Chemistry
When an ammonium salt is warmed with sodium hydroxide solution, a gas is evolved. State three ways in which you could identify this gas.
Ammonia
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Answer
When an ammonium salt is warmed with sodium hydroxide solution, ammonia gas is evolved.
NH4Cl + NaOH ⟶ NaCl + H2O + NH3
Three ways in which ammonia gas can be identified is:
- It has a sharp characteristic odour.
- It turns:
- moist red litmus blue,
- moist turmeric paper brown,
- phenolphthalein solution pink.
- It gives dense white fumes with conc. hydrochloric acid.
NH3 + HCl ⟶ NH4Cl
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