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#acid-base

21 public questions tagged with this topic.

CHEMISTRY

What is the pH of a 0.001 M Ba(OH)2 solution, assuming complete dissociation?

Given: What is the pH of a 0.001 M Ba(OH)2 solution, assuming complete dissociation? These values define the system as per NCERT data. Formula: [OH-] = 2 × 0.001 = 0.002 M, pOH = -log(0.002) approx 2.7. This is the standard NCERT relation for this phenomenon. Substitution & Calculation: pH = 14 - 2.7 = 11.3 . 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: Solutions, Topic: Concentration terms and colligative properties.

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CHEMISTRY

What is the pH of a solution with [OH-] = 2.5 × 10⁻² M?

Given: What is the pH of a solution with [OH-] = 2.5 × 10⁻² M? These values define the system as per NCERT data. Formula: pOH = -log(2.5 × 10⁻²) approx 1.6, pH = 14 - 1.6 = 12.4 .. This is the standard NCERT relation for this phenomenon. Substitution & Calculation: Substituting values like 1.2 × 10⁻⁵, 236 J kg⁻¹ K⁻¹, CH₃CH₂NH₂ etc. into the formula and simplifying step by step. 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: Solutions, Topic: Concentration terms and colligative properties.

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CHEMISTRY

What is the pH of a 0.006 M KOH solution, assuming complete dissociation?

Given: What is the pH of a 0.006 M KOH solution, assuming complete dissociation? These values define the system as per NCERT data. Formula: [OH-] = 0.006 M, pOH = -log(0.006) approx 2.22. This is the standard NCERT relation for this phenomenon. Substitution & Calculation: pH = 14 - 2.22 = 11.78 approx 11.8 . 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: Solutions, Topic: Concentration terms and colligative properties.

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CHEMISTRY

The K_a of formic acid ( HCOOH ) is 1.8 × 10⁻⁴. What is the pH of a 0.02 M solution?

Given: The K_a of formic acid ( HCOOH ) is 1.8 × 10⁻⁴. What is the pH of a 0.02 M solution? Formula: K_a = x²/0.02, 1.8 × 10⁻⁴= x²/0.02, x² = 3.6 × 10⁻⁶. Substitution & Calculation: x = √3.6 × 10⁻⁶approx 1.9 × 10⁻³, pH = -log(1.9 × 10⁻³) approx 2.72 . Final Result: The computed value matches expected outcome and confirms correct choice as per latest NCERT 2026-27.

Ref: NCERT Chemistry Textbook - Latest Edition for Academic Session 2026-27 (Rationalized Textbook for Class XI and XII)Topic: Mole concept, atomic structure, chemical formulas like H₂O, CO₂, CH₃CH₂NH₂ and periodic trends.

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CHEMISTRY

The K_a of propanoic acid is 1.32 × 10⁻⁵. What is the pH of a 0.01 M solution?

Given: The K_a of propanoic acid is 1.32 × 10⁻⁵. What is the pH of a 0.01 M solution? These values define the system as per NCERT data. Formula: K_a = x²/0.01, 1.32 × 10⁻⁵= x²/0.01, x² = 1.32 × 10⁻⁷. This is standard NCERT relation. Substitution & Calculation: x = sqrt1.32 × 10⁻⁷approx 3.63 × 10⁻⁴, pH = -log(3.63 × 10⁻⁴) approx 3.44 . Result: The computed value matches expected outcome and confirms correct choice as per NCERT.

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

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CHEMISTRY

Which of the following compounds does not form a salt with HCl ?

Amides like CH₃CONH₂ are neutral and do not form salts with HCl, unlike amines which are basic and protonate to form ammonium salts. This follows from NCERT principle where relation explains outcome clearly for students.

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

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CHEMISTRY

Which species can act as both a Bronsted acid and base?

HCO₃- can donate H+ (acid) or accept H+ (base). This follows from latest NCERT 2026-27 principle explaining the concept clearly for NEET students in simple steps as per rationalized syllabus.

Ref: NCERT Chemistry Textbook - Latest Edition for Academic Session 2026-27 (Rationalized Textbook for Class XI and XII)Topic: Mole concept, atomic structure, chemical formulas like H₂O, CO₂, CH₃CH₂NH₂ and periodic trends.

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CHEMISTRY

Which species can act as both a Bronsted acid and base?

HSOâ‚„- can donate H+ (acid) or accept H+ (base). This follows from NCERT principle where the relation explains the outcome clearly for students in simple steps.

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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CHEMISTRY

Which species is a Lewis acid?

A Lewis acid accepts an electron pair. Fe³+ can accept electron pairs due to its positive charge and incomplete octet. This follows from NCERT principle where the relation explains the outcome clearly for students in simple steps.

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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