Acid-Base Titration & Indicator Virtual Lab

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Acid-Base Titration Virtual Lab

JEE & NEET Simulation Engine

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1. System Configuration

Titration System Strong Acid / Strong Base (HCl vs NaOH) Weak Acid / Strong Base (CH₃COOH vs NaOH) Strong Acid / Weak Base (HCl vs NH₄OH)

Burette (Titrant) NaOH (0.1 M)

Flask (Analyte) HCl (0.1 M, 25 mL)

Select Indicator

Select an indicator to observe the colorimetric endpoint.

Volume Added 0.00 mL

Live pH 1.00

0-

10-

20-

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50-

VALVE

HCl + No Indicator

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2. Live Titration Curve

pH vs V(mL)

Equivalence Pt Reached

Phenol Range (8.2 - 10.0) Methyl Orange (3.1 - 4.4)

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3. Interactive Litmus Station

Test the flask's chemical nature at any point of the titration by dipping a litmus strip to determine if the solution is currently acidic, basic, or neutral.

Observations will be logged here once a test is initiated.

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Equivalence Solver

Solve N₁V₁ = N₂V₂. Leave one field blank to auto-calculate it.

N₁ (Acid)

V₁ (mL)

N₂ (Base)

V₂ (mL)

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JEE/NEET Quiz

Score: 0/5

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📖 Deep Dive: Salt Hydrolysis & Indicator Transition (JEE Advanced Level)

Mathematical Hydrolysis

When a Weak Acid is titrated with a Strong Base, the equivalence point contains only basic salt undergoing anionic hydrolysis:

pH = 7 + ½ pKₐ + ½ log C

For a Strong Acid with a Weak Base, cationic hydrolysis occurs yielding an acidic equivalence point:

pH = 7 - ½ pK_b - ½ log C

Phenolphthalein (8.2 - 10.0)

Phenolphthalein (HPh) is colorless in acidic form and turns deep magenta in basic form (Ph⁻) due to extended resonance conjugation.

• ▹ At pH < 8.2: High concentration of un-ionized [HPh] (Colorless).
• ▹ At pH > 10.0: High concentration of ionized [Ph⁻] (Pink).
• ▹ Perfect for WA vs SB titrations as the pH leaps drastically through the basic range.

Methyl Orange (3.1 - 4.4)

Methyl Orange (MeOH) changes from red in highly acidic media to yellow in less acidic/neutral/basic environments.

• ▹ At pH < 3.1: Exists in quinonoid structure (Red).
• ▹ At pH > 4.4: Exists as azo compound (Yellow).
• ▹ Ideal for SA vs WB titrations, where the pH drops rapidly within the acidic range.

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