Identification of Cations

Which chemical can be used to test for cations? (you may choose more than 1 answer)

• Ammonium hydroxide

• Ammonium nitrate

• Sodium chloride

• Sodium hydroxide

Ammonium hydroxide is also known as ____________. (You may choose more than 1 answer.)

• aqueous ammonia

• ammonia solution

• NH₃ (aq)

• NH₄OH

Which option correctly describes this observation?

• clear blue solution

• blue precipitate

• blue water

• blue solution with blue precipitate

Tags

NGSS.MS-PS1-2

Which option correctly describes this observation?

• blue milky water

• blue cloudy emulsion

• blue precipitate formed in blue solution

• blue precipitate

Tags

NGSS.MS-PS1-2

When excess aqueous ammonia was added to an unknown sample, this was observed. Which cation is present?

• Cu²⁺

• Zn²⁺

• Ca²⁺

• Fe²⁺

Tags

NGSS.HS-PS1-1

NGSS.HS-PS1-2

When excess aqueous ammonia was added to an unknown sample, this was observed. Which cation is present?

• Cu²⁺

• Zn²⁺

• Ca²⁺

• Fe²⁺

When NaOH (aq) was added to an unknown sample, a white precipitate was formed, soluble in excess NaOH (aq), to form a colourless solution. Which cation is present?

• Cu²⁺

• Zn²⁺

• Ca²⁺

• Fe²⁺

Tags

NGSS.HS-PS1-1

When NaOH (aq) was added to an unknown sample, a white precipitate was formed, insoluble in excess NaOH (aq). Which cation is present?

• Cu²⁺

• Zn²⁺

• Ca²⁺

• Fe²⁺

Tags

NGSS.HS-PS1-1

NGSS.HS-PS1-2

When NaOH (aq) was added to an unknown sample, this was observed. Which cation is present?

• Cu²⁺

• Zn²⁺

• Fe²⁺

• Fe³⁺

Tags

NGSS.HS-PS1-1

NGSS.HS-PS1-2

What is the physical state of precipitates?

• Solid

• Liquid

• Gaseous

• Aqueous