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Sebanyak 25 mL etilamina 0,1 M ( C 2 ​ H 5 ​ N H 2 ​ , K b ​ = 5 , 6 × 1 0 − 4 ) dititrasi dengan HCl 0,1 M. Pernyataan yang benar untuk larutan hasil titrasi setelah penambahan 10 mL HCl adalah...

Sebanyak 25 mL etilamina 0,1 M  dititrasi dengan HCl 0,1 M. Pernyataan yang benar untuk larutan hasil titrasi setelah penambahan 10 mL HCl adalah...

  1. begin mathsize 12px style open square brackets H subscript 3 O to the power of plus sign close square brackets less than 10 to the power of negative sign 7 end exponent end style

  2. terbentuk larutan buffer yang bersifat asam

  3. begin mathsize 12px style open square brackets C subscript 2 H subscript 5 N H subscript 2 close square brackets greater than open square brackets C subscript 2 H subscript 5 N H subscript 3 to the power of italic plus close square brackets end style

  4. begin mathsize 12px style open square brackets O H to the power of minus sign close square brackets equals open square brackets C subscript 2 H subscript 5 N H subscript 3 to the power of plus close square brackets end style

  5. jumlah ion begin mathsize 12px style C italic l to the power of minus sign end style < 1,0 mmol

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A. Tiara

Master Teacher

Mahasiswa/Alumni Universitas Negeri Semarang

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Pembahasan

Reaksi yang terjadi adalah: Sisa basa lemah, sehingga larutan yang terbentuk adalah buffer basa (B salah) Jumlah ion = jumlah ion = 1 mmol (E salah) merupakan asam, sehingga:

begin mathsize 12px style italic M italic o italic l space C subscript 2 H subscript 5 N H subscript 2 equals italic M cross times V equals 0 comma 1 space italic M cross times 25 space italic m italic L equals 2 comma 5 space italic m italic m italic o italic l  italic M italic o italic l space H C italic l equals italic M cross times V equals 0 comma 1 space M cross times 10 space mL equals 1 space mmol end style

Reaksi yang terjadi adalah:

begin mathsize 12px style space space space space space space space space space space space space space space space space space space space space space space space C subscript 2 H subscript 5 N H subscript 2 space plus space H Cl space space space space space space space space rightwards arrow space space space space C subscript 2 H subscript 5 N H subscript 3 Cl  Mula bond mula space space 2 comma 5 space mmol space space space space 1 space mmol  Reaksi space space space space space space space space space space space 1 space mmol space space space space space space space space 1 space mmol space space space space space space space space space space space 1 space mmol  Sisa space space space space space space space space space space space space space space space space 1 comma 5 space mmol space space space space 0 space mmol space space space space space space space space space space space 1 space mmol end style

Sisa basa lemah, sehingga larutan yang terbentuk adalah buffer basa (B salah)

 

begin mathsize 12px style open square brackets O H to the power of minus sign close square brackets equals K italic b cross times fraction numerator italic m italic o italic l space italic b italic a italic s italic a space italic l italic e italic m italic a italic h over denominator italic m italic o italic l space italic g italic a italic r italic a italic m end fraction  open square brackets O H to the power of minus sign close square brackets equals 5 comma 6 cross times 10 to the power of negative sign 4 end exponent cross times fraction numerator 1 comma 5 space mmol over denominator 1 space mmol end fraction  open square brackets O H to the power of minus sign close square brackets equals 8 comma 4 cross times 10 to the power of negative sign 4 end exponent    open square brackets C subscript 2 H subscript 5 N H subscript 3 to the power of plus close square brackets equals fraction numerator 1 space mmol over denominator 35 space mL end fraction equals 0 comma 029 space M space space open parentheses italic D bold space bold salah close parentheses end style

 

Jumlah ion undefined = jumlah ion begin mathsize 12px style C subscript 2 H subscript 5 N H subscript 3 C italic l end style = 1 mmol (E salah)

 

begin mathsize 12px style C subscript 2 H subscript 5 N H subscript 3 C italic l end style merupakan asam, sehingga:

begin mathsize 12px style C subscript 2 H subscript 5 N H subscript 3 to the power of plus plus H subscript 2 O rightwards arrow over leftwards arrow subscript C 2 H subscript 5 N H subscript 2 and H subscript 3 O to the power of plus sign  Di space mana space open square brackets H subscript 3 O to the power of plus sign close square brackets equals open square brackets H to the power of plus sign close square brackets    open square brackets H to the power of plus sign close square brackets equals square root of fraction numerator Kw cross times open square brackets C subscript 2 H subscript 5 N H subscript 3 to the power of plus close square brackets over denominator Kb end fraction 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 cross times open square brackets 0 comma 005 close square brackets over denominator 5 comma 6 cross times 10 to the power of negative sign 4 end exponent end fraction end root  open square brackets H to the power of plus sign close square brackets equals square root of 50 cross times 10 to the power of negative sign 14 end exponent end root  open square brackets H to the power of plus sign close square brackets equals 7 comma 01 cross times 10 to the power of negative sign 7 end exponent space M    Sehingga space open square brackets H to the power of plus sign close square brackets greater than 10 to the power of negative sign 7 end exponent space space space open parentheses italic A bold space bold salah close parentheses    open square brackets C subscript 2 H subscript 5 N H subscript 3 to the power of plus close square brackets equals fraction numerator mol space sisa over denominator V space total end fraction equals fraction numerator 1 comma 5 space mmol over denominator 35 space mL end fraction equals 0 comma 043 space M  Sehingga colon  open square brackets C subscript 2 H subscript 5 N H subscript 2 close square brackets greater than open square brackets C subscript 2 H subscript 5 N H subscript 3 to the power of plus close square brackets space space space open parentheses C bold space bold benar close parentheses end style

 

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Sebanyak 25 mL etilamina 0,1 M (C 2 H 5 NH 2 , K b = 5,6 x 10 –4 ) dititrasi dengan HCl 0,1 M. Pernyataan yang benar untuk larutan hasil titrasi setelah penambahan 10 mL HCI adalah ....

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