29 Questions
What is the result of adding ammonia water to AgCl?
It forms a white precipitate
How does the presence of metallic mercury manifest?
It turns black in color
What signifies the presence of Hg2Cl2 in the reaction?
White precipitate
Which color does mercurous ions precipitates appear in?
White
Why do all samples show an absence of mercurous ion in the experimental results?
Insufficient complex formation with HgNH2Cl
What is the color of the precipitate formed when lead (II) ion reacts with potassium chromate?
Yellow
Which unknown samples showed yellow precipitations in the experimental results?
Unknown samples 2 and 3
What is the separating agent used to separate silver and mercurous ion in the analysis procedure?
Dilute ammonia
What is the color of the precipitate formed when silver ion reacts with nitric acid?
White
How is silver chloride separated from mercurous chloride based on their solubility?
Silver chloride is soluble in ammonia
What does the efficiency of separation of silver ions from mercurous ions depend on?
Concentration of ammonia
What is the main purpose of the group precipitation procedure in the given text?
Separating cations based on their solubility in water
Why is it important to use colorless solutions instead of clear solutions in the given procedures?
To prevent confusion during identification tests for cations
Which of the following cation groups becomes insoluble when they form chlorides according to the text?
Lead, silver, and mercury
Why is it mentioned in the text that lead chloride may remain as a white residue after leaching with hot water?
Due to poor separation from mercurous chloride and silver chloride
What characteristic of lead chloride makes its separation and identification challenging in the procedures described?
Partial separation from mercurous chloride and silver chloride
Why does lead chloride have high solubility in water?
For easy dissolution when heated with hot water
What is the purpose of the lab described in the text?
To identify ions in known and unknown mixtures of Group I cations
How is the solubility product constant (Ksp) defined?
As the equilibrium between a solid and its respective ions in a solution
How does the Ksp value relate to solubility?
Higher Ksp indicates higher solubility
What does the comparison of lead chloride to silver chloride and mercurous chloride solubilities reveal?
Lead chloride is less soluble than silver chloride and mercurous chloride
Why is examination as to color limited in determining the solution's identity?
Because certain colors may neutralize each other
Why are good organizational skills and techniques considered essential in this lab?
To ensure correct results are obtained
What is the purpose of keeping a 'waste' beaker near the work area?
To discard all solutions locally
How can cross-contamination affect lab results?
It can cause false observations and incorrect conclusions
What is the recommended method to clean glassware between uses?
Thoroughly rinse with deionized water
How is the pH of a solution tested using litmus paper?
By contacting a stirring rod with litmus paper touched to the solution
Which of these may indicate a positive test according to the text?
Formation of precipitate or residue
What does 'centrifugate/supernatant' refer to in the context provided?
The liquid after mixture
Test your knowledge on chemistry lab techniques with this quiz. Learn about clear and colorless solutions, group precipitation, and the separation of different chloride compounds using various procedures.
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