What I really need explained is #3. Thank you A chemist makes an ammonia-ammoniu

Question

What I really need explained is #3. Thank you A chemist makes an ammonia-ammonium buffer with a 1:1 base: acid ratio (K_b = 1.76 times 10^-5 for NH_3). The pH of the buffer is measured. Then the chemist adds silver nitrate drop by drop (K_t = 1.7 times 10^7 for the [Ag(NH_3)_2]^+ complex). How will the buffer equilibrium respond the added metal cation? A = It will shift towards the reactant ammonia. B = It will shift towards the product ammonium. C = It will not shift. What happens to the pH of the buffer solution after the metal cation is added? A = It will increase. B = It will decrease. C = It will stay exactly the same. A complexing agent like EDTA is added to the mixture of buffer and silver cation. What happens to the pH after the EDTA is added?

Explanation / Answer

3. As EDTA is good chelating ligand so with the addition of edta it will form a conplex first with silver ion.

During the titration before equivalence point pH is controlled by the excess silver ion and after the equivalence point it is controlled by the excess edta. So more the edta is added to the buffer solution the pH will increases.

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