Qualitative Analysis of Cations

which of the following ions will produce white precipitate and soluble in excess aqueous sodium hydroxide solution?

• Mg²⁺

• Ca²⁺

• Fe³⁺

• Al³⁺

What is the chemical formula for the cations that may be present in the salt?

• A

• B

• C

• D

Sodium hydroxide and ammonia were added to an unknown substance X. The results are as shown. Name the cation present.

What is the purpose of qualitative analysis?

• To determine the mass or concentration of the given sample

• To measure the melting point of the given sample

• To identify the components of the given sample

Sodium hydroxide (aq) was added in excess to test tubes A, B and C which contain different salts.

The cations present are

• iron(II), copper(II) and zinc

• iron(III), copper(II) and calcium

• iron(II), lead(II) and ammonium

• iron(II), copper(II) and calcium

Tags

NGSS.HS-PS1-2

Name the precipitate in A.

Tags

NGSS.MS-PS1-2

Name the precipitate in B.

Tags

NGSS.MS-PS1-2

Dilute nitric acid was added to an unknown salt, followed by aqueous silver nitrate. The result is as seen in test tube A. Name the precipitate formed.

Tags

NGSS.HS-PS1-7

Dilute hydrochloric acid is added to an unknown salt, followed by barium chloride. Name the white ppt formed.

Tags

NGSS.HS-PS1-3

Which cations are responsible for the yellow, red and apple-green colors produced in a flame test?

• lithium, calcium, barium

• sodium, potassium, copper

• sodium, calcium, copper

• sodium, calcium, barium