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Ionic Equilibrium question

2021 · 26 Aug · Shift 1 · Q8
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  5. /2021 · 26 Aug · Shift 1 · Q8

Ionic Equilibrium question

2021 · 26 Aug · Shift 1 · Q8

JEE MainChemistryIonic EquilibriumMCQ+4 / −1
Given below are two statements. Statement I : In the titration between strong acid and weak base methyl orange is suitable as an indicator. Statement II : For titration of acetic acid with NaOH phenolphthalein is not a suitable indicator. In the light of the above statements, choose the most appropriate answer from the options given below :
  1. A
    Statement I is false but Statement II is true
  2. B
    Statement I is true but Statement II is false
  3. C
    Both Statement I and Statement II are true
  4. D
    Both Statement I and Statement II are false
View written solutionFree

Correct answer: B

  1. Analyze Statement I

    Statement I: In the titration between strong acid and weak base methyl orange is suitable as an indicator.

    • In a strong acid–weak base titration, the equivalence point lies in the acidic range because the salt formed undergoes hydrolysis to give an acidic solution.
    • Therefore, the indicator should change color in the acidic pH region.
    • Methyl orange changes color approximately in the range pH 3.1\text{pH } 3.1pH 3.1 to 4.44.44.4, which is suitable for such titrations.

    Hence, Statement I is true.

  2. Analyze Statement II

    Statement II: For titration of acetic acid with NaOH phenolphthalein is not a suitable indicator.

    • Acetic acid is a weak acid and NaOH is a strong base.
    • In a weak acid–strong base titration, the equivalence point lies in the basic range (generally around pH 8\text{pH } 8pH 8 to 999).
    • Phenolphthalein changes color in the range pH 8.3\text{pH } 8.3pH 8.3 to 10.010.010.0, so it is actually suitable for this titration.

    Therefore, the statement saying phenolphthalein is not suitable is false.

    Hence, Statement II is false.

  3. Choose the correct option

    • Statement I: True
    • Statement II: False

    So the correct option is:

    B: Statement I is true but Statement II is false

  4. Comparison with stored answer

    • Derived answer: B
    • Stored correct answer: B

    They match.

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