Burettes – Precision Liquid Dispensing Instruments
(For Titrations & Volumetric Analysis)
1. Key Components
| Part | Description |
|---|---|
| Graduated Tube | Long cylindrical glass with precision markings (Class A/B tolerance) |
| Stopcock | PTFE or glass valve for flow control |
| Tip | Tapered delivery end for drop-wise dispensing |
| Mounting Clamp | For secure positioning on stands |
2. Technical Specifications
| Parameter | Details |
|---|---|
| Standard Volumes | 10 mL, 25 mL, 50 mL (Also available: 5 mL, 100 mL) |
| Graduation | 0.1 mL increments (50 mL) |
| Accuracy | ±0.05 mL (Class A) |
| Meniscus Reading | Bottom (clear liquids) / Top (dark solutions) |
| Material | Borosilicate glass (3.3) |
3. Types & Selection Guide
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Digital Burettes: Motorized, programmable dispensing
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Microburettes: For <1 mL volumes (0.01 mL gradations)
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Automatic Zeroing: Self-refilling designs
4. Proper Usage Protocol
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Rinsing: Pre-wet with titrant solution
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Filling: Avoid air bubbles (use funnel)
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Reading: Eye level at meniscus
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Delivery: Slow, drop-wise near endpoint
5. Calibration & Maintenance
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Verification: Annual calibration with distilled water
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Cleaning: Chromic acid for stubborn residues
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Storage: Vertical position, stopcock grease applied
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