In qualitative analysis, what does a positive test for the presence of ammonium ions typically involve?
Practice Questions
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Q1
In qualitative analysis, what does a positive test for the presence of ammonium ions typically involve?
Formation of a blue complex
Evolution of ammonia gas
Color change with phenolphthalein
Precipitation with barium sulfate
A positive test for ammonium ions typically involves the evolution of ammonia gas when treated with a strong base, indicating the presence of ammonium.
Questions & Step-by-step Solutions
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Q
Q: In qualitative analysis, what does a positive test for the presence of ammonium ions typically involve?
Solution: A positive test for ammonium ions typically involves the evolution of ammonia gas when treated with a strong base, indicating the presence of ammonium.
Steps: 5
Step 1: Take a sample that you want to test for ammonium ions.
Step 2: Add a strong base, like sodium hydroxide (NaOH), to the sample.
Step 3: Heat the mixture gently. This helps the reaction occur.
Step 4: Observe if ammonia gas is produced. You can test for ammonia by bringing a piece of damp red litmus paper near the gas.
Step 5: If the red litmus paper turns blue, it indicates the presence of ammonia gas, confirming that ammonium ions were present in the sample.
