2:47 describe tests for these cations: NH₄⁺ using sodium hydroxide solution and identifying the gas evolved, Cu²⁺, Fe²⁺ and Fe³⁺ using sodium hydroxide solution

Describe tests for the cation NH₄⁺, using sodium hydroxide solution and identifying the ammonia evolved

Describe tests for the cations Cu²⁺, Fe²⁺ and Fe³⁺, using sodium hydroxide solution

First, add sodium hydroxide (NaOH), then observe the colour:

Past paper questions on spec point:

Spec	Q'stion	Ans	MS
2:47	Jan '15 (1), Q 6 c i	Answer	MkS
2:47	Jan '15 (2), Q 4 b ii	Answer	MkS
2:47	Jan '17 (2), Q 4 d	Answer	MkS
2:47	May '14 (2), Q 6 a	Answer	MkS
2:47	May '14 (2), Q 6 b i	Answer	MkS
2:47	May '15 (1R), Q 8 b ii	Answer	MkS
2:47	May '16 (2), Q 2 c	Answer	MkS
2:47	May '17 (1), Q 4 d i	Answer	MkS
2:47	May '17 (1R), Q 12 b i	Answer	MkS
2:47	May '17 (1R), Q 12 b ii	Answer	MkS
2:47	May '17 (1R), Q 6 b	Answer	MkS