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#titration

5 public questions tagged with this topic.

CHEMISTRY

The number of moles of I^- oxidized by 1 mole of KMnOâ‚„ in acidic medium to form Iâ‚‚ is:

Given: The number of moles of I^- oxidized by 1 mole of KMnO₄ in acidic medium to form I₂ is: These values define the system as per NCERT data. Formula: 1 mole KMnO₄ oxidizes 5 moles I^- (10/2 = 5).. This is the standard NCERT relation for this phenomenon. Substitution & Calculation: 2MnO₄^- + 16H^+ + 10I^- -> 2Mn^{2+ + 8H₂O + 5I₂ . Result: The computed value matches the expected outcome and confirms the correct choice. Units and powers like J kg⁻¹ K⁻¹, m/s², 10⁻⁵ are properly used as per NCERT.

Ref: NCERT Chemistry Textbook for Class XI and XII, Chapter: Some Basic Concepts, Structure of Atom and Periodicity, Topic: Mole concept, atomic models and periodic trends.

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Isomerism - Stereoisomerism - Geometrical and Optical Isomerism

In Kjeldahl’s method, 0.42 g of a compound produced ammonia that neutralized 15 mL of 0.2 M H₂SO₄. What is the percentag

Moles of H₂SO₄ = 0.015 × 0.2 = 0.003. Moles of NH₃ = 0.006 (2H per H₂SO₄). Mass of N = 0.006 × 14 = 0.084 g. Percentage = (0.084/0.42) × 100 = 20%.

Ref: NCERT Class 11 Chemistry > Chapter 8: Organic Chemistry - Some Basic Principles and Techniques > Topic: Isomerism - Stereoisomerism - Geometrical and Optical Isomerism

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Ionic Equilibrium - Acids Bases and pH and Ionization of Weak Acids Bases

A weak acid HZ ( Ka = 3.2 × 10⁻⁵ ) is mixed with 0.02 M NaOH in a 3:1 volume ratio (acid:base). If the final [HZ] = 0.06

Total volume = 4V, HZ initial = 0.06 × 4V = 0.08 M × 3V , NaOH = 0.02V , [Z-] = (0.02V/4V) = 0.005 M . pH = 4.5 + log (0.005/0.06) = 4.5 - 1.08 = 3.42 .

Ref: NCERT Class 11 Chemistry > Chapter 6: Equilibrium > Topic: Ionic Equilibrium - Acids Bases and pH and Ionization of Weak Acids Bases

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Titration of Amino Acids

What happens when an amino acid is titrated beyond its pI?

It becomes negatively charged correctly describes the effect or change asked about in this question. In Titration of Amino Acids, understanding cause-and-effect relationships is essential for predicting biological outcomes. It becomes negatively charged occurs because of specific molecular interactions, thermodynamic principles, or regulatory mechanisms that govern this biological process. The other options (It becomes positively charged, It remains neutral, and It precipitates) describe either opposite effects, effects that occur under different conditions, or changes associated with unrelated processes.

Ref: Lehninger Principles of Biochemistry, Nelson & Cox, 8th Ed., Ch. 3

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