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Questions and Answers
What observation indicates the potential presence of an ammonium ion during the jest for ammonium ion?
What observation indicates the potential presence of an ammonium ion during the jest for ammonium ion?
- Sublimation on heating
- Moist red litmus paper turns blue (correct)
- No colour change in flame
- Precipitate formation
Sublimation on heating a substance in a dry test tube confirms that the substance is definitely an ammonium salt.
Sublimation on heating a substance in a dry test tube confirms that the substance is definitely an ammonium salt.
False (B)
What is the role of concentrated hydrochloric acid in the flame test?
What is the role of concentrated hydrochloric acid in the flame test?
To enhance the visibility of flame color changes.
During the action of heat, if a substance sublimes, it may contain an ______ ion.
During the action of heat, if a substance sublimes, it may contain an ______ ion.
Match the following observations with their inferences in tests for cations:
Match the following observations with their inferences in tests for cations:
What is the observation when a small quantity of a substance is heated in a dry test tube?
What is the observation when a small quantity of a substance is heated in a dry test tube?
A proper color of flame is obtained when conducting a flame test for basic radicals.
A proper color of flame is obtained when conducting a flame test for basic radicals.
What is the inference when a chalky white precipitate is obtained after adding sodium hydroxide solution?
What is the inference when a chalky white precipitate is obtained after adding sodium hydroxide solution?
The test that involves using platinum wire is called the ________ test.
The test that involves using platinum wire is called the ________ test.
Match the following actions with their respective observations:
Match the following actions with their respective observations:
What does it indicate if moist red litmus paper does not turn blue after adding sodium hydroxide?
What does it indicate if moist red litmus paper does not turn blue after adding sodium hydroxide?
The presence of dense white fumes is an indication of ammonium ions in a solution.
The presence of dense white fumes is an indication of ammonium ions in a solution.
What is the purpose of the flame test in the identification of cations?
What is the purpose of the flame test in the identification of cations?
What chemical is used to test for ammonium ions?
What chemical is used to test for ammonium ions?
The presence of ammonium ion is confirmed if a dense white fume is produced in contact with a glass rod dipped in concentrated hydrochloric acid.
The presence of ammonium ion is confirmed if a dense white fume is produced in contact with a glass rod dipped in concentrated hydrochloric acid.
What is observed when sodium hydroxide is added to a solution containing an ammonium ion?
What is observed when sodium hydroxide is added to a solution containing an ammonium ion?
No proper color of flame is obtained, indicating that the substance does not contain _______.
No proper color of flame is obtained, indicating that the substance does not contain _______.
Which of the following indicates that ammonium ion is not present in the solution?
Which of the following indicates that ammonium ion is not present in the solution?
Heating a substance in a dry test tube can lead to the identification of basic radicals.
Heating a substance in a dry test tube can lead to the identification of basic radicals.
What is the significance of a red litmus paper not turning blue when testing for ammonium ions?
What is the significance of a red litmus paper not turning blue when testing for ammonium ions?
Flashcards
Ammonium ion test
Ammonium ion test
A test to identify the presence of ammonium ions in a given substance.
Sublimation
Sublimation
Substance changes from solid to gas directly without going through the liquid phase.
Dry test tube
Dry test tube
A laboratory apparatus used for heating small quantities of substances
Flame test
Flame test
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Ammonium ion
Ammonium ion
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Dry test for cations
Dry test for cations
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Heat test for cations
Heat test for cations
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Sodium Hydroxide
Sodium Hydroxide
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Platinum wire
Platinum wire
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No Ammonium ion Present
No Ammonium ion Present
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Chalky white precipitate
Chalky white precipitate
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Dry test
Dry test
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Gelatinous white precipitate
Gelatinous white precipitate
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Red litmus paper does not turn blue
Red litmus paper does not turn blue
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Dense white fumes
Dense white fumes
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What happens when you add sodium hydroxide to a solution containing ammonium ion?
What happens when you add sodium hydroxide to a solution containing ammonium ion?
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Why is the absence of dense white fumes important in the ammonium ion test?
Why is the absence of dense white fumes important in the ammonium ion test?
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Study Notes
Experiment Number - 2
- Aim: Identification of basic radical or cation in a given compound.
- Apparatus: Test tube, test tube holder, test tube stand, Bunsen burner, platinum wire, dropper.
- Chemicals: Concentrated hydrochloric acid, sodium hydroxide, ammonium hydroxide.
