Chemistry Lab Manual - Strength of Solutions Determination
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Questions and Answers

What is the primary standard substance used in the experiment for determining the normality of NaOH?

  • HOOC-COOH (correct)
  • H2O
  • NaOH
  • Na2CO3

    • Which indicator is used in the titration experiment involving NaOH and HOOC-COOH?

  • Phenolphthalein (correct)
  • Bromothymol blue
  • Methyl red
  • Litmus

    • What is the reaction between NaOH and HOOC-COOH according to the given theory?

  • $HOOC-COOH.2H2O (aq) + NaOH (aq) ightarrow NaOOC-COONa (aq) + H2O$
  • $HOOC-COOH (aq) + NaOH (aq) ightarrow NaOOC-COONa (aq) + H2O$
  • $HOOC-COOH.2H2O (aq) + 2NaOH (aq) ightarrow NaOOC-COONa (aq) + 2 H2O$ (correct)
  • $2HOOC-COOH (aq) + 2NaOH (aq) ightarrow NaOOC-COONa (aq) + 2 H2O$

    • What type of acid is HOOC-COOH?

    <p>Diprotic acid</p> Signup and view all the answers

    What equation represents the theory of titration mentioned in the text?

    <p>$y V_{A}^{A} = x V_{B}^{B}$</p> Signup and view all the answers

    What is the purpose of using phenolphthalein in the titration experiment involving NaOH and HOOC-COOH?

    <p>To indicate the endpoint of the titration by changing color at the equivalence point</p> Signup and view all the answers

    Which substance is a primary standard substance in the titration experiment involving NaOH and HOOC-COOH?

    <p>HOOC-COOH.2H2O</p> Signup and view all the answers

    What is the role of NaOOC-COONa in the titration experiment involving NaOH and HOOC-COOH?

    <p>It forms a complex with HOOC-COOH.2H2O</p> Signup and view all the answers

    Which statement accurately describes the reaction between HOOC-COOH.2H2O and NaOH?

    <p>It results in the formation of NaOOC-COONa and H2O</p> Signup and view all the answers

    Why is HOOC-COOH.2H2O considered a diacidic weak acid in the context of the titration experiment?

    <p>Because it can donate two protons</p> Signup and view all the answers

    What is the purpose of using phenolphthalein in the titration experiment involving NaOH and HOOC-COOH?

    <p>To indicate the equivalence point of the titration by changing color from pink to colorless</p> Signup and view all the answers

    Which substance is a primary standard substance in the titration experiment involving NaOH and HOOC-COOH?

    <p>HOOC-COOH.2H2O</p> Signup and view all the answers

    What is the role of NaOOC-COONa in the titration experiment involving NaOH and HOOC-COOH?

    <p>It neutralizes the excess base</p> Signup and view all the answers

    What equation represents the theory of titration mentioned in the text?

    <p>$y V_{A}S_{A} = x V_{B}S_{B}$</p> Signup and view all the answers

    What is the reaction between NaOH and HOOC-COOH according to the given theory?

    <p>$HOOC-COOH. 2H_{2}O + NaOH → NaOOC-COONa + 2 H_{2}O$</p> Signup and view all the answers

    Study Notes

    Titration Experiment

    • The primary standard substance used in the experiment to determine the normality of NaOH is potassium hydrogen phthalate (KHP).

    Titration Reaction

    • The reaction between NaOH and HOOC-COOH (potassium hydrogen phthalate) is a neutralization reaction.
    • The reaction involves the hydroxide ions (OH-) from NaOH reacting with the hydrogen ions (H+) from HOOC-COOH.

    Indicator and Acid Type

    • Phenolphthalein is the indicator used in the titration experiment involving NaOH and HOOC-COOH.
    • HOOC-COOH (potassium hydrogen phthalate) is a diacidic weak acid.

    Purpose of Phenolphthalein

    • The purpose of using phenolphthalein in the titration experiment is to indicate the endpoint of the reaction, as it turns pink in basic conditions.

    Primary Standard Substance

    • Potassium hydrogen phthalate (KHP) is the primary standard substance in the titration experiment involving NaOH and HOOC-COOH.

    Role of NaOOC-COONa

    • NaOOC-COONa is the salt formed during the reaction between NaOH and HOOC-COOH.

    Titration Equation

    • The equation representing the theory of titration mentioned in the text is: HOOC-COOH + NaOH → NaOOC-COONa + H2O

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    Description

    This quiz covers the determination of the strength of various solutions through standard chemical reactions. Topics include the strength of NaOH and HCl solutions with standard acidic and basic solutions.

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