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What is the test for the presence of Al3+ ions?
- a)Blue litmus paper turns red
- b)Formation of a green flame
- c)Effervescence with hydrochloric acid
- d)Formation of a white precipitate with sodium hydroxide
Correct answer is option 'D'. Can you explain this answer?
Most Upvoted Answer
What is the test for the presence of Al3+ ions?a)Blue litmus paper tur...
Test for the presence of Al3+ ions:
Formation of a white precipitate with sodium hydroxide.
Explanation:
When Al3+ ions are present in a solution, they can be detected by adding sodium hydroxide (NaOH) to the solution. The following reaction takes place:
Al3+ + 3OH- → Al(OH)3
This reaction results in the formation of a white precipitate of aluminum hydroxide (Al(OH)3). This precipitate is insoluble in water and can be easily observed.
Key Points:
- The test involves adding sodium hydroxide solution to the solution being tested for the presence of Al3+ ions.
- The reaction between Al3+ ions and OH- ions forms a white precipitate of aluminum hydroxide.
- The white precipitate is insoluble in water and can be easily observed.
- This test is specific to Al3+ ions as other metal ions may not form a white precipitate with sodium hydroxide.
- The formation of a white precipitate confirms the presence of Al3+ ions in the solution being tested.
Note: The other options mentioned in the question are incorrect:
a) Blue litmus paper turning red is a test for acids.
b) Formation of a green flame is a test for copper (Cu2+) ions.
c) Effervescence with hydrochloric acid is a test for carbonates and bicarbonates.
d) The correct test for the presence of Al3+ ions is the formation of a white precipitate with sodium hydroxide.
Formation of a white precipitate with sodium hydroxide.
Explanation:
When Al3+ ions are present in a solution, they can be detected by adding sodium hydroxide (NaOH) to the solution. The following reaction takes place:
Al3+ + 3OH- → Al(OH)3
This reaction results in the formation of a white precipitate of aluminum hydroxide (Al(OH)3). This precipitate is insoluble in water and can be easily observed.
Key Points:
- The test involves adding sodium hydroxide solution to the solution being tested for the presence of Al3+ ions.
- The reaction between Al3+ ions and OH- ions forms a white precipitate of aluminum hydroxide.
- The white precipitate is insoluble in water and can be easily observed.
- This test is specific to Al3+ ions as other metal ions may not form a white precipitate with sodium hydroxide.
- The formation of a white precipitate confirms the presence of Al3+ ions in the solution being tested.
Note: The other options mentioned in the question are incorrect:
a) Blue litmus paper turning red is a test for acids.
b) Formation of a green flame is a test for copper (Cu2+) ions.
c) Effervescence with hydrochloric acid is a test for carbonates and bicarbonates.
d) The correct test for the presence of Al3+ ions is the formation of a white precipitate with sodium hydroxide.
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What is the test for the presence of Al3+ ions?a)Blue litmus paper tur...
The test for the presence of Al3+ ions is the formation of a white precipitate with sodium hydroxide.
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What is the test for the presence of Al3+ ions?a)Blue litmus paper turns redb)Formation of a green flamec)Effervescence with hydrochloric acidd)Formation of a white precipitate with sodium hydroxideCorrect answer is option 'D'. Can you explain this answer?
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What is the test for the presence of Al3+ ions?a)Blue litmus paper turns redb)Formation of a green flamec)Effervescence with hydrochloric acidd)Formation of a white precipitate with sodium hydroxideCorrect answer is option 'D'. Can you explain this answer? for JAMB 2025 is part of JAMB preparation. The Question and answers have been prepared according to the JAMB exam syllabus. Information about What is the test for the presence of Al3+ ions?a)Blue litmus paper turns redb)Formation of a green flamec)Effervescence with hydrochloric acidd)Formation of a white precipitate with sodium hydroxideCorrect answer is option 'D'. Can you explain this answer? covers all topics & solutions for JAMB 2025 Exam. Find important definitions, questions, meanings, examples, exercises and tests below for What is the test for the presence of Al3+ ions?a)Blue litmus paper turns redb)Formation of a green flamec)Effervescence with hydrochloric acidd)Formation of a white precipitate with sodium hydroxideCorrect answer is option 'D'. Can you explain this answer?.
What is the test for the presence of Al3+ ions?a)Blue litmus paper turns redb)Formation of a green flamec)Effervescence with hydrochloric acidd)Formation of a white precipitate with sodium hydroxideCorrect answer is option 'D'. Can you explain this answer? for JAMB 2025 is part of JAMB preparation. The Question and answers have been prepared according to the JAMB exam syllabus. Information about What is the test for the presence of Al3+ ions?a)Blue litmus paper turns redb)Formation of a green flamec)Effervescence with hydrochloric acidd)Formation of a white precipitate with sodium hydroxideCorrect answer is option 'D'. Can you explain this answer? covers all topics & solutions for JAMB 2025 Exam. Find important definitions, questions, meanings, examples, exercises and tests below for What is the test for the presence of Al3+ ions?a)Blue litmus paper turns redb)Formation of a green flamec)Effervescence with hydrochloric acidd)Formation of a white precipitate with sodium hydroxideCorrect answer is option 'D'. Can you explain this answer?.
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