Description

Burette 25ml – Class B PTFE Stop Cock (Pyrex)

The Burette 25mL – Class B with a PTFE stopcock is a laboratory instrument primarily used in analytical chemistry for delivering precise volumes of liquid solutions. Here are the full details:

1. Capacity: 25 milliliters (mL) – This indicates the maximum volume of liquid the burette can hold.

2. Class B: This classification refers to the level of accuracy and precision of the burette. Class B burettes have a tolerance level that is less stringent compared to Class A burettes. They are suitable for general laboratory use where high precision is not critical.

3. Material:

• Burette Tube: Made of Pyrex glass – Pyrex is a type of borosilicate glass known for its durability, resistance to heat, and chemical inertness.
• Stopcock: Made of PTFE (Polytetrafluoroethylene) – PTFE is a synthetic polymer known for its non-stick properties, chemical resistance, and low friction coefficient, making it ideal for controlling the flow of liquids in laboratory settings.

4. Graduations: The burette tube is graduated with markings indicating volume increments. The markings are typically in milliliters (mL) and may be subdivided into smaller increments (e.g., 0.1 mL or 0.2 mL) depending on the specific design.

5. Accuracy: Class B burettes have a specified tolerance level for accuracy, usually within ±0.10 mL for a 25 mL burette.

6. Usage: Burettes are commonly used in titration experiments where precise volume measurements of a titrant (a solution of known concentration) are required to determine the concentration of an analyte (the substance being analyzed) in a solution.

7. Features:

• The PTFE stopcock provides smooth and precise control over the flow of liquid.
• The burette may have a straight or curved design, with a reservoir at the top for filling the burette with the liquid to be dispensed.
• Some burettes come with a support stand or clamp for secure mounting during use.
• Class B burettes typically meet international standards for accuracy and quality assurance.

8. Maintenance: Burettes should be cleaned thoroughly after each use to prevent contamination and ensure accurate measurements. Regular inspection and calibration may also be necessary to maintain accuracy over time.

Overall, the Burette 25mL – Class B with a PTFE stopcock is a reliable and essential tool for precise volumetric measurements in analytical chemistry laboratories.