An unidentified salt was determined to be either KNO3, KNO2 or K2CO3. Upon the addition of hydrochloric acid, a brown gas was observed. The unidentified salt is:
Question
An unidentified salt was determined to be either KNO3, KNO2 or K2CO3. Upon the addition of hydrochloric acid, a brown gas was observed. The unidentified salt is:
Solution
The unidentified salt is KNO2. Here's why:
When you add hydrochloric acid (HCl) to the salts, different reactions occur.
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KNO3 + HCl -> KCl + HNO3. This reaction does not produce a brown gas.
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KNO2 + 2HCl -> 2KCl + 2NO + H2O. This reaction produces Nitric Oxide (NO), which is a brown gas.
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K2CO3 + 2HCl -> 2KCl + H2O + CO2. This reaction produces Carbon Dioxide (CO2), which is a colorless gas.
Therefore, the unidentified salt that produces a brown gas when reacted with hydrochloric acid must be KNO2.
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