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Brominasi aseton dengan katalis asam (H+):   H3​CCOCH3​(aq)+Br2​(aq)→H3​CCOCH2​Br(aq)+H++Br−  Merupakan reaksi orde 1 terhadap aseton dan orde 1 terhadap H+. Ketika aseton = 0,01 M dan pH = 2, laju terbentuknya HBr adalah 2,5×10−5 m/s. pH larutan ketika aseton = 10−3 M dan laju berkurangnya Br2​=2,5×10−5m/s adalah ...

Pertanyaan

Brominasi aseton dengan katalis asam (H to the power of plus sign):
 

H subscript 3 C C O C H subscript 3 left parenthesis italic a italic q right parenthesis plus Br subscript 2 left parenthesis italic a italic q right parenthesis yields H subscript 3 C C O C H subscript 2 Br left parenthesis italic a italic q right parenthesis plus H to the power of plus sign and Br to the power of minus sign 


Merupakan reaksi orde 1 terhadap aseton dan orde 1 terhadap H to the power of plus sign. Ketika aseton = 0,01 M dan pH = 2, laju terbentuknya H Br adalah 2 comma 5 cross times 10 to the power of negative sign 5 end exponent space m forward slash s. pH larutan ketika aseton = 10 to the power of negative sign 3 end exponent M dan laju berkurangnya Br subscript 2 equals 2 comma 5 cross times 10 to the power of negative sign 5 end exponent m forward slash s adalah ...space

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B. Rohmawati

Master Teacher

Mahasiswa/Alumni Universitas Negeri Semarang

Jawaban terverifikasi

Pembahasan

Jawaban yang benar adalah opsi A.

Ingat! Laju reaksi adalah bertambahnya produk atau laju berkurangnya reaktan. Diketahui reaksi orde 1 terhadap aseton dan H to the power of plus sign, artinya v double bond k open square brackets aseton close square brackets open square brackets H to the power of plus sign close square brackets.

open square brackets aseton close square brackets equals 10 to the power of negative sign 2 space end exponent M comma space pH equals 2 comma space v equals 2 comma 5 cross times 10 to the power of negative sign 5 end exponent M forward slash s

Ditanya:

open square brackets aseton close square brackets equals 10 to the power of negative sign 3 space end exponent M comma space pH equals.... ? comma space v equals 2 comma 5 cross times 10 to the power of negative sign 5 end exponent M forward slash s

Berdasarkan data yang diketahui pH equals 2 yields open square brackets H to the power of plus sign close square brackets equals 10 to the power of negative sign 2 end exponent

table attributes columnalign right center left columnspacing 0px end attributes row v equals cell k open square brackets aseton close square brackets open square brackets H to the power of plus sign close square brackets end cell row cell 2 comma 5 cross times 10 to the power of negative sign 5 end exponent end cell equals cell k left square bracket 10 to the power of negative sign 2 end exponent right square bracket open square brackets H to the power of plus sign close square brackets end cell row k equals cell fraction numerator 2 comma 5 cross times 10 to the power of negative sign 5 end exponent over denominator 10 to the power of negative sign 4 end exponent end fraction end cell row k equals cell 0 comma 25 space L forward slash mol point s end cell end table

maka pH saat open square brackets aseton close square brackets equals 10 to the power of negative sign 3 end exponent dan v equals 2 comma 5 cross times 10 to the power of negative sign 5 space end exponent M forward slash s adalah

table attributes columnalign right center left columnspacing 0px end attributes row v equals cell k open square brackets aseton close square brackets open square brackets H to the power of plus sign close square brackets end cell row cell 2 comma 5 cross times 10 to the power of negative sign 5 end exponent end cell equals cell 0 comma 25 left square bracket 10 to the power of negative sign 3 end exponent right square bracket open square brackets H to the power of plus sign close square brackets end cell row cell open square brackets H to the power of plus sign close square brackets end cell equals cell fraction numerator 2 comma 5 cross times 10 to the power of negative sign 5 end exponent over denominator 2 comma 5 cross times 10 to the power of negative sign 4 end exponent end fraction end cell row cell open square brackets H to the power of plus sign close square brackets end cell equals cell 0 comma 1 space M end cell end table

Maka 

pH equals minus sign log open square brackets H to the power of plus sign close square brackets pH equals minus sign log space 0 comma 1 pH equals 1 

pH larutan adalah 1.

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