Ammonium ions can be identified in a solution by adding dilute sodium hydroxide solution and gently heating. If ammonium ions are present, they will be converted to ammonia gas. Ammonia has a characteristic choking smell. It also turns damp red litmus paper or damp universal indicator paper blue.
Respuesta
True
False
Pregunta 7
Pregunta
When NaOH is added to Fe2+, what colour is the precipitate?
Respuesta
Orange-brown
green
blue
Pregunta 8
Pregunta
When NaOH is added to Fe3+, what colour is the precipitate?
Respuesta
Green
Orange-brown
Blue
Pregunta 9
Pregunta
When NaOH is added to Cu2+, the precipitate is green
Respuesta
True
False
Pregunta 10
Pregunta
When dilute NaOH is added to Zn2+, a white precipitate forms