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The above equation describes the reaction process between nitric acid (HNO3) and lead (Pb), which generates nitrogen dioxide (NO2), water (H2O), and lead(II) nitrate (Pb(NO3)2).
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Reaction conditions: This reaction occurs easily under standard temperature and pressure conditions. Sometimes, it is necessary to increase the temperature to speed up the reaction.
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Reaction process: In the reaction, lead reacts with nitric acid to produce nitrogen dioxide, water, and lead(II) nitrate. As a metal, lead gives off electrons and reacts with the nitrate ions in nitric acid to form lead(II) nitrate. In this process, nitric acid is also reduced to nitrogen dioxide.
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Phenomenon occurrence: When the reaction takes place, you will see brown gas (nitrogen dioxide) rising from the solution. The solution will also turn white due to the formation of lead(II) nitrate.