How do you read volume when a meniscus is present?
A meniscus occurs because of surface tension in the liquid and must be read at eye level. For a concave meniscus, the correct volume will be read at the bottom of the curve. For a convex meniscus, the opposite is true and the correct reading will be at the top of the curve.
When measuring volume in a graduated cylinder The meniscus is?
1. When observing a volume of a liquid in a graduated cylinder, graduated pipette, or buret, read the point on the graduated scale that coincides with the bottom of the curved surface of the liquid. The curved surface of the liquid is called the meniscus.
How do you read volume in a graduated cylinder?
Determine the volume contained in a graduated cylinder by reading the bottom of the meniscus at eye level. Read the volume using all certain digits and one uncertain digit. Certain digits are determined from the calibration marks on the cylinder.
When you read the volume of a liquid in a graduated cylinder above the eye level will you get a lower or higher reading?
Keep in mind that when reading the measurement, you need to keep the graduated cylinder on a level desk, lower your eyes to the level of the meniscus, and you read the volume accordingly. Be sure to include one point of estimation in your reading (see sample reading shown on the left).
When reading a graduated cylinder reading the water level correctly is important Explain what a meniscus is and why it is important when reading a graduated cylinder?
Terms in this set (13) Why does a meniscus occur? When reading a volume in a graduated cylinder, it is also important that your eyes are level so that you are not looking at the meniscus from the top or the bottom. THe graduated cylinder also needs to be on a level table. Thus you will need to bend down to read it.
How do you read a 25 mL graduated cylinder?
In the 25-mL graduated cylinder, first subtract 25 mL – 20 mL = 5 mL. Next, count that ten intervals are between the labeled graduations. Therefore, the scale increment is 5 mL/10 graduations = 0.5 mL/graduation.
How do you use a graduated cylinder?
Steps to reading Graduated Cylinders: The water in a cylinder will form a curve called the meniscus 3. Your eye should be level with the top of the liquid 4. Find the bottom of the curved meniscus in the water. This should be in the center of the graduated cylinder.
When reading the volume of water in a graduated cylinder The volume should be read at the top of the meniscus?
How do you read the meniscus of a graduated cylinder?
The meniscus is formed when the sides of the cylinder pull the water up the sides. This is due to adhesion. Steps to reading Graduated Cylinders: 1. Place the graduated cylinder on a level surface with the measurement lines facing you. 2. The water in a cylinder will form a curve called the meniscus 3.
How do you read a graduated cylinder?
Steps to reading Graduated Cylinders: 1. Place the graduated cylinder on a level surface with the measurement lines facing you. 2. The water in a cylinder will form a curve called the meniscus 3. Your eye should be level with the top of the liquid 4. Find the bottom of the curved meniscus in the water.
How do you measure the volumetric scale of a graduated cylinder?
Follow the lowest point at the surface of the water to the wall of the graduated cylinder. Read the volumetric scale at this point. If you have trouble seeing the meniscus, try holding a black card against the opposite side of the graduated cylinder at the same height as the water.
How should the bottom of the meniscus line up?
The bottom of the meniscus should line up with the cylinder’s calibration lines for an accurate reading. The video shows a 100 ml graduated cylinder in use where the viewing angle is level. This is compared to reading slightly above and below which is wrong.