Worksheet: Identifying Salts

In this worksheet, we will practice identifying salts from combinations of flame and precipitation tests and predicting the outcome of these experiments.

Q1:

A white salt is soluble in water and reacts with hydrochloric acid to produce a colorless gas. When barium chloride is added to a solution of the salt in water, a white solid precipitates. In a flame test, the salt produces a red flame.

What is the name of the metallic element in the salt?

  • AStrontium
  • BCalcium
  • CSodium
  • DLithium
  • EPotassium

Give the chemical formula of the anion present in the salt.

  • A C O 3 2
  • B S O 4 3
  • C N O 2
  • D N O 3
  • E C l

Q2:

A white salt is soluble in water and produces a red color in a flame test. Addition of silver nitrate to an aqueous solution of the salt results in a yellow precipitate that does not dissolve in concentrated aqueous ammonia. Addition of sodium hydroxide to a solution of the salt has no visible effect, but adding sodium carbonate produces a white precipitate.

Name the anion present in the salt.

  • ANitrate
  • BBromide
  • CSulfate
  • DIodide
  • EAcetate

Give the symbol of the metallic element in the salt.

  • A S r
  • B C a
  • C M g
  • D L i
  • E R b

Q3:

When barium nitrate is added to a solution of an unknown salt, no precipitate is observed. However, the addition of magnesium nitrate causes a white precipitate to form. Which additional material or reagent could be used to confirm the identity of the anion in the solution?

  • ASodium hydroxide
  • BSilver nitrate
  • CBlue litmus paper
  • DRed litmus paper
  • EConcentrated ammonia solution

Q4:

A collection of white salts have been placed separately into unlabeled bottles. It is known that each salt contains ions of cesium, magnesium, or barium combined with nitrate, chloride, sulfate, or carbonate anions. A student identifies each salt by adding five reagents consecutively to a single sample of the material in a test tube, without filtering between tests. After every test, the student records their visual observations as shown in the table.

1. Water 2. Nitric Acid 3. Sodium Hydroxide 4. Nitric Acid 5. Silver Nitrate
Cesium Nitrate Colorless solution Colorless solution Colorless solution Colorless solution Colorless solution
Compound A White solid Gas bubbles and colorless solution Colorless solution Colorless solution Colorless solution
Compound B Colorless solution Colorless solution White solid Colorless solution White solid
Compound C White solid White solid White solid White solid White solid

Which compound could be confused with cesium nitrate in these tests?

  • AMagnesium nitrate
  • BCesium chloride
  • CCesium carbonate
  • DBarium nitrate
  • EMagnesium sulfate

What is the name of compound A ?

  • ABarium carbonate
  • BBarium sulfate
  • CMagnesium sulfate
  • DCesium carbonate
  • EMagnesium carbonate

What is the name of compound B ?

  • ACesium sulfate
  • BMagnesium sulfate
  • CMagnesium chloride
  • DCesium nitrate
  • EBarium chloride

What is the name of compound C ?

  • ABarium sulfate
  • BMagnesium sulfate
  • CMagnesium chloride
  • DBarium carbonate
  • EMagnesium carbonate

Q5:

A student adds magnesium nitrate and barium nitrate to three cesium salts A–C in an aqueous solution. The student records the visual observations from these tests in a table, as shown.

Salt Magnesium Nitrate Barium Nitrate
A White precipitate White precipitate
B Colorless solution White precipitate
C White precipitate Colorless solution

What is the name of the anion in salt A?

  • AHydroxide
  • BNitrate
  • CSulfate
  • DCarbonate
  • EChloride

What is the name of the anion in salt B?

  • ASulfate
  • BChloride
  • CCarbonate
  • DNitrate
  • EHydroxide

What is the name of the anion in salt C?

  • ASulfate
  • BCarbonate
  • CHydroxide
  • DNitrate
  • EChloride

Which of the cesium salts would react with nitric acid?

  • AA and C
  • BB and C
  • CB only
  • DA only
  • EC only

Q6:

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.

Observation Precipitate Gas Test with a Lit Splint Gas Test with Limewater
1 White Popping sound No change
2 None Extinguishes flame Cloudy solution
3 None Intensifies flame No change
4 White Extinguishes flame Cloudy solution
5 None Popping sound No change

Which set of observations would be made if X B a C O = 3 and Y H S O = 2 4 ?

Which set of observations would be made if X R b = and Y N a C l = ?

For X M g = and X B a = , a solution of compound Y produces different sets of observations. Which of the following is a possible formula for compound Y ?

  • A C u C l 2
  • B A l ( N O ) 3 3
  • C L i S O 2 4
  • D H B r
  • E N a C O 2 3

Q7:

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 Salt A g N O 3 P b ( N O ) 3 2 M g ( N O ) 3 2 B a ( N O ) 3 2
1 White solid White solid Solution Solution
2 White solid White solid White solid White solid
3 Yellow solid Yellow solid Solution Solution
4 Solution White solid Solution White solid
5 Brown solid White solid White solid Solution

Which sodium salts contain halide ions?

  • A4 only
  • B3 only
  • C2 and 5
  • D1 and 3
  • E1 and 4

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

  • A2 and 5
  • B2 only
  • C1, 3, and 5
  • D1 and 4
  • E4 only

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

Which sodium salt has the smallest molar mass?

Q8:

Which of the following pairs of compounds would not react in water to produce a colored precipitate?

  • A A g N O + N a B r 3
  • B C u C l + Z n 2
  • C F e ( N O ) + N a O H 3 3
  • D C u S O + M g B r 4 2
  • E P b ( N O ) + M g I 3 2 2

Q9:

A salt produces a green color in a flame test. In aqueous solution, the salt reacts with a number of other compounds, as shown.

C uSO 4 A P b(NO 3 ) 2 A gNO 3

What is the name of the metallic element in the salt?

  • AIron
  • BCopper
  • CStrontium
  • DBarium
  • ERubidium

What is the name of the anion in the salt?

  • ABromide
  • BNitrate
  • CIodide
  • DChloride
  • ECarbonate

If sodium hydroxide is added to the salt solution before the reaction with C u S O 4 , a different result is obtained. Which of the following images, most accurately, represents the outcome of this reaction?

  • A
  • B
  • C
  • D
  • E

Q10:

A metallic element reacts slowly with water to form a dilute colorless solution, which is tested as shown. In which of the test tubes A, B, and C would a precipitate be observed?

L itmus Paper F lame Test M etal C olorless Gas A B C N aOH H 2 SO 4 N a 2 CO 3 H 2 O
  • ANone of the test tubes
  • BA, B, and C
  • CA and B
  • DB and C
  • EB only

Q11:

A metallic element reacts to form soluble salts when added to hydrochloric, nitric, or sulfuric acids. When sodium hydroxide is added to solutions of these salts, a white solid precipitates.

What is the symbol of the metallic element?

  • A C a
  • B N a
  • C L i
  • D M g
  • E B a

If a salt of the metallic element were analyzed using a flame test, what color of flame would be observed?

  • ANo color
  • BRed
  • CGreen
  • DLilac
  • EYellow

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