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Kamis, 03 Maret 2011

konsentrasi larutan

Konsentrasi merupakan cara untuk menyatakan hubungan kuantitatif antara zat terlarut dan pelarut.
Menyatakan konsentrasi larutan ada beberapa macam, di antaranya:

1. FRAKSI MOL
Fraksi mol adalah perbandingan antara jumiah mol suatu komponen dengan jumlah mol seluruh komponen yang terdapat dalam larutan.

Fraksi mol dilambangkan dengan X.

Contoh:
Suatu larutan terdiri dari 3 mol zat terlarut A den 7 mol zat terlarut B. maka:

XA = nA / (nA + nB) = 3 / (3 + 7) = 0.3
XB = nB /(nA + nB) = 7 / (3 + 7) = 0.7
* XA + XB = 1