. How is the completeness of separation of the benzoic acid from sodium chloride known with the addition of AgNO3 solution? the experiment was about crystallization. this question is based on the test for the completeness of the separation: i dissolved a small amount of the crystals which is formed from benzoic acid, in 1 ml hot distilled water in a test tube and added 1 drop of 1% AgNO3.

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If any NaCl was present, you would have immediately seen the formation of AgCl which is an insoluble compound.  The solubility of this compound is so low that even a small amount of AgNO3 would result in precipitation if any chloride ions were present. 

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