Qualitative analysis- identifying cations and anions

when zinc ion Zn 2+ reacts with NaOH, what is formed

• a white precipitate

• nothing

• green precipitate

• ammonia

when calcium Ca 2+ reacts with NaOH, what is formed

• a white precipitate

• nothing

• a green precipitate

• a reddish brown precipitate

When Fe 2+ ions react with NaOH, what is formed

• a reddish brown precipitate

• nothing

• a white precipitate

• a green precipitate

what precipitate can dissolve in excess NaOH

• Fe2+

• Fe 3+

• Zn 2+

• Al3+

• Pb 2+

when Fe 3+ ions react with NaOH, what is formed

• a reddish brown precipitate

• nothing

• a blue precipitate

• ammonia

what is formed when cations react with solutions like NaOH or NH3 that contain OH - ions

• blue precipitate

• copper

• a metal hydroxide

• nothing

What is formed when Cu 2+ ions react with NaOH

• a blue precipitate

• a green precipitate

• a reddish brown precipitate

• hydrogen

what is qualitative analysis

• a process where scientists guess what cations there is in unknown solution for money

• a process in which chemists predict the cations and anions present in an unknown solution by making standard observations systemetically

• useless

• a guess and check process

What is formed when Zn 2+ ions react with NH3

• nothing

• a white ppt

• a green ppt

• a yellow ppt

Which ion in a unknown solution will form a precipitate that is soluble in excess NH3

• aluminium

• copper

• lead

• zinc