Hello, I\'m working on a lab report for potentiometric determination of mized ha

Question

Hello, I'm working on a lab report for potentiometric determination of mized halides, and need help with these questions. I greatly appreciate your help. thanks!!

1. Is silver nitrate a primary standard? Explain your answer in detail.

2.   What is the purpose of using the bisulfate buffer? In detail.

3.   Explain how the difference in the solubility products of AgI and AgCl make this experiment possible. Include in your discussion a narrative of what is happening to the electrode potentials and the I-, Cl-, and the Ag+ ions.

Explanation / Answer

1) AgNO3 is secondary standard, as primary standards are the materials having high purity values under specified conditions which can be used to standardise the volumetric solutions. Primary stadards also used to prepare the solutions which are necessay for the calibration of analytical instruments.

AgNO3 mayundergo thermal decomposition thus changing it's concentraion, as a result we use NaCl to standardise the AgNO3 solutions.

If the silver nitrate is left in sunlight (or any bright light), it breaks down (hydrolyses) to give black/brown silver oxide and nitric acid.

AgNO3 (aq) + H2O (l) --> AgO (s) + HNO3 (aq)

for 2) & 3)

please refer this link ,it will be useful for your procedure also.

http://web.mnstate.edu/marasing/CHEM480/labls/LABS/Potentiometry/Potentiometric%20Halide%20Titration%20with%20Ag.pdf

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