What is a Glass Burette?
A glass burette is a key volumetric measurement tool for analytical chemistry. For titration, a glass burette can dispense measured samples of a liquid, but more importantly, it can be used to add a titrant in a controlled manner, one drop at a time. When a measurement demands maximum precision, a glass burette can be secured to a retort stand with a burette clamp, leaving the measurement readout unhindered.
Product Types: 1641A vs. 1642A
Choose between two glass burette designs based on your laboratory's needs.
Model 1641A: This model includes a glass tip, glass bead, and a rubber tubed stopcock. It is particularly useful for acid-base titrations.
Model 1642A: This model utilizes a ground glass straight stopcock and is much better for titrants which may be rubber reactive and thus compromise the other model.
Product Specifications (Based on Image Data)
This section shows the technical details of our glass burette offerings for your reference.
| Capacity (ml) | Graduation (ml) | Capacity Tolerance (±ml) | Length (mm) | Available Models |
|---|---|---|---|---|
| 10 | 0.05 | 0.025 | 600 | 1641A / 1642A |
| 25 | 0.1 | 0.05 | 630 | 1641A / 1642A |
| 50 | 0.1 | 0.05 | 860 | 1641A / 1642A |
| 100 | 0.2 | 0.1 | 860 | 1641A / 1642A |
Reading the Burette (How to Read the Burette)
Correct reading of the burette is essential for accurate titration. Follow these steps to ensure the reliability of your data:
Be Level with the Meniscus: To avoid parallax error, ensure that your eyes are level with the liquid meniscus.
Find the Meniscus: If the liquid is clear, find the bottom of the meniscus. If the liquid is dark, find the top of the meniscus.
Pre and Post Titration Readings: Prior to starting the titration, write the initial volume and at the conclusion of the titration, write the final volume. The volume delivered will be the difference.
Allow for Drainage: After performing a titration, allow the film that remains on the inside of the glass burette to drain for 10-15 seconds before taking a final reading.
Common Errors When Using a Burette
Errors are common, even among the most seasoned chemists. If you take note of these errors, you will tremendously increase the quality of your results.
Air Bubbles in the Tip: The most typical error is not clearing air bubbles in the tip before zeroing the burette. These air bubbles can be purged during the titration, which will change the final value.
Incorrect Priming: Liquid that is supposed to be contained in the burette differs from the liquid that is in the burette. This error is caused by a failure to rinse the glass burette with the titrant before filling it.
Incorrect Significant Figures: Recording too many or too few decimal places. An example would be if the burette has a graduation of 0.05 ml, then you would need to estimate to the nearest 0.01 ml (e.g., 22.35 ml, not 22.3 or 22.4).
Over-titrating: Continuing the titration beyond completion results in a higher reading of the final volume. This leads to a final volume calculation that is not accurate.
Application Scope, Characteristics, and Materials
Materials: High-quality Pyrex (or Duran) borosilicate glass, which is chemically inert and highly resistant to thermal shock.
Scope of Application: Widely used for acid-base, redox, (e.g. potassium permanganate), precipitation (e.g. silver nitrate), and complexometric titrations.
Features and Effects: Offers highly accurate volumetric output (Class A tolerances as per the table). The glass surface provides a clearly readable meniscus and smooth control of liquid flow is provided by precision stopcocks.
Why Choose Jiangsu Huida's Burettes?
You cannot afford to compromise precision in your analytics, and neither can you with your equipment. Class A tolerances (e.g. ±0.025ml for the 10ml example) of glass burettes are assured, and analytics in chemistry depend on rigorously precise measurements. Poorly constructed, low cost alternatives are exactly that, while precision ground stopcocks (1642A) and reinforced rubber bead assemblies (1641A) are monumental improvements. In addition, every burette is expertly calibrated prior to dispatch. With Jiangsu Huida, you will obtain highly chemically durable glass labware with exact volumetric delivery, reducing the margin of error in your research. We are a globally trusted manufacturer with a phenomenal price to performance ratio.
Frequently Asked Questions (FAQ)
What are the differences between a burette with a rubber bead (1641A) and a straight stopcock (1642A)?
A: A flexible rubber connection and a glass bead pinch are present in the 1641A series. This is pretty good for the standard acid-base titration and gives you a little feedback with the sense of touch. The 1642A is a glass solid stopcock. This is more resistant to most of the aggressive solvents that will destroy the rubber and will be easier to clean and have a more uniform operation.
What is the proper procedure to cleaning a glass burette between titrations?
A: To clean a burette between titrations, burettes should be rinsed thoroughly with distilled water. Solvents that form a meniscus should be removed with a detergent or cleaning solution, be rinsed again with distilled water, and be rinsed with the titrant prior to use.
3: Do you need a burette clamp for a glass burette?
A: Yes, a burette and a burette clamp should always be used together. A clamp secures a burette to a stand preventing accidental knocks or hand movements. This is necessary when measuring a burette, as any movement will cause the meniscus to alter and disrupt the accuracy.
Post time:2026-05-28
