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Mengapa Laju reaksi didefinisikan sebagai perubahan molar thd waktu, bukan perubahan mol saja?
by Agus Suroso - Selasa, 5 April 2005, 08:19
 

Assalamu 'alaikum (man ittaba'a huda) warahmatullahi wa barakatuh.

Ada yang mengganjal di pikiran saya tentang definisi laju reaksi. Mudah-mudahan teman-teman bersedia membantu saya.

Bahwa dibalik pendefinisian sesuatu, pastilah memiliki hikmah/manfaat yang bisa diambil.

Pertanyaan saya adalah, mengapa laju reaksi didefinisikan sebagai laju perubahan konsentrasi zat terhadap waktu? Kenapa tidak perubahan mol zat terhadap waktu saja? Kira-kira apakah yang akan terjadi seandainya laju reaksi didefinisikan sebagai laju perubahan mol zat terhadap waktu?

Saya agak kurang paham, bagaimana seandainya pada suatu reaksi terjadi perubahan volume zat-zat yang terlibat dalam reaksi tersebut. Bukankah hal ini akan menyebabkan parameter pengukuran  besar molar/konsentrasi (yaitu volum) akan berubah?

Jazakumullah (man ittaba'a huda) khairan atas perhatian dan jawaban teman-teman.

Wassalamu 'alaikum (man ittaba'a huda).

Agus Suroso (10204041)

agussuroso102@students.itb.ac.id, www.agussuroso.tk

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Re: Mengapa Laju reaksi didefinisikan sebagai perubahan molar thd waktu, bukan perubahan mol saja?
by Kiki adikurnia - Senin, 18 April 2005, 01:03
 

Laju reaksi menyatakan berkurangnya konsentrasi pereaksi atau bertambahnya hasil reaksi per satuan waktu..Anda tidak menyatakan konsentrasi yang dimaksud itu dalam satuan apa.. Dalam kimia, dikenal kemolaran (M), Formal (F), kenormalan (N) dll..Dan kemolaran merupakan satuan konsentrasi yang sering digunakan.

mol menyatakan banyaknya atom atau molekul..Ketika reaksi kimia terjadi dan berlangsung, terjadi tumbukan antar atom dan atau molekul. Bagaimana tumbukan bisa terjadi jika tidak terdapat media yang menampung pereaksi-pereaksi, yang memungkinkan tumbukan tersebut terjadi? kebanyakan media yang digunakan adalah zat cair. Sehingga diperlukan koreksi terhadap volume zat cair yang digunakan. Sehingga dalam persamaan matematisnya digunakan konsentrasi dalam molar.

Dibandingkan dengan zat cair, volume zat padat biasanya diabaikan. Mengapa? pada umumnya penambahan zat padat kedalam zat cair, hanya akan menambah volume yang sangat kecil dibandingkan terhadap volume awal zat cair yang digunakan..dV ~ O.. 

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Re: Mengapa Laju reaksi didefinisikan sebagai perubahan molar thd waktu, bukan perubahan mol saja?
by agus paul - Rabu, 4 Mei 2005, 03:11
  Hebat..........
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Re: Mengapa Laju reaksi didefinisikan sebagai perubahan molar thd waktu, bukan perubahan mol saja?
by tata suharta - Sabtu, 25 Maret 2006, 12:06
  tambahan :
Kalo menurut saya perubahan mol terhadap waktu tidak bisa dipakai untuk penentuan laju reaksi.
Dalam suatu reaksi, meskipun jumlah mol zat-zat yang terlibat sama, tetapi bila konsentrasinya berbeda, maka laju reaksinya akan berbeda pula. Misalnya kita mau mereaksikan zat A dan zat B dengan jumlah mol yang sama tetapi dibuat dalam dua kondisi yang berbeda. Kondisi pertama konsentrasi zat A dan zat B dibuat encer, kondisi kedua konsentasi zat A dan zat B dibuat pekat, maka laju reaksi kedua kondisi tersebut akan berbeda. (ia nggak sih?)
Ada banyak faktor yang menentukan laju reaksi :
1. konsentrasi
2. suhu
3. tekanan
4. katalis
5. ada yang  mau nambahin lagi?
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