Identification of Cations

Which of the following chemicals can be used to test for cations?

• Aqueous ammonia

• Ammonium nitrate

• Sodium chloride

• Sodium hydroxide

Aqueous ammonia is the same as

• ammonia

• ammonia solution

• NH₃ (aq)

• NH₃ (g)

What is the correct way to describe this observation?

• clear blue solution

• blue precipitate

• blue water

• blue solution with blue precipitate

Tags

NGSS.MS-PS1-2

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

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

NGSS.HS-PS1-2

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⁺

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

• Cu²⁺

• Zn²⁺

• Fe²⁺

• Fe³⁺

What is the physical state of precipitates?

• Solid

• Liquid

• Gaseous

• Aqueous