Question

Salt analysis

You are given MAGNESIUM SULPHATE salt. Complete the following observation table.
You need to write a preliminary and a confirmatory test
Experiment Observation Inference
1. Color of the salt was noted White solid MgCO3.
2. Odour of the salt was noted
3. To little of the given salt (solid
– dry salt) add dil. H2SO4
4. To little of the given salt (solid
– dry salt) add conc. H2SO4 and
warm gently
5. Confirmatory test: (Only one)

Write the equation for the reactions involved (only the identified ion)

Result: The anion present in the given salt is: …………………………………………………………………………….

Cation Analysis

Experiment Observation Inference
Flame Test:

Group Analysis
Group 0
Group 1
Group 2
Group 3
Group 4
Group 5
Group 6
Confirmatory Test for cation (Only 1)

Result: The cation in the given salt is: ……………………………………………………………………………
Formula of the given salt is ……………………………………….

Answer 1

Explanation:

Salt analysis

You are given MAGNESIUM SULPHATE salt. Complete the following observation table.

You need to write a preliminary and a confirmatory test

Experiment Observation Inference

1. Color of the salt was noted White solid MgCO3.

2. Odour of the salt was noted

3. To little of the given salt (solid

– dry salt) add dil. H2SO4

4. To little of the given salt (solid

– dry salt) add conc. H2SO4 and

warm gently

5. Confirmatory test: (Only one)

Write the equation for the reactions involved (only the identified ion)

Result: The anion present in the given salt is: …………………………………………………………………………….

Cation Analysis

Experiment Observation Inference

Flame Test:

Group Analysis

Group 0

Group 1

Group 2

Group 3

Group 4

Group 5

Group 6

Confirmatory Test for cation (Only 1)

Result: The cation in the given salt is: ……………………………………………………………………………

Formula of the given salt is ……………………………………….

Answer 2

The cation in the given salt is magnesium (MgSO4). The white precipitate is formed when the Ammonium Oxalate solution is added.

As per the question given,

Experiment Observation Inference

1. The colour of the salt was noted as White solid Magnesium Sulphate
2. The Odour of the salt was noted No particular odour -
3. Too little of the given salt (solid–dry salt) add dil. H2SO4 Effervescence is observed with the evolution of colourless and odourless gas. CO2 gas is evolved. Magnesium Sulphate salt contains carbonate ions.
4. Too little of the given salt (solid – dry salt) add conc. H2SO4 and warm gently No change observed -
5. Confirmatory test: (Only one) Add a few drops of BaCl2 solution to the salt solution. A white precipitate is formed. The anion present in the given salt is: Sulphate ion (SO42-)

Cation Analysis

Experiment Observation Inference

Flame Test: No colour observed -

Group Analysis NaOH test: No ppt. formed - - - - - -

Confirmatory Test for cation (Only 1) Add Ammonium Oxalate solution to the salt solution. A white precipitate is formed. The cation present in the given salt is: Magnesium ion (Mg2+)

The formula of the given salt is MgSO4

Note: In the flame test, since no colour is observed, it can be concluded that the cation does not belong to Group 1 or Group 2. Further tests confirm the presence of Magnesium ion (Mg2+) in the given salt.

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