Analytical Chemistry Chapter 2A
8 Questions
1 Views

Choose a study mode

Play Quiz
Study Flashcards
Spaced Repetition
Chat to lesson

Podcast

Play an AI-generated podcast conversation about this lesson

Questions and Answers

What is the purity standard that reagent-grade chemicals must conform to?

  • Reagent Chemical Committee of the American Chemical Society (correct)
  • ISO Standards
  • Federal Drug Administration
  • National Institute of Health
  • What is a primary-standard reagent?

    A reagent that has been carefully analyzed by the supplier, with the assay printed on the container label.

    What is the role of the National Institute of Standards and Technology (NIST)?

    To provide primary standards and reference standards.

    Which of the following is NOT a rule for handling reagents and solutions?

    <p>Return excess reagent to the original bottle.</p> Signup and view all the answers

    Why should stoppers of reagent bottles not be set on a desk top?

    <p>To prevent contamination of the reagents.</p> Signup and view all the answers

    The _____ of a reagent is crucial for achieving high standards of analysis.

    <p>purity</p> Signup and view all the answers

    Excess reagent can be safely returned to its original bottle.

    <p>False</p> Signup and view all the answers

    What might information provided with a spectrophotometric solvent include?

    <p>Absorbance at selected wavelengths and ultraviolet cutoff wavelength.</p> Signup and view all the answers

    Study Notes

    Selecting and Handling Reagents and Chemicals

    • Mastery in analytical chemistry enhances performance in chemistry courses and various scientific fields.
    • Skills in analysis bring satisfaction linked to high standards and precise outcomes.

    Importance of Reagent Purity

    • Purity of reagents is crucial for accuracy in analyses; quality must match intended use to ensure reliable results.

    Classifying Chemicals

    • Reagent-Grade Chemicals: Adhere to ACS standards; labeled with impurity limits or actual concentrations; preferred for analytical work.
    • Primary-Standard Grade: Exceptional purity required; supplier provides detailed assays on labels. Standards sourced from the National Institute of Standards and Technology (NIST).
    • Special-Purpose Reagent Chemicals: Designed for specific applications (e.g., spectrophotometry); accompanied by relevant data such as absorbance and UV cutoff wavelengths.

    Handling Reagents and Solutions

    • High-quality chemical analyses depend on the purity of reagents and solutions.
    • Confidence in using chemicals decreases as bottles approach empty unless handled properly.

    Rules for Proper Handling

    • Choose the highest grade of chemical suitable for analytical tasks.
    • Opt for the smallest bottle size needed to prevent excess handling.
    • Immediately reseal containers after use to minimize contamination risks.
    • Hold stoppers between fingers; avoid placing them on surfaces to prevent contamination.
    • Never return excess reagents to original containers to avoid compromising the remaining contents.
    • Avoid direct contact with solid chemicals using utensils; instead, gently shake the bottle or tap to release clumps.

    Studying That Suits You

    Use AI to generate personalized quizzes and flashcards to suit your learning preferences.

    Quiz Team

    Related Documents

    Skoog-FAC, 8e Part 1-42-43 PDF

    Description

    This quiz focuses on the selection and handling of reagents and other chemicals, essential for mastering analytical chemistry tools. Understanding these concepts will enhance your competency in both chemistry courses and related scientific fields. Engage with high standards of analytical practice to achieve accurate and precise results.

    Use Quizgecko on...
    Browser
    Browser