- Physical Characteristics of the unknown substance: Blue crystalline solid, odourless, soluble in water.
Dry Test for Basic Radicals
- Experiment 1 (Action of Heat): Small quantity of the substance is placed in a dry test tube and heated gently.
- Observation: Blue color turns to white; fumes are evolved that condense into liquid droplets.
- Inference: Possibly hydrated substance.
Flame Test
- Experiment (Flame test): Small quantity of the substance is applied to a flame using a platinum loop and concentrated hydrochloric acid.
- Observation and Inference: Blue-ish green flame indicates the presence of copper ion.
Test for Ammonium Ion
- Experiment: To the salt solution, a small amount of sodium hydroxide solution is added and heated gently.
- Observation and Inference: Pale blue precipitate is formed. Red litmus paper does not change color. No dense white fumes are observed when dipped in concentrated hydrochloric acid. Therefore ammonium ion is absent.
Experiment Number - 3
- Aim: Identification of basic radical or cation in an unknown compound.
- Apparatus: Test tube, test tube holder, test tube stand, Bunsen burner, dropper, platinum wire.
- Chemicals: Concentrated hydrochloric acid, sodium hydroxide, ammonium hydroxide.
Physical Characteristics of the substance
- Colour: Pale white.
- State: Amorphous solid.
- Odour: Odourless.
- Solubility: Insoluble in water.
Dry Test for Basic Radicals
- Experiment (Action of heat): A small quantity of the substance is placed in a dry test tube and heated gently.
- Observation: The substance changes to a brown color.
- Inference: Potential presence of a ferrous ion.
Experiment Number - 4
- Aim: Identification of basic radicals or cations in an unknown compound.
- Apparatus: Test tube, test tube holder, test tube stand, Bunsen burner, dropper, platinum wire.
- Chemicals: Concentrated hydrochloric acid, sodium hydroxide, ammonium hydroxide.
Physical Characteristics of the Substance
- Colour: Pale white.
- State: Crystalline solid.
- Odour: Odourless.
- Solubility: Soluble in water.
Dry Test for Basic Radicals
- Experiment (Action of heat): A small quantity of the substance is heated in a dry test tube.
- Observation: Sublimation of the substance is observed.
- Inference: Possible presence of ammonium ion.
Flame Test
- Experiment (Flame Test): A small quantity of the substance is added to a flame using a platinum loop and concentrated hydrochloric acid.
- Observation and Inference: No visible color change/flame is observed, indicating absence of ammonium ion.
Wet Test for Ammonium Ion
- Experiment: To the salt solution, a few drops of sodium hydroxide solution are added and gently heated.
- Observation and Inference: No precipitate is observed, confirming the absence of ammonium ion.
Experiment Number - 5
- Aim: Identification of basic radical or cation in an unknown compound.
- Apparatus: Test tube, test tube holder, test tube stand, Bunsen burner, dropper, platinum wire.
- Chemicals: Concentrated hydrochloric acid, sodium hydroxide, ammonium hydroxide.
Physical Characteristics of the Substance
- Colour: White.
- State: Crystalline solid.
- Odour: Odourless.
- Solubility: Soluble in water.
Dry test (Action of Heat):
- Experiment: A small quantity of the substance is heated in a dry test tube.
- Observation: No specific observation.
- Inference: No clear inference.
Flame Test
- Observation and Inference: No visible flame color, possibly no presence of specific cations.
Wet Test for Ammonium Ion
- Observation and Inference: No precipitate; Ammonium ion is absent.
Experiment Number - 6
- Aim: Identification of basic radicals in an unknown compound.
- Chemicals: Concentrated hydrochloric acid, sodium hydroxide, ammonium hydroxide.
- Apparatus: Test tubes, test tube holder, test tube stand, Bunsen burner, dropper, platinum loop.
- Inference: No specific details on inference.
Experiment Number - 7
- Aim: Identification of acid radicals/anions in an unknown compound.
- Apparatus: Test tubes, test tubes holder, test tube stand, Bunsen burner, dropper.
- Chemicals: Dilute and concentrated hydrochloric, sulfuric acid, other reagents,
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Description
This quiz focuses on identifying basic radicals or cations in a given compound through various tests. It includes observations and inferences drawn from heat action and flame tests, particularly emphasizing the presence of copper ions. Engage with the experiment details and enhance your understanding of chemical analysis.
