Kamis, 02 Juni 2011

THEORY OF CONDUCTOMETRIC AND POTENTIOMETRIC TITRATION

in  this pdf file you will find these contents:

CONTENTS
1. TITRATION                                             3
2. CONDUCTOMETRIC TITRATION       5
3. POTENTIOMETRY                               14
 

            3.1 pH  measurements           14
            3.2 Potentiometric titration     16
 
 TITRATION
Titration is process of chemical analysis in which the quantity, amount or concentration, of some constituent of a sample, known as an analyte, is determined by adding to the measured sample an exactly known quantity of another substance with which the desired constituent reacts in a definite, known proportion. The process is usually carried out by gradually adding  a standard solution (i.e., a solution of known concentration) of titrating reagent, or  titrant, from a   burette, essentially a long, graduated measuring tube with a stopcock and a delivery  tip at its lower end. Titrations may be carried out by hand from the burette or automatically.

CONDUCTOMETRIC TITRATION
In this experiment we shall be concerned with electrical conduction through aqueous solutions. Although water is itself a  very poor conductor of electricity, the presence of ionic species in solution increases the conductance considerably. The conductance of such electrolytic solutions depends on the concentration of the ions and also on the nature of the ions present ( through their charges and mobilities ). Conductance behaviour as a function of concentration is different for strong and weak electrolytes.

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