A student mixes two solutions together. One is believed to be HI, the other is believed to be HNO3. A precipitate forms. Believing the results may be in error the student repeats the process twice in separate wells. After repeating the trial there was no observed precipitate. What is the most likely reason for the initial precipitate result?

In test for halide ions, silver nitrate [tex]AgNO_{3}[/tex] is used to test for the presence of soluble halide ions. The presence of [tex]AgNO_{3}[/tex] in the reaction mixture (possibly the HNO3) gave the semblance of test for chlorides, allowing for formation of precipitation in the initial experiment.

This error could have been caused by handling of reagents and used laboratory apparatus during the initial reaction.

Cricetus Cricetus · Answer 2 · 2021-11-24T15:24:44+01:00

The most probable cause would be the presence of Silver nitrate impurities. A further explanation is below.

Silver nitrate has been utilized throughout the halide ion analysis just to detect the existence of accessible halides. The occurrence of something in the reaction mixture resembled a screening for chlorides, permitting for precipitate development in the experimental procedure.
This mistake might've been produced by reagent management as well as the usage of scientific equipment throughout the first response.

Thus the response above is appropriate.

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