milliliters

## What measurements are for volume?

The SI unit of volume is the cubic meter (m 3 ), which is the volume occupied by a cube that measures 1 m on each side. This very large volume is not very convenient for typical use in a chemistry laboratory. A liter (L) is the volume of a cube that measures 10 cm (1 dm) on each side.

## What tool measures metric mass?

When measuring the weight or mass of a small object, you can use a scale or a balance. You can use a scale to measure milligrams, centigrams, grams, and small numbers of kilograms. When measuring small amounts of capacity, you can use a graduated cylinder. Graduated cylinders can measure milliliters and centiliters.

## What is used in measuring the volume of liquid?

Liquid volume is usually measured using either a graduated cylinder or a buret. Graduated cylinders come in a range of sizes, or volume capacities, and much like a measuring cup, volume is measured by adding liquid to the cylinder and comparing the liquid level to the graduated scale.

## How do you calculate volume in mL?

The units of mass (weight) in the metric system are kilograms and grams. Once you know both the density and the mass, divide the mass by the density to find the volume. If you want to calculate volume in milliliters, measure the weight in grams.

## How do you read the volume of a pipette?

A pipette is calibrated with a series of graduation lines to allow the measurement of more than one volume. Measure using the bottom of the concave surface of the liquid in pipette….A label to indicate the size and measurement graduations of the pipette such as:

1. 10 mL in 1/10.
2. 5 mL in 1/10.
3. 1 mL in 1/100.

## What is a burette measured in?

Burets are commonly constructed of a long tube of glass calibrated and marked in units of mL. A stopcock (valve) is used to control the flow of the liquid from the stopcock. A 50 mL buret normally will have calibrated volume markings starting with the zero mark at the top of the buret and the 50 mL mark at the bottom.

## Why do we use a burette?

A burette is used to dispense small volumes of liquid called aliquots, or sometimes gas, with high accuracy. It consists of a long glass tube with a valve at one end to control the flow of liquid. Burettes serve essentially the same purpose as a pipette.

## Is burette or pipette more precise?

Compared to a volumetric pipette, a burette has similar precision if used to its full capacity, but as it is usually used to deliver less than its full capacity, a burette is slightly less precise than a pipette.

## Which pipette is most precise?

volumetric pipette

## How precise is a pipette?

A pipette is accurate to the degree that the volume delivered is equal to the specified volume. Many scientific studies involve either dilutions made with pipettes, or the addition of very small volumes of liquid to an experiment.

## How can you tell if a pipette is dirty?

One sure sign that glassware is dirty is the formation of water droplets on the inside wall of the glassware. If after cleaning with soap, water and a brush, water droplets form you probably did not clean the glassware well enough and should repeat the washing until no droplets form when rinsed with distilled water.

## What is the largest source of pipetting problems?

Human error is the largest source of pipetting problems, followed by liquids sticking to the tips, and loss of accuracy when working with viscous liquids (multi-option select question, chart depicts the percent of survey respondents who experienced these various pipetting errors).

## Why should not use wet pipette?

Failure to Pre-Wet Pipette Tip If pipette operators do not pre-wet the pipette tip prior to initial delivery, sample volume can be lost due to evaporation within the tip.

## How do you calculate a pipette error?

Calculate the accuracy of the pipette. To calculate the accuracy you can use the equation A = 100 x Vavg/V0, where A is the accuracy of the pipette, Vavg is the average calculated volume and V0 is the value you set the pipette to dispense. Accuracy should be between 99-101%.

## How do you calculate pipette precision?

To calculate the accuracy you can use the equation A = 100 x Vavg/V0, where A is the accuracy of the pipette, Vavg is the average calculated volume and V0 is the value you set the pipette to dispense. Accuracy should be between 99-101%.

## What is the uncertainty of a 10 ml pipette?

Capacity Tolerances for Class A Volumetric Glassware. A 10-ml pipet is listed as 10.00 0.02, which is close enough to 4 significant figures, 10.00 ml. But a 1-ml pipet is listed as 1.000 0.006, which is really only 3 significant figures, 1.00 ml.