0
Want this question answered?
Be notified when an answer is posted
Add your answer:
Earn +20 pts
What is the meniscus rule used for?
The meniscus rule states that you always measure the volume of a water-based solution from the bottom of the meniscus when you are using a graduated cylinder.
What happens to the final concentration of H2SO4 if there is an air bubble in the pipette?
Using a pipette with air bubbles leads to errors.
Why is it important to calibrate a pipette prior to it being used to make up standard solution?
Pipettes are used to move specific volumes of fluid between containers. For very small volumes, or very precise applications, a large error in the desired fluid volume can have a very large impact. Calibrating a pipette ensures that the volume desired is the volume collected. Proper sealing of pipette tips can also have a large impact on fluid volumes collected.
When using a graduated cylinder what is the lowest point of the liquid Called?
The meniscus. Make sure to always measure at that point. If your graduated cylinder/pipet/etc has the meniscus at 10 mL then the glassware has 10 mL in it.
Which of the following is important to do in order to get a accurate liquid volume measurment?
If using a graduated cylinder, take into consideration the meniscus, which presents itself as a concave depression on the surface of the liquid in a cylindrical vessel or a convex bulge if such a container is filled to the brim. The height of the meniscus should be divided in half. If you don't have a graduated cylinder, utilize the formula pi times radius squared times the height (don't forget to adjust for the meniscus) of the liquid in a cylinder.
You are using a pipette that has a mark every 0.1 mL. If you want to measure 5.15 mL of liquid using this pipette to what level should you fill the pipette?
The bottom of the meniscus should be halfway between the 5.1-mL mark and the 5.2-mL mark
What is the function of pipette?
The pipette is used to draw up fluids, some like using a straw.
What the function of the pipette?
The pipette is used to draw up fluids, some like using a straw.
What is the meniscus rule used for?
The meniscus rule states that you always measure the volume of a water-based solution from the bottom of the meniscus when you are using a graduated cylinder.
What happens to the final concentration of H2SO4 if there is an air bubble in the pipette?
Using a pipette with air bubbles leads to errors.
How do you transfer any remaining solute into a volumetric flask?
by using a pipette and a suction bulb
When using a graduated cylinder always measure the low spot of the water This is called the?
meniscus
Why is it important to calibrate a pipette prior to it being used to make up standard solution?
Pipettes are used to move specific volumes of fluid between containers. For very small volumes, or very precise applications, a large error in the desired fluid volume can have a very large impact. Calibrating a pipette ensures that the volume desired is the volume collected. Proper sealing of pipette tips can also have a large impact on fluid volumes collected.
What is a pipette safety bulb?
A pipette bulb is the rounded part of a pipette which you squeeze the air out of, then release to draw liquid into the pipette. If you are using a calibrated glass pipette, it will be a separate piece made of rubber which is fitted to the pipette. If it is a simple plastic pipette then the bulb will be made of the same semi-transparent plastic, and the pipette will all be one piece.
When using a graduated cylinder you measure the level of the water from the bottom point of the curve what is it called?
a meniscus
How do you use dropping Pipette?
An Epppendorf pipet is what is called a constant volume pipet. It consists of a barrel with a a push button on one end and a stem on the other. You attach a single use disposable tip to the stem. Some models allow you to set the volume to be dispensed, some are not adjustable. In use, , you depress the push button to the first stop, insert the tip into the liquid to be pipetted, and release the button smoothly to draw up the liquid. Then, transfer the pipet to the receiving vessel and depress the button past the first stop to the second stop, this dispenses the liquid and blows out the last drop to insure accuracy, then discard the tip before the next use. Every time you draw up liquid, you get the exact same volume, with very high precision.
When using a graduated cylinder what is the lowest point of the liquid Called?
The meniscus. Make sure to always measure at that point. If your graduated cylinder/pipet/etc has the meniscus at 10 mL then the glassware has 10 mL in it.
