Qualitative Analysis of Cations

What is the most appropriate way to describe this observation?

• blue precipitate formed in blue solution

• blue cloudy emulsion

• blue muddy water

• blue precipitate

Tags

NGSS.MS-PS1-2

What is the physical state of precipitates?

• Solid

• Liquid

• Gaseous

• Aqueous

What is the most appropriate way to describe this observation?

• white precipitate formed in blue solution

• blue cloudy emulsion

• white cloudy emulsion

• blue precipitate

Tags

NGSS.MS-PS1-2

When excess sodium hydroxide was added to an unknown sample, this was observed. What is the precipitate formed?

• copper(II) hydroxide

• zinc hydroxide

• iron(III) hydroxide

• iron(II) hydroxide

Tags

NGSS.HS-PS1-2

When excess sodium hydroxide was added to an unknown sample, this was observed. What is the precipitate formed?

• copper(II) hydroxide

• zinc hydroxide

• iron(III) hydroxide

• iron(II) hydroxide

When excess sodium hydroxide was added to an unknown sample, this was observed. What is the precipitate formed?

• copper(II) hydroxide

• zinc hydroxide

• iron(III) hydroxide

• iron(II) hydroxide

What is the first stage in the systematic analysis of cations?

• Preliminary tests for cations

• Identification tests of cations

• Selective dissolution of cations

• Selective precipitation of cations

How are cations separated into 5 groups in the systematic analysis?

• Through the successive addition of selective precipitating reagents

• Through selective dissolution processes

• Through dry heating tests

• Through different identification tests

What is the behaviour of cations towards common test reagents in qualitative analysis?

• Differs from one cation to another

• Remains the same for all cations

• Depends on the pH of the solution

• Is not relevant in the analysis

What is the purpose of the Borax Bead Test in the preliminary tests for cations?

• To separate cations into 5 groups

• To confirm the presence of each cation

• To provide some information about the ions present in the mixture

• To identify the cationic radicals