Interactive Video: qualitative Analysis

What did you observe when sodium hydroxide and aqueous ammonia were added to Zn2+ , Al3+ and Pb2+ dropwise then i n excess?

How is the observation of the sodium hydroxide with Ca2+ different than that of Zn2+, Al3+, and Pb2+?

Are you enjoying the video lesson?

• Yes

• No

What similarity and difference do you notice when testing for Cu2+, Fe2+ and Fe3+ with NaOH?

What do you observe when aqueous ammonia is added in excess to Cu2+ ions?

• blue precipitate

• blue solution

• Blue precipitate dissolves to form dark blue solution.

• blue precipitate dissolves