Why is S2- Added Slowly for Efficient Precipitation of Ag+ and S2-?

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The discussion centers on the necessity of adding sulfide ions (S2-) slowly to silver ions (Ag+) during experiments to facilitate precipitation. The primary reason for this gradual addition is to allow for careful observation of the reaction conditions under which precipitation occurs. Rapid addition of S2- would hinder the ability to study the reaction effectively, as it could lead to immediate and uncontrolled precipitation, making it difficult to analyze the process.
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Why do we have to add S2- slowly and gradually for precipitation to take place??
 
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I am sorry for a wrong question..
Actually, its as follows:

Why do we add S2- slowly to Ag+ while experimenting ??

My teacher has answered it saying that if S2- is added quickly, we won't be able to study the reaction.
Its added slowly, so that we can note at what conditions does the precipitation occur.
 

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