Direct Analysis and Double Indicator Method Quiz
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Questions and Answers

What indicator is used to detect the end point in the neutralization reaction involving NaOH?

  • Litmus
  • Bromothymol blue
  • Methyl orange
  • Phenolphthalein (correct)
  • In the two-step neutralization reaction for CO3-2 like Na2CO3, what is the indicator used at the phenolphthalein end point?

  • Litmus
  • Bromothymol blue
  • Phenolphthalein (correct)
  • Methyl orange
  • Why is a double-indicator method used for the analysis of compatible base mixtures?

  • To detect multiple end points accurately (correct)
  • To make the reaction faster
  • To reach different end points for each base
  • To confuse the titration process
  • What laboratory data is typically available for titration analysis using the double-indicator method?

    <p>W sample weight</p> Signup and view all the answers

    In a titration using phenolphthalein and methyl orange, what color change indicates the phenolphthalein end point?

    <p>Pinkish to colorless</p> Signup and view all the answers

    If a sample solution turns colorless after adding 25.6 mL of 0.5324 M HCl with phenolphthalein as an indicator, what additional volume of acid is needed for the color to change to pink with methyl orange?

    <p>0.3 mL</p> Signup and view all the answers

    What is the appropriate indicator for a strong base with a weak acid?

    <p>Methyl Red (pH: 4.2 - 6.2)</p> Signup and view all the answers

    What is the pH range at the equivalence point for a weak base with a strong acid?

    <p>Less than 7.0</p> Signup and view all the answers

    What is the main characteristic of the titration curve at the equivalence point for weak acid with weak base?

    <p>No inflection region</p> Signup and view all the answers

    In titration analysis under neutralization methods, what is the purpose of using appropriate indicators?

    <p>To visualize the endpoint</p> Signup and view all the answers

    What is the significance of the titer-value in titration analysis?

    <p>To compute the weight of analyte directly from volume reading</p> Signup and view all the answers

    What method involves titrating analyte directly with a standard solution using an appropriate indicator?

    <p>Direct analysis</p> Signup and view all the answers

    What is the main purpose of direct analysis in titration?

    <p>To analyze samples where the analyte readily reacts with the standard solution</p> Signup and view all the answers

    Which indicator is commonly used in direct analysis for the analysis of % Acetic Acid in vinegar?

    <p>Methyl orange</p> Signup and view all the answers

    When is the double-indicator method applied in titration?

    <p>In mixtures where components do not react with each other</p> Signup and view all the answers

    What is the significance of using two indicators in the double-indicator method?

    <p>To indicate the endpoint more accurately</p> Signup and view all the answers

    In the direct analysis of % Na2CO3 in soda ash sample, what is considered as the analyte?

    <p>% Na2CO3</p> Signup and view all the answers

    Why are OH- and HCO3- considered incompatible mixtures for double-indicator method applications?

    <p>Because they react with each other</p> Signup and view all the answers

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