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Acid-Base Titration Experiment

Interactive Virtual Titration - Determine Unknown Acid Concentration

Step 1 of 8

Virtual Titration Setup

Burette Control

50.00
40.00
30.00
20.00
10.00
0.00
42.50
Drop Rate: Closed
HCl
Conical Flask
25.00 mL HCl (unknown conc.)
+ 3 drops phenolphthalein

Real-time Monitoring

pH: 2.15
Temperature: 25.3°C
Color Indicator
Acidic (Colorless)
Volume Added
7.50 mL
Titration Status: In Progress

Step-by-Step Progress

1. Equipment Setup
Completed
2. Prepare Solutions
Completed
3. Begin Titration
In Progress
4. Monitor pH Changes
Pending
5. Identify Endpoint
Pending
6. Record Final Reading
Pending
7. Repeat Trials
Pending
8. Calculate Results
Pending

Current Instructions

Step 3: Begin Titration

Slowly add NaOH solution from the burette to the HCl solution while monitoring the pH. Watch for color changes as you approach the endpoint.

Data Recording Forms

Trial Number
1
Initial Reading (mL)
Final Reading (mL)

Calculation Tools

Molarity Calculation

M₁V₁ = M₂V₂ (at equivalence point)

Results Summary

Unknown HCl Concentration: 0.0300 M
Average of Trials: 0.0300 M
Standard Deviation: ±0.0002 M
Percent Error: 1.2%

Statistical Analysis

Number of Trials: 1
Precision: Excellent
Accuracy: Good

Color Change Visualization

Phenolphthalein Indicator Transitions

Acidic
pH < 8.2
Colorless
Endpoint
pH ≈ 8.2
Faint Pink
Basic
pH > 10.0
Deep Pink
Endpoint Detection Tips
  • • The first permanent faint pink color indicates the endpoint
  • • Color should persist for at least 30 seconds
  • • Swirl gently to ensure complete mixing
  • • Add NaOH drop by drop near the endpoint

Safety Checkpoints

Safety Status: Active
Procedure Reminders
  • • Never add water to concentrated solutions
  • • Always read burette at eye level
  • • Record readings to 0.01 mL precision
  • • Rinse equipment between trials
  • • Dispose of solutions properly
Emergency Procedures
Skin Contact: Flush with water for 15 minutes
Eye Contact: Use eyewash station immediately
Spill: Neutralize and clean up properly