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Pertanyaan

Dalam suatu eksperimen dilakukan reaksi ion amonium dan ion nitrit dalam air membentuk gas nitrogen sebagai berikut.


N H subscript 4 to the power of plus left parenthesis italic a italic q right parenthesis plus N O subscript 2 to the power of – left parenthesis italic a italic q right parenthesis yields N subscript 2 open parentheses italic g close parentheses and 2 H subscript 2 O open parentheses italic l close parentheses 


Data eksperimen dengan kemolaran diubah-ubah diperoleh data sebagai berikut.


 


Dari data eksperimen tersebut tentukan orde reaksi dan persamaan laju reaksi.

M. Juliana

Master Teacher

Mahasiswa/Alumni Universitas Negeri Medan

Jawaban terverifikasi

Pembahasan

Orde reaksi merupakan jumlah pangkat konsentrasi dari zat yang bereaksi (reaktan). Orde reaksi dapat berupa bilangan bulat positif kecil, namun dalam beberapa hal dapat berupa bilangan pecahan atau nol. Orde reaksi dapat dicari dengan cara membandingkan laju reaksi dari masing-masing eksperimen sebagai berikut.


V double bond k open square brackets N H subscript 4 to the power of plus close square brackets to the power of x open square brackets N O subscript 2 to the power of minus sign close square brackets to the power of y


Perbandingan laju reaksi 3 dan 4.


table attributes columnalign right center left columnspacing 0px end attributes row cell v subscript 1 over v subscript 2 end cell equals cell fraction numerator k open square brackets N H subscript 4 to the power of plus close square brackets to the power of x open square brackets N O subscript 2 to the power of minus sign close square brackets to the power of y over denominator k open square brackets N H subscript 4 to the power of plus close square brackets to the power of x open square brackets N O subscript 2 to the power of minus sign close square brackets to the power of y end fraction end cell row cell fraction numerator 21 comma 5 cross times 10 to the power of negative sign 7 end exponent over denominator 32 comma 3 cross times 10 to the power of negative sign 7 end exponent end fraction end cell equals cell fraction numerator k open square brackets 0 comma 2 close square brackets to the power of x open square brackets 0 comma 04 close square brackets to the power of y over denominator k open square brackets 0 comma 2 close square brackets to the power of x open square brackets 0 comma 06 close square brackets to the power of y end fraction end cell row cell 2 over 3 end cell equals cell open square brackets 2 over 3 close square brackets to the power of y end cell row y equals 1 end table


Perbandingan laju reaksi 5 dan 6


table attributes columnalign right center left columnspacing 0px end attributes row cell v subscript 1 over v subscript 2 end cell equals cell fraction numerator k open square brackets N H subscript 4 to the power of plus close square brackets to the power of x open square brackets N O subscript 2 to the power of minus sign close square brackets to the power of y over denominator k open square brackets N H subscript 4 to the power of plus close square brackets to the power of x open square brackets N O subscript 2 to the power of minus sign close square brackets to the power of y end fraction end cell row cell fraction numerator 10 comma 8 cross times 10 to the power of negative sign 7 end exponent over denominator 21 comma 6 cross times 10 to the power of negative sign 7 end exponent end fraction end cell equals cell fraction numerator k open square brackets 0 comma 0202 close square brackets to the power of x open square brackets 0 comma 2 close square brackets to the power of y over denominator k open square brackets 0 comma 0204 close square brackets to the power of x open square brackets 0 comma 2 close square brackets to the power of y end fraction end cell row cell 1 half end cell equals cell open square brackets 1 half close square brackets to the power of x end cell row x equals 1 end table 


Dari perhitungan di atas, dihasilkan orde reaksi x equals 1 dan y equals 1. Dengan demikian, persamaan laju reaksinya adalah table attributes columnalign right center left columnspacing 0px end attributes row blank blank v end table table attributes columnalign right center left columnspacing 0px end attributes row blank equals blank end table table attributes columnalign right center left columnspacing 0px end attributes row blank blank k end table table attributes columnalign right center left columnspacing 0px end attributes row blank blank cell open square brackets N H subscript 4 to the power of plus close square brackets end cell end table table attributes columnalign right center left columnspacing 0px end attributes row blank blank cell open square brackets N O subscript 2 to the power of minus sign close square brackets end cell end table.

Jadi, berdasarkan data eksperimen maka orde reaksi x equals 1 comma y equals 1 dan persamaan laju reaksinya adalah table attributes columnalign right center left columnspacing 0px end attributes row blank blank v end table table attributes columnalign right center left columnspacing 0px end attributes row blank equals blank end table table attributes columnalign right center left columnspacing 0px end attributes row blank blank k end table table attributes columnalign right center left columnspacing 0px end attributes row blank blank cell open square brackets N H subscript 4 to the power of plus close square brackets end cell end table table attributes columnalign right center left columnspacing 0px end attributes row blank blank cell open square brackets N O subscript 2 to the power of minus sign close square brackets end cell end table.
 

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