Chemistry Lab Techniques Quiz
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Questions and Answers

What is the result of adding ammonia water to AgCl?

  • It turns black
  • It forms a white precipitate (correct)
  • It remains unchanged
  • It dissolves completely

How does the presence of metallic mercury manifest?

  • It remains colorless
  • It forms white precipitates
  • It turns gray upon acidification
  • It turns black in color (correct)

What signifies the presence of Hg2Cl2 in the reaction?

  • Yellow precipitate
  • No precipitate formed
  • Gray precipitate
  • White precipitate (correct)

Which color does mercurous ions precipitates appear in?

<p>White (C)</p> Signup and view all the answers

Why do all samples show an absence of mercurous ion in the experimental results?

<p>Insufficient complex formation with HgNH2Cl (B)</p> Signup and view all the answers

What is the color of the precipitate formed when lead (II) ion reacts with potassium chromate?

<p>Yellow (A)</p> Signup and view all the answers

Which unknown samples showed yellow precipitations in the experimental results?

<p>Unknown samples 2 and 3 (D)</p> Signup and view all the answers

What is the separating agent used to separate silver and mercurous ion in the analysis procedure?

<p>Dilute ammonia (D)</p> Signup and view all the answers

What is the color of the precipitate formed when silver ion reacts with nitric acid?

<p>White (C)</p> Signup and view all the answers

How is silver chloride separated from mercurous chloride based on their solubility?

<p>Silver chloride is soluble in ammonia (B)</p> Signup and view all the answers

What does the efficiency of separation of silver ions from mercurous ions depend on?

<p>Concentration of ammonia (A)</p> Signup and view all the answers

What is the main purpose of the group precipitation procedure in the given text?

<p>Separating cations based on their solubility in water (B)</p> Signup and view all the answers

Why is it important to use colorless solutions instead of clear solutions in the given procedures?

<p>To prevent confusion during identification tests for cations (A)</p> Signup and view all the answers

Which of the following cation groups becomes insoluble when they form chlorides according to the text?

<p>Lead, silver, and mercury (D)</p> Signup and view all the answers

Why is it mentioned in the text that lead chloride may remain as a white residue after leaching with hot water?

<p>Due to poor separation from mercurous chloride and silver chloride (B)</p> Signup and view all the answers

What characteristic of lead chloride makes its separation and identification challenging in the procedures described?

<p>Partial separation from mercurous chloride and silver chloride (D)</p> Signup and view all the answers

Why does lead chloride have high solubility in water?

<p>For easy dissolution when heated with hot water (B)</p> Signup and view all the answers

What is the purpose of the lab described in the text?

<p>To identify ions in known and unknown mixtures of Group I cations (D)</p> Signup and view all the answers

How is the solubility product constant (Ksp) defined?

<p>As the equilibrium between a solid and its respective ions in a solution (A)</p> Signup and view all the answers

How does the Ksp value relate to solubility?

<p>Higher Ksp indicates higher solubility (A)</p> Signup and view all the answers

What does the comparison of lead chloride to silver chloride and mercurous chloride solubilities reveal?

<p>Lead chloride is less soluble than silver chloride and mercurous chloride (D)</p> Signup and view all the answers

Why is examination as to color limited in determining the solution's identity?

<p>Because certain colors may neutralize each other (A)</p> Signup and view all the answers

Why are good organizational skills and techniques considered essential in this lab?

<p>To ensure correct results are obtained (D)</p> Signup and view all the answers

What is the purpose of keeping a 'waste' beaker near the work area?

<p>To discard all solutions locally (A)</p> Signup and view all the answers

How can cross-contamination affect lab results?

<p>It can cause false observations and incorrect conclusions (D)</p> Signup and view all the answers

What is the recommended method to clean glassware between uses?

<p>Thoroughly rinse with deionized water (A)</p> Signup and view all the answers

How is the pH of a solution tested using litmus paper?

<p>By contacting a stirring rod with litmus paper touched to the solution (D)</p> Signup and view all the answers

Which of these may indicate a positive test according to the text?

<p>Formation of precipitate or residue (B)</p> Signup and view all the answers

What does 'centrifugate/supernatant' refer to in the context provided?

<p>The liquid after mixture (D)</p> Signup and view all the answers

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