EXP9 - Objective The objective of this experiment is to...

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Objective: The objective of this experiment is to determine number of grams of NaCl and NaI in a liter of original solution using the potentiometric titration. Theory: Potentiometric methods comprise two main types of analysis: direct potentiometry and potentiometric titration. In the potentiometric titration of Cl - - I - mixture with AgNO 3 precipitation of AgI and AgCl will take place. Because of K sp of AgI is much less than that of AgCl thus it precipitates first. To detect the equivalence point an electrode that responds to a change in Ag + ion concentration during the titration can be used. The potential of this electrode is measured after each successive addition of the titrating agent. A glass electrode can b used as the reference electrode in this experiment. The potential of the electrode when immersed in a pH buffer is quite constant. The leakage problem associated with other electrodes is thus eliminated.
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