QQuestionChemistry
QuestionChemistry
I. Arrange the following steps chronologically. Use 1 as the first step, 2 for the second step and so on. Write the number before the letter.
A. Add 4 gtts of K^2CrO^4 into the centrifugate.
B. Place 10 drops of the solution to be analyzed in a test tube.
C. Dissolve the precipitate in 2 drops of concentrated nitric acid.
D. Add 6 - 7 drops of water and heat.
E. Discard the wash water
F. Keep the mixture hot in a steam bath
G. Test for the completeness of precipitation
H. Add 1 - 2 drops of SnCl 2
I. Instill 10 drops of 3F Ammonia
J. Yellow precipitate confirms the presence of Lead ion.
K. Wash the precipitate with 10 drops of cold water
L. White or gray precipitate confirms the presence of mercurous ions.
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Answer
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Step 1:: Place 10 drops of the solution to be analyzed in a test tube.
Step 2:: Add 4 gtts of K^2CrO^4 into the centrifugate.
This will help in the formation of a precipitate.
Step 3:: Dissolve the precipitate in 2 drops of concentrated nitric acid.
This step is necessary to ensure that any mercury(I) nitrate formed is converted back to mercury(I) chloride, which will form a white or gray precipitate in a later step.
Step 4:: Add 6 - 7 drops of water and heat the solution in the test tube.
This step is crucial to facilitate the completion of the precipitation reaction.
Step 5:: Keep the mixture hot in a steam bath.
This will ensure that any remaining mercury(I) chloride is completely precipitated.
Step 6:: Test for the completeness of precipitation.
You can do this by adding 1 - 2 drops of SnCl^2. If the solution turns brown, it indicates the presence of lead ions.
Step 7:: Instill 10 drops of 3F Ammonia.
This will help in the formation of a yellow precipitate if lead ions are present.
Step 8:: Yellow precipitate confirms the presence of Lead ion.
If a yellow precipitate forms, it indicates the presence of lead ions in the solution.
Step 9:: Wash the precipitate with 10 drops of cold water.
This step is necessary to remove any excess reagents and to ensure the purity of the precipitate.
Step 10:: White or gray precipitate confirms the presence of mercurous ions.
If a white or gray precipitate forms, it indicates the presence of mercurous ions in the solution.
Final Answer
1. Place 10 drops of the solution to be analyzed in a test tube. 2. Add 4 gtts of K^2CrO^4 into the centrifugate. 3. Dissolve the precipitate in 2 drops of concentrated nitric acid. 4. Add 6 - 7 drops of water and heat. 5. Keep the mixture hot in a steam bath. 6. Test for the completeness of precipitation. 7. Add 1 - 2 drops of SnCl^2. 8. Instill 10 drops of 3F Ammonia. 9. Yellow precipitate confirms the presence of Lead ion. 10. Wash the precipitate with 10 drops of cold water. 11. White or gray precipitate confirms the presence of mercurous ions.
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