Testing For Positive Ions - part 2

The video tutorial explains how to test for the presence of transition metal ions and the ammonium ion. It covers the use of flame tests for Group 1, Group 2, and Copper 2+ ions, and the addition of sodium hydroxide to identify transition metal ions by the color of the precipitate formed. Specific reactions of copper, iron, and zinc ions are discussed, including the oxidation of iron hydroxide. The tutorial also covers testing non-transition metal ions like calcium, aluminum, and magnesium, and methods to detect ammonium ions using ammonia formation and litmus paper.

Which test is used to identify Group 1 and Group 2 metal ions?

• Litmus test

• Precipitation test

• Flame test

• Titration test

What color precipitate does copper(II) hydroxide form?

• Green

• Blue

• White

• Reddish brown

Why does iron(II) hydroxide change color upon standing?

• It oxidizes to iron(III) hydroxide

• It reacts with water

• It decomposes into iron and oxygen

• It absorbs carbon dioxide

What flame color is observed for calcium ions?

• Brick red

• Green

• No color

• Blue

How can the presence of ammonium ions be confirmed?

• By observing a color change in litmus paper

• By dissolving in sodium hydroxide

• By forming a blue precipitate

• By producing a green flame