comma 2 cross times 10 to the power of negative sign 2 end exponent space italic M end style

  5. begin mathsize 12px style 2 comma 4 cross times 10 to the power of negative sign 1 end exponent space italic M end style

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A. Tiara

Master Teacher

Mahasiswa/Alumni Universitas Negeri Semarang

Jawaban terverifikasi

Jawaban

[C 6 H 5 OH] = 2 x 10 –3 M

[C6H5OH] = 2 x 10–3 M

Pembahasan

merupakan garam yang bersifat basa, sehingga kita kan mencari OH – [ ] = Ionisasi garam: C 6 H 5 O – terhidrolisis karena merupakan ion lemah: Sehingga: Sehingga: Karena koefisien OH – dan C 6 H 5 OH (fenol) sama, maka konsentrasi fenol juga sama Sehingga [C 6 H 5 OH] = 2 x 10 –3 M

begin mathsize 12px style C subscript 6 H subscript 5 O N italic A end style merupakan garam yang bersifat basa, sehingga kita kan mencari OH

[begin mathsize 12px style C subscript 6 H subscript 5 O N italic A end style] = begin mathsize 12px style fraction numerator italic m italic o italic l over denominator italic v italic o italic l italic u italic m italic e end fraction equals fraction numerator 0 comma 02 space italic m italic o italic l over denominator 0 comma 5 end fraction equals 0 comma 04 space italic M end style

Ionisasi garam:

begin mathsize 12px style C subscript 6 H subscript 5 O N italic a yields C subscript 6 H subscript 5 O to the power of minus sign and Na to the power of plus sign  0 comma 04 space M space space space space space space space space space space 0 comma 04 space M end style

C6H5Oterhidrolisis karena merupakan ion lemah:

begin mathsize 12px style C subscript 6 H subscript 5 O to the power of minus sign and H subscript 2 O yields and is yielded by yields and is yielded by C subscript 6 H subscript 5 O H and O H to the power of minus sign end style

Sehingga:

begin mathsize 12px style open square brackets O H to the power of minus sign close square brackets equals square root of fraction numerator Kw cross times open square brackets C subscript 4 H subscript 5 O to the power of minus sign close square brackets over denominator Ka end fraction end root  open square brackets O H to the power of minus sign close square brackets equals square root of fraction numerator 10 to the power of negative sign 14 end exponent cross times open square brackets 0 comma 04 close square brackets over denominator 10 to the power of negative sign 10 end exponent end fraction end root  open square brackets O H to the power of minus sign close square brackets equals square root of 4 cross times 10 to the power of negative sign 6 end exponent end root  open square brackets O H to the power of minus sign close square brackets equals 2 cross times 10 to the power of negative sign 3 end exponent space M end style

Sehingga:

begin mathsize 12px style C subscript 6 H subscript 5 O to the power of minus sign and H subscript 2 O yields C subscript 6 H subscript 5 O H space space space space space space plus space space O H to the power of minus sign  space space space space space space space space space space space space space space space space space space space space space space space space space space space space space space space space space 2 cross times 10 to the power of negative sign 3 end exponent space M space space almost equal to space 2 cross times 10 to the power of negative sign 3 end exponent space M end style

Karena koefisien OHdan C6H5OH (fenol) sama, maka konsentrasi fenol juga sama

Sehingga [C6H5OH] = 2 x 10–3 M

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