1. A volumetric pipet is stamped by the manufacturer with “TD 25 10 mL”. Explain what this means.
It means "To Deliver". When used the pipet still will have some liquid inside at the end. You do NOT blow that out because it has been calibrated To Deliver th 25 mL and leave some behind.
Sometimes the pipet is market "TC". That means "to contain". So a 25 mL pipet marked TC means that you touch the tip of the pipet to the inside of the transfer vessel and when it stops delivering, there will be a small amount left tip of the pipet. You gently blow out the last bit at the bottom in the pipet.
The marking "TD 25 10 mL" on a volumetric pipet indicates the specifications and intended use of the pipet. Here is the breakdown of each element:
1. "TD" stands for "To Deliver" - This means that the pipet is designed to deliver the specified volume of liquid accurately. In other words, if you fill the pipet up to its calibrated marking, it should dispense the entire volume when emptied.
2. "25" represents the tolerance or accuracy of the pipet. The number 25 indicates the maximum permitted error in microliters (µL). It means that when used correctly, the pipet's actual delivered volume can deviate by up to ±25 µL from the indicated volume. This value indicates a level of precision for the pipet.
3. "10 mL" refers to the total volume capacity of the pipet, measured in milliliters. This means that the pipet can hold a maximum volume of 10 milliliters.
In summary, the marking "TD 25 10 mL" on the volumetric pipet indicates that it is designed to deliver an accurate volume of liquid, has a maximum permitted error of ±25 µL, and has a total capacity of 10 milliliters.
The information stamped on the volumetric pipet "TD 25 10 mL" provides important details about its characteristics. Let's break it down:
1. "TD" stands for "To Deliver." This indicates that the pipet is designed to deliver the specified volume of liquid accurately when used correctly.
2. "25" refers to the temperature at which the pipet was calibrated. In this case, it means the calibration was performed at 25 degrees Celsius.
3. "10 mL" denotes the nominal volume of the pipet. It indicates that the pipet has a capacity of 10 milliliters, which is the maximum amount it can hold.
This information is crucial because it helps ensure that the pipet is used correctly for accurate measurements.