Lesson Worksheet: Identifying Salts Chemistry

In this worksheet, we will practice identifying salts via combinations of qualitative analyses, including flame, precipitation, and reactivity tests.

Q1:

A compound X contains atoms or ions of a metallic element A and a nonmetallic element B. An aqueous solution of X is tested as shown.

What is the symbol of the element A?

  • AAl
  • BRb
  • CSr
  • DMg
  • EFe

What is the symbol of the element B?

  • ACl
  • BI
  • CBr
  • DH
  • EO

What is observed if a piece of copper metal is added to a solution of X?

  • AA grey solid precipitates.
  • BA blue solution forms and a brown solid precipitates.
  • CA blue solution forms and a grey solid precipitates.
  • DA blue solution forms.
  • ENo changes are observed.

What is observed if chlorine water is added to a solution of X?

  • AA brown solution forms, a black solid precipitates, and a purple vapor is evolved.
  • BThe reaction produces a colorless gas, which creates a pop when ignited with a lit splint.
  • CNo changes are observed.
  • DA red-brown solution forms.
  • EThe reaction produces a colorless gas, which can relight a glowing splint.

Q2:

A colorless aqueous solution of a salt is tested as shown.

Give the symbol of the metallic element in the salt.

  • ACu
  • BRb
  • CBa
  • DSr
  • ECs

Give the chemical symbol of the anion in the salt.

  • ACO32
  • BSO42
  • CBr
  • DCl
  • ENO3

Q3:

When a solid material X is added to a dilute aqueous solution Y, an exothermic reaction takes place and a gas is produced. A number of possible observations are shown in the table.

ObservationPrecipitateGas Test with a Lit SplintGas Test with Limewater
1WhitePopping soundNo change
2NoneExtinguishes flameCloudy solution
3NoneIntensifies flameNo change
4WhiteExtinguishes flameCloudy solution
5NonePopping soundNo change

Which set of observations would be made if XBaCO=3 and YHSO=24?

Which set of observations would be made if XRb= and YNaCl=?

For XMg= and XBa=, a solution of compound Y produces different sets of observations. Which of the following is a possible formula for compound Y?

  • AAl(NO)33
  • BLiSO24
  • CCuCl2
  • DHBr
  • ENaCO23

Q4:

Different nitrate salts are added separately to dilute aqueous solutions of five sodium salts. The results of these tests are shown in the table.

Sodium SaltAgNO3Pb(NO)32Mg(NO)32Ba(NO)32
1White solidWhite solidSolutionSolution
2White solidWhite solidWhite solidWhite solid
3Yellow solidYellow solidSolutionSolution
4SolutionWhite solidSolutionWhite solid
5Brown solidWhite solidWhite solidSolution

Which sodium salts contain halide ions?

  • A1 and 3
  • B2 and 5
  • C1 and 4
  • D4 only
  • E3 only

Which sodium salts form aqueous solutions that turn red litmus paper blue?

  • A2 only
  • B1, 3, and 5
  • C4 only
  • D2 and 5
  • E1 and 4

Which sodium salt reacts with nitric acid to produce a colorless gas?

Which sodium salt has the smallest molar mass?

